10 USB Pinout Explained- USB A, B, C(Male and Female)

Universal Serial Bus (USB) is an electronic device that gives us a universal medium for connecting peripherals. It can be a keyboard, printer, speaker, a storage device, or a mobile phone.

With time, USBs have evolved in type, functionality, and efficiency. So, it becomes important to select the best variant from the available types that perfectly suit our purpose. In this article, we will discuss the pinout of different USB ports or Connectors to get a better idea of their structure and connection.

USB Type A and Type B Pinout(Male and Female)

Usb mini a and mini b, usb micro a and micro b, features of usb standard 3, usb type a 3.0 and type b 3.0, micro b 3.0, usb type c 3.0.

The USB pinout can be divided into two parts: USB Connector Pinout and USB port Pinout. The connector here refers to the device that goes into the USB port. For example, wired Mouse is connected to the laptop by inserting its connector into the USB port.

Hence the terms Male version for Connector and Female version for the USB port are tossed.

USB Type-A is used to make a connection with a PC while Type B is used to connect smaller peripherals. In other words, Type A is a downstream connector, while Type B is an upstream connector.

The USB type A has rectangular, while type B has a square-like shape. Both of them have 4 pins. The figure below shows the Pinout of Male and Female versions of both USBs.

USB type A and B pinout

Both these USB types differ in purpose and shape, but their pin connections are the same. Pin 1 is dedicated to the supply and pin 4 is for ground connection. Even pin 2 and 3 take the data input in both these types.

The female port has the PINs in descending order, starting from the right-hand side, while the male connector has them in the reverse order. The table below shows the pinout of both USBs.

Must read: USB 1.0 vs 2.0 – Know the Difference(Speed, Cable length)

USB Mini was the first improvised version of the normal connectors. This version was launched for both Type A and Type B.

It’s a smaller version of Type A and B, which was extensively used with old mobile phones. The Mini B connector is more popular than the Mini A. The figure below shows the pinout of USB Mini B.

USB Mini B pinout

USB Mini B is thinner and more compact than Mini A. Hence it is used for PDAs, digital cameras, etc. Another significant development imposed on Type Mini is that it has an additional pin to support On-the-GO (OTG) connection. Thus it has 5 pins. The pin connections are given in the table below.

USB Micro A and B pinout

USB Micro is thinner and gives a higher data transfer speed than the USB Mini. It is often used for charging portable devices and comes in two shapes. Micro A is rectangular whereas Type Micro B has a camper shape.

The USB Micro also has 5 pins similar to that of the USB Mini, where the additional pin supports OTG connectivity. The table below shows the pinout of Micro-A and B.

USB Standard 3

USB Standard 3 is widely known as the SuperSpeed Mode that brought a revolution in USB manufacturing. The models used in the third generation are highly advanced, offer faster data speed, have a compact design, and are easy to handle.

The Standard 3 models are accepted globally due to the following benefits:

  • It is capable of transferring data with a speed of 5Gbps and above.
  • Since separate unidirectional paths are used to transmit and receive data, it has a larger bandwidth.
  • With predefined power management states, it offers better power management.
  • It allows the devices to notify about the data transfer, thereby improving the bus usage.

Standard 3 connectors come in the same physical configuration but with an additional 5 pins to handle these advancements. It includes additional ground and dedicated pins for transmission and reception which are called super speed connections. ( learn more )

The pinout diagrams of the superspeed versions of different USB types are described in the following section.

As discussed above, the normal Type A and Type B connectors have 4 pins. But the superspeed versions of Standard 3 have 9 pins which are visible in the figure below.

USB superspeed type A and B pinout

The table below shows the pinout of the superspeed versions.

Read in detail: USB 2.0 vs 3.0 vs 3.1 – Know the Differences

USB Micro B superspeed pinout

The superspeed version of Micro USB was introduced to Type B. Apart from the existing structure, the five additional pins are placed as an extension. Thus, it has a wider structure. The pinout of the Superspeed Micro B USB connector is given in the table below.

Type C has been the game-changer among all the USB types. It supports data transmission as well as power delivery. Thus, it has become a universal connector for modern devices.

USB C 3.0 pinout

The major attraction of Type C USB is that it is flippable. The figure above shows the pin connections with their corresponding color. The pin connections at the top and bottom are similar, so we don’t have to bother to insert the connector in the correct direction.

It has an incredible data transfer speed of up to 5Gbps and is capable of replacing Ethernet ports to achieve higher data rates. The connection description is given in the table below.

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Home » Electronics Theory » USB Pinout, Wiring and How It Works

usb wiring connection

USB Pinout, Wiring and How It Works

What is a usb.

The easiest way to connect computer peripherals is through a Universal Serial Bus (USB). The USB is a plug-and-play interface between the PC and the peripherals. The main advantage of USB is that the device can be plugged in or plugged out without the need of restarting the PC

USB is the short form of Universal Serial Bus, a standard port that helps to connect computer peripherals like scanner, printer, digital camera, flash drive and more to the Computer. The USB standard supports the data transfer at the rate of 12 Mbps.

Related Products:  Connectors  |  Connector Other  |  Connector Audio and Video  |  Connector Power  

USB flash drive.

USB specification and bandwidth

Two important aspects are its support capability and total bandwidth. It is capable of supporting 127 devices and has a total bandwidth of 12 Mbit per second which is equal to 1.5 MB per second. Working of a 12 Mbit (full speed device) or a 1.5 Mbit (low speed devices) depends on the total bandwidth of the USB.

USB 2.0 has a maximum signaling rate of 480 Mbit/s and USB 3.0 has a usable data rate of up to 4 Gbit/s (500 MB/s). Who knows what the future reserves?

USB Connections

Each USB device uses the standard A type connector to the USB host or Hub through A type receptacle. The other end of the cable has series B connector which is used to plug into the B type receptacle.

USB A and B connectors.

A connector is used for the upstream connection towards the host and B connector for the downward stream to the USB device. When the device is connected to the PC, it activates the host to recognize it. The PC detects the device and manages a control flow between the device and computer.

PC also manages the data transfer between the device and PC. Once detected, the PC sends data to the USB system software to recognize it which then identify the device and assign an address. This address is used to detect the particular USB device. The software controls the input and output data between the PC and device. If the software fails to assign the address, PC will not detect the device.

USB receptacles.

USB A, B 2.0 and 3.0 Cable Pinout

The USB cable provides four pathways- two power conductors and two twisted signal conductors. The USB device that uses full speed bandwidth devices must have a twisted pair D+ and D- conductors. The data is transferred through the D+ and D- connectors while Vbus and Gnd connectors provide power to the USB device.

USB pinout.

USB A&B male & female pinout

USB 3 pinout diagram.

USB 3 female pinout

USB A Wiring Connection

The USB cable has typically four wires to connect the A type connector

Wire colors and pins

  • Pin 1 (Red): +5V
  • Pin 2 (White): Data –
  • Pin 3 (Green): Data +
  • Pin 4 (Black): GND

USB wiring diagram.

The USB Hub is used to connect many devices to the PC using a single USB connector. The hub can detect the attachment or detachment of devices in each port of the Hub. It also distributes power to all the devices connected to it and also detects low speed and full speed devices.

USB hub.

It has two components – A Hub controller and a Hub repeater. The controller enables the Hub to communicate with the PC for configuration and control of devices attached to it. The repeater has hardware support for reset, suspend and resume signals.

I recommend you to use a hub with an external power supply if you want to connect more than 2 or 3 devices because they will absorb a large amount of current and the USB port cannot provide it by itself.

USB Flash Drive

The most commonly used USB device is the Flash drive the commonly called Pen drive. It is a mass storage device capable of functioning like a hard disk of computer.

Inside a USB flash drive.

article updated and edited by P. Marian on Oct 15, 2014

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' src=

I’m just a 14 year old kid who likes to take things apart and I don’t know what you’re all arguing about.

' src=

I would like to know a PCB design with components for a flash disk which have USB & OTG ports option.

' src=

Thanks for the wiring info! I found mistakes in text books where for argument sake they had the resistor colouring codes mixed up! I did make the correction in the book and told the librarian as this confuse the beginners. So we are just human but before criticising

' src=

I have updated the article with the female USB pinout and USB 3 also and wrote under each image what it represents, maybe you’ll understand now.

' src=

Your USB wire/color image is INCORRECT! D+ and D- should be reversed. Note that this image is one of the first to appear when you Google Image Search for USB pinout!!!

Please accept my apologies, I didn’t read your comment carefully the first time, afterwards saw your comment with the picture (it was pending for approval). I just updated the article with a picture of an USB cable and its (probably) correct wiring connection.

D Mohankumar, the author of this article, is not an active member of this website because he made many mistakes.

' src=

Wow. Let me get this straight.

People come and give you the correct answer in comments so you don’t mislead your readers and anyone else who sees your photo high up in a Google Image search. You tell them they are wrong without doing research to see they are actually correct. They correct you again. You fix the problem and then tell them not to come back any more. Doesn’t seem like you have much professionalism on the journalism side.

How about a response of “Thanks for clearing that up guys, I appreciate your input!”

Bottom line. I’m glad to have informed you to make the change and potentially helped others make the same mistake I made years ago.

If the information is wrong please visit other websites and don’t come here again, ok?

We are referring to THIS image= https://www.electroschematics.com/wp-content/uploads/2010/01/USB-cable-wiring.png

What? LOL are you kidding me?!?! How do you run a website like this with this lack of knowledge. I dare you to find ANY PCB with any USB cable that would work correctly if you followed your colors correctly. Male or Female connectors mean nothing when it comes to the Green and White data lines. Go ahead, google search USB colors and what the D+ and D- lines are on every website in the world besides yours.

Probably you do not know that there 2 types: female and male USBs (like any other connector), that is why you think this is wrong. The one presented in the picture is the male cable (you can see the cable clearly) and the pinout is correct.

Your USB colors have been wrong for years. Just spoke with a buddy who followed your site and he soldered cables on wrong. I bring up Google image search occasionally to see usb colors for green and white and every time I see your image I know to do opposite. change it. I can’t imagine how many people have screwed up cables because of this image.

' src=

Hello Dr.Mohankumar: I know USB is patented and you need to pay even if u want to experiment with the USB port even if having educational/non-profit applications. But I was wondering , which is completely legal, I had heard about using USB port with Linux to a pheripheral which can be controlled with those ATMEL USB interface chips (I don’t know the exact family).I’m not sure if they come with a driver, I guess so, but I read (don’t remember where, sorry) that the code registred that appears in ur PC is the atmel chip one. HAve you heat about that??

On the other hand, doing a USB to RS232 interface could be the other way to doing a project of making my own peripheral. But, does it implies driver problems?? How can I now control the USB port here???

Many Thanks

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USB Pinout: The Beginner’s Guide

Nowadays, it’s easy to complete projects that involve creating a physical connection between a host controller and several other bus-powered devices because of the USB interface.

USB stands for Universal Serial Bus and has since replaced its predecessors (FireWire, RS-232 serial, and even parallel) as the primary interface for connecting a host to a device.

Normally, the architecture of a USB system includes a host controller, USB ports, and a wide variety of devices. Also, there are cases where you can add additional USB network hubs to create a tree connection structure.

However, that’s just the surface of it all.

So, in this article, we’ll explain everything about the USB and give different USB examples for your circuits.

Let’s begin!

USB Flash drive

USB Flash drive

The USB has four shielded wires that work as pins. Two of these wires are for power supply, while the other two are for differential data signal pairs. Check out the table below for the full USB pinout.

How Does a USB Work?

plugging a USB pen drive on a laptop 

plugging a USB pen drive on a laptop 

Like all connectors, all types of USB connectors have male and female types, making sure you connect your devices in the right direction.

It’s essential to make correct USB connections to allow the system to follow the required USB protocol. So, to establish a connection, USB remote devices feature what we call an upstream connection. These remote devices use this upstream connection to connect to a host. 

Now, the hosts also have downstream connections that allow them to connect to the remote devices.

Furthermore, you can’t use upstream and downstream connections interchangeably. This helps you avoid misconnections and makes sure you connect the USB cable only in the right direction. 

It also helps you avoid several issues like illegal loopback connections and connecting a downstream port to another downstream port.

How it really Works

First, a USB device will show its maximum speed by using pull-up resistors to draw the “D+” and “D-” terminals to 3.3V. Now, the host or hub will also use these pull-up resistors to detect when you connect a compound device to its port. Thus, without a pull-up resistor, the USB won’t detect your connected device or if you have a broken device or broken connector .

So, when you plug in an external device for the first time, the host device scans it and loads the correct driver version required to run the device. To do this, the host uses a product ID/vendor ID (PID/VID)—which the connected hardware or device supplies. Once the host completes the loading of necessary device drivers, the hardware/device will be ready for use. 

Note: USB host controllers have their specifications. We have the Universal Host Controller Interface (UHCI), which works for all USB types, the Open Host Controller Interface (OHCI), which works with USB 1.1, and the Enhanced Host Controller Interface (EHCI), which works with USB 2.0.

USB Connector Types

Originally, the USB cable could only be one of two types, and these two types included “Type A” and “Type B”. Afterward, we got the USB C type, which boasted a better data transfer speed with a more robust system.

Check out the table below for the full overview of the different USB types.

usb a pin assignment

Type-A USB Connector Pinout

Type-A USB is the most popular type of USB connector. Plus, you can find them on host controllers, computers, flash drives, and several other items. Also, you can only make downstream connections with the Type-A USB as its sole use is for controllers and hubs.

Flash Drive

Flash Drive

Type-A USB connectors are bigger than other connectors and have flat and rectangular shapes. Plus, friction holds this connector in place, making it easy to connect and disconnect. However, using it in areas where your equipment might vibrate isn’t a great idea.

The Type-A USB has two versions: Male and female versions. The male version is the plug, while the female version is what we know as the socket or port.

Female connector versions are what we find on host controllers, while male connector versions are usually on devices like memory sticks, keyboards, mice, and other connections to storage devices.


  • Works in most personal computers.
  • Also works in television and music systems.
  • You can also find them on gaming consoles and almost all chargers for mobile portable devices.

Type-A USB Pinout

The older versions of the Type-A connector have four pins, while the newer versions have nine pins. Here’s a table showing all the pins of the Type-A connector.

usb a pin assignment

Note: all generations of the Type-A USB connector have pins 1 to 4 while third-generation connectors have pins 5-9.

USB-B Pinout

The USB-B is the second connector type that mostly works for connecting peripherals like printers and scanners. Plus, their pinouts have a different arrangement.

It has an almost square shape with a slight bevel at the top end corners of the connector. Also, it uses friction to remain in place when connected.

The Type-B USB port is an upstream connector that you can only find on peripheral devices. Thus, most Type-B USB applications require A to B USB cables.

Here’s an interesting fact:

Type-B USB canceled out the chances of creating a connection between two host computers. Thus, helping to prevent damages.

This connector mainly works for peripherals like printers and scanners.

Like the Type-A USB, the older versions of Type-B have four pins, while the newer 3.0 versions have nine pins. Here’s a table showing all the pins:

usb a pin assignment

Also, there is a second type of Type-B connector that has two extra pins:

Source: Wikimedia Commons

USB-C Connector

The USB Type-C is the USB specification that’s slowly replacing the USB-B. It’s a tiny 24-pin reversible plug that works for USB cabling and devices.

Type-C USBs can serve as connectors for both hosts and devices. Plus, you can find Type-C USBs in most recent mobile devices.

USB-C Connector Pinout

The Type-C USB has 24 pins which you can connect reversibly. Here’s a table showing the full list of pins:

usb a pin assignment

Micro USB Pinout

A smaller connector became necessary as the technology required smaller USB sizes for many items like modern mobile phones and audio devices. Thus, the USB Microcontroller was born.

The micro USB has both Type-A and Type-B USB versions available, like the 1.0 micro-USB and 2.0 micro-USB. However, these versions are smaller, and you can use them for much thinner lines of equipment.

Additionally, the micro USB is the USB standard and offers better transfer rates from an external source.

Standard older micro USB connectors have five pins, while the less common 3.0 version has ten pins. Here’s a table showing the pins of the micro USB connector:

usb a pin assignment

The fourth pin mode is what we call the USB on-the-go (OTG). It allows you to switch between the peripheral and host roles on your devices. It’s also what enables devices to decide which will act as a power source once connected. For instance, plugging an android phone into a laptop. The laptop will charge the phone if you have a charge-only cable, not the phone charging the laptop.

Wrapping Up

It’s worth mentioning that sometimes, it’s possible to use USB A to USB A cables to establish connections between a computer or USB device to another USB device with an A-style female port. So you can transfer data between both systems. 


However, you shouldn’t use the type A to A cable connection to create connections between two computers or a USB hub and two computers. Why? Well, creating such a connection would mean the cable would receive equal amounts of voltage (5V) from both computers. Thus, connecting both power supplies and causing irreparable damage and other issues. Sometimes, it may even cause a fire hazard. 

Well, that wraps up this article. Feel free to reach us if you have any questions, and we’ll be happy to help.

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USB Connector Types: Mini USB Connectors & Pinouts

USB cables come with five different basic types of USB connector : types A, B, micro B, mini B, and C. The mini connector is common on older non-Apple mobile phones and other portables. However, the USB micro has largely replaced the mini in recent years, and USB-C may soon replace the micro.

USB cables come with five different basic types of  USB connector : types A , B , micro B , mini B , and C . The mini connector is common on older non-Apple mobile phones and other portables. However, the USB micro has largely replaced the mini in recent years, and USB-C may soon replace the micro.

The mini connector is compatible with the first and second-generation USB standard, but was replaced by micro prior to the development of USB 3.0.

The standard mini USB connector has five pins:

Looking at the mini connector on a cable, pins are numbered 1-4 (X included), ascending, from left to right.  All wires are shielded, and the data wires (positive and negative) are a twisted pair requiring no termination.

Since it’s no longer certified for new devices, the USB mini connector will likely fade from use in the near future. Check out the USB mini B connector pinout below:

Fig 1: Mini USB Type B connector pinout

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USB wiring diagram- Micro USB pinout, 7+ Images

If you are  searching for the USB wiring diagram, you are at the right place. The wiring diagram includes any combination of different types of USB connectors. The most common after USB-type A to USB- type C is “micro USB- type B ” to standard “ USB-type A ” which is generally presents in mobile phone chargers.

micro usb charger wiring diagram internal

USB wiring diagram comes in handy when USB port or connector either of them malfunctions or completely out of order, also for engineers and hobbyist who wants to explore the electronics wiring practically.

These cables breakdown occurs due to excessive use of USB wire (here excessive use means repetitive use of wire or connecting port in a short duration of time). Improper use like rugged applications, inappropriate inserting into port, i.e without checking port orientation.

Another practice is bending the wire greater than 90 degrees , which causes the copper wires in the bundle to get damaged due to its slightly brittle property. Copper is having one of the best malleability and ductility properties. And therefore copper is widely used as a conductor in a wire even having this property, the copper wire undergoes degradation.

Before wiring USB you need to know the pin-out diagram of USB. Below is the figure showing the pin-out diagram of the USB micro-B and USB-A wiring diagram.

Type-A USB pinout diagram, micro USB pinout diagram along with USB wiring diagram:

This cable is most commonly used in mobile charger for charging mobile phones and as a USB data cable to connect mobile devices to tranfer files and images between personal computers and phones.

usb wiring diagram micro usb pinout charger cable

Click here for the USB C 3.0 wiring diagram and charger cable internal wiring.

micro usb b pin out wiring, male USB A pinout wiring diagram

Description : USB wiring is simple but not that simple this is because on changing the frame of reference the pinout looks changed. It can be noticed that pin-out the front side be different than that of back side and thus it requires to check the connectivity of both ends with a digital multi-meter (above micro USB pinout made it simple for you).

Table of male USB-A pinout & USB-B pinout:

The table showing pin number and their nomenclature along with its function in short.

  • Pin no.1 showing the power supply ( +VDD ) through that pin the power is supplied to the device or any equipment which is also an indicator of handshake signal, means “the device is connected”.
  • According to the USB standard power supply is +5V .(but note that the capacity of the power supply is different for different USB versions)
  • Whereas, “ pin no. 2 ” ( -D ) is used as a differential data pin, similarly “ pin no. 3 ” ( +D ) is also used as a differential data pin.
  • The work of the differential data pin is to send and receive the data in a particular format called USB protocol.
  • Pin no. 4 is used as ground. The color code for the wire used in the USB cable red, white, green, grey, black for pin numbers 1, 2, 3, 4 and 5.
  • Please take note of type-A & type-B have the same pinout diagram after arranging on the basis of similarity of shape.

Also check, USB OTG wiring diagram & USB C pin diagram and wiring color code

USB pin-out and its connector:

There are the female connectors for each of the male connectors in practical having the same pin-out as that of the male connector. The most common types of connectors are displayed in this image.

Table of mini and micro USB pin-out type-b & type-a:

The pin-out diagram for the micro USB type-B very similar to USB type-A except for the last two pins 4 and 5 . Also, it is the same for micro USB type-a and micro USB type-b. The pin no.1 is +5V acts as a source to the device or source from the device.

Pin no.2 and pin no.3 are data lines (also called differential data lines because its application varies with the requirements).

The pin no. 4 ( ID ) is used for device identification especially in modern devices for OTG connections. For example, in as a smartphone OTG connector detection to connect a USB drive directly to the mobile phone. And the last pin no. 5 is a connection for ground signal which is pin no. 4 type USB-A through a wire.

How to find the USB wiring diagram manually?

Step1 : First of all find out the type of USB connector used in the cable.

Step2: After the identification of the type of USB connector used on both ends, note down the pinout diagram of that particular USB type.

Step3: Note down all the color of the cable and where it is connected to the actual USB connector on a page. (rough sketch diagram will work)

Step4: Now connect connector pin and wires from the clutter according to the color code and pinout of that particular USB connector on the page using a pen, and your USB wiring diagram is ready.

List of standard USB connectors available commercially in the market which you can buy:

1) USB A male to USB B male. 2) USB A male to USB B female. 3) USB A male to mini USB B male. 4) USB A male to micro USB B male. 5) USB A male to USB C male. 6) USB A female to USB C male. (USB C OTG)  and many more.

Micro USB pinout insight and USB-C:

  • The micro USB connector is most commonly used for charging mobile phones and various other portable devices like Bluetooth headset, Bluetooth speaker, Mini drones, Power Banks.
  • Some of the device manufacturers use their own standard of not connecting the data pin , as the cable is only made to work for charging purposes where only power bus/ wire is required to reduce the manufacturing cost.

You must have had thought of the question, why most of the devices use micro USB?

Most of the devices use micro USB due to the fact that it is compact than all of its precedents in shape and size. And after that, no other type of USB is able to replace it except USB-C ©.

USB-C is more complex micro USB-a than micro USB-b. The micro USB-C is simply called as USB-C.

The image and pinout of micro USB C are as follows:

  • You can see a noticeable difference between USB C and micro USB. As you can observe that USB C can be inserted from any of the orientation. On the contrary, micro USB is direction oriented and we have to give attention while inserting it into the device.
  • In case if USB  C port the Pin no. A1 to A12 is a mirror image of Pin no. B1 to B12. Thus, any functional allocation of pins from A shall be substituted to pins from B.
  • USB C has the advantage of orientation, on the other hand, it has the disadvantage of ring complex on the design level for the programmer and engineers.
  • Apart from this, micro USB comes in three variants (they have principally same micro USB pinout) as shown in the figure.
  • Type-C USB is a new connector system replacing the earlier micro USB. A lot of the new budget smartphones that are released  every few weeks have micro USB C ports, they are becoming more popular in the smartphone and gadget category.
  • These micro USB C cables are available in different assemblies in different USB versions for various purposes, from USB C charging/ data cable to USB C OTG cable. You can check USB C wiring diagrams and internal wirings of USB 3.0/ 3.1.

The image and pinout of USB b super speed are as follows:

The USB b Superspeed pinout is the combination of USB b and 5 auxiliary pins which are predominantly used in high-speed External Hard Drives . The description section of the table above is self-explanatory.

These variants along with USB wiring diagram are decided by the usb.org , which is a ‘USB standards organization’ that maintains USB standards and improvise the USB technology and its applications.

i) micro a ( USB 1.1 to 2): Previously in mobiles, now discontinued. ii) micro b ( USB 1.1 to 2): All current mobiles/ laptops/ desktop PC. iii) micro b ( USB 3.0): External hard drive/latest smartphone/ laptops.

Important things to consider about USB wiring diagram of cables:

usb shielding 5 bare cable usb ID pinout

  • Check that if you are USB cord has more than 4 wires then 5th one must be a bare/ open conductor. This open wire is generally surrounded to the four main wire from around. This arrangement is called as shielding .
  • To prevent external noise shielding is necessary. The most common practice is to ground shielding with the host and external device.
  • Shielding is generally avoided in low quality cheaply made USB cables, which is not in the favor of good quality USB cords. It is very important for the protection of data. Also for avoiding loss of data and hardware faults.

USB color code:

usb color code

Very few people know that the USB connector has a color code. This color code is given to the USB on the basis of its standards defined by its organization. The colors are white, black, blue, red/ yellow.

White : It was introduced in 1996 (now outdated). It has a very low speed. The version it came from is USB 1.XX.

Black : It was in the market since the year 2000. It’s under version USB 2.XX. Its speed is up to 480 Mbps.

Blue : It published under the version USB 3.XX in 2008. Its maximum speed is 5 Gbps.

Red/Yellow : It is very same as USB3.XX with an upgraded feature of “sleep and charge”. This means that your device with this feature will not stop power supply even if the host device is turned off. This is very helpful for charging the mobile phone according to our convenience.

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usb a pin assignment

USB TYPE-C Connector

USB TYPE-C Connector

[Click the image to enlarge it]

USB TYPE-C is a new port designed for high speed data exchange and high power deliver capability. The first thing to realize is that USB TYPE-C is not a new USB standard like USB1.0, USB2.0 , USB3.0, and USB3.1. Those are protocols defining speed and other features, whereas USB TYPE-C is all about physical connection.

USB TYPE-C specification was published by USB Implementers Forum (USB-IF) and was finalized in August 2014. It is a 24 pin USB connector , which is distinguished by its two-fold rotationally-symmetrical connector as shown in above picture.

USB -C connector is designed for replacing USB-A and USB-B connectors. It is also designed for supporting USB3.1 standard fully. It is now poised to become the universal port.

USB Type-C Pin Configuration

As mentioned earlier USB-C is a 24 pin connector and we will describe the each pin below.

The awkward fumble over connecting a pen drive to USB port is finally over with USB-C. The orientation needs to be correct for connecting a pen drive to a USB-A port where as in USB-C port it is not necessary. You can connect devices irrespective of orientation to the USB-C and the port will auto detect the device. So USB TYPE-C is reversible port. Also USB-C is to replace both USB-A and USB-B, so connectivity at both PC and SMART PHONE remains the same. We can connect any end of the cable to PC or SMART PHONE. The issue of connecting correct end of the cable to the PC or MOBILE will be solved permanently with USB-C port.

Features and Electrical Characteristics

  • High data transfer speeds up to 10Gb/s
  • Up to 5Amp current handling capacity
  • Reversible plug orientation and cable direction
  • Small size similar to USB2.0 micro-B
  • Designed to establish future USB performance needs
  • USB-C can replace video ports like VGA and HDMI to provide high quality video output. It can deliver Ultra HD (4K) video for good gaming and movie experience
  • USB-C can also replace audio output or 3.5mm jack to provide high quality audio or music in your smart phone or tablet
  • USB-C can also replace Ethernet port to provide high speed internet up to 1000Mb/s
  • USB-C can also replace SD card port, power port and all other to truly become universal port.
  • Operating temperature: -30ºC to +85ºC

Note: Complete technical details can be found in the USB Type-C Connector Datasheet , linked at the bottom of this page.

Brief About USB TYPE-C

USB-C has become the new trend after its introduction. All the latest Laptops, Notebooks, Smart phones, Peripherals, Tablets and Memory devices are tend to be installed with USB-C. We can see new MACBOOK has only a single USB-C port to replace all other ports. In MACBOOK all the functions are done by that single port. Also GOOGLE CHROME BOOK PIXEL and new smart phones are having USB-C to promote for its application in all other areas.

How to use the USB TYPE-C

As mentioned earlier the features provided by USB-C are many. With so many features in a single port comes with complex management. So we need a port controller for using USB-C port. There are different controllers available in the market like TPS65982, FUSB300C and UPD360.  We have to choose the appropriate controller depending on the requirement. A typical internal circuitry for USB-C is given below.

USB Type C Internal Circuit


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2-D Model and Dimensions

All measurements are in millimeter

USB Type C Dimensions

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Usb-c (type-c) pinout.

usb a pin assignment

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USB type-c details

Developed at roughly the same time as the USB 3.1 specification, but distinct from it, the USB Type-C Specification 1.0 defines a new small reversible-plug connector for USB devices. The Type-C plug connects to both hosts and devices, replacing various Type-B and Type-A connectors and cables with a standard meant to be future-proof, similar to  Apple Lightning and Thunderbolt . The 24-pin double-sided connector provides four power/ground pairs, two differential pairs for USB 2.0 data bus (though only one pair is implemented in a Type-C cable), four pairs for high-speed data bus, two sideband use pins, and two configuration pins for cable orientation detection, dedicated biphase mark code (BMC) configuration data channel, and VCONN +5 V power for active cables. Type-A and Type-B adaptors and cables will be required for older devices in order to plug into Type-C hosts; adaptors and cables with a Type-C receptacle are not allowed.

USB type-C pinout

Pins A2,A3,A10,A11,B2,B3,B10,B11 are not used with USB 2.0-only devices.

User uploaded image:

usb a pin assignment

See also USB type C full-featured cable.

usb a pin assignment

  • USB-C (type-C) full-featured cable pinout
  • USB-C (Type-C) to USB-A charge/data cable pinout
  • USB-C to micro-USB 2.0 cable pinout
  • USB-C to USB 3.2 cable pinout

USB-C (Type-C) diagram

A-85-3A is turbo-piston diesel engine (sometimes named 2A12-3, 12CHN15/16 or 12N360) for front- and rear-positioned engine compartment. A-85-3A engine is used on an Armata universal platform.

The development of the engine was engaged in Chelyabinsk Transdizel design bureau. It produced on Chelyabinsk tractor plant.

A-85-3A (12N360) Engine Specifications:

  • Engine Type: four X - shaped, 12 - cylinder with a turbocharged and intercooled air
  • The system of fuel mixing: direct fuel injection


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