USB pinout of different types of YUSB connectors: pinout of micro and mini usb contacts + nuances of desoldering

The USB interface is a popular form of technological communication on mobile and other digital devices. Connectors of this kind are often found on personal computers of different configurations, peripheral computer systems, on cell phones, etc.

The peculiarity of the traditional interface - USB pinout small area. For work, only 4 pins (contacts) + 1 grounding shield line are used. True, the latest more advanced modifications (USB 3.0 Powered-B or Type-C) are characterized by an increase in the number of working contacts.

Universal Serial Bus

The abbreviation “USB” bears the abbreviation, which in its integral form reads like “Universal Series Bus” - a universal serial bus, thanks to the use of which high-speed exchange of digital data is carried out.

The versatility of the USB interface is noted:

  • low power consumption;
  • unification of cables and connectors;
  • simple logging of data exchange;
  • high level of functionality;
  • wide support for drivers of different devices.

What is the structure of the USB interface, and what are the types of USB technology connectors in the modern world of electronics? Let's try to figure it out.

Technological structure of USB 2.0 interface

The connectors related to products belonging to the specification 1.x - 2.0 group (created before 2001) are connected to a four-conductor electrical cable, where two conductors are supplying and two more transmitting data.

Also in the specifications 1.x - 2.0, the pinout of the service USB connectors implies the connection of a shielding braid - in fact, the fifth conductor.

USB 2.0 pinout
This is the physical performance of normal USB connectors related to the second specification. The left shows the type of "father", the right shows the type of "mother" and the corresponding pinout for both options

Existing versions of the universal serial bus connectors of the noted specifications are presented in three variants:

  1. Normal- type "A" and "B".
  2. Mini- type "A" and "B".
  3. Micro- type "A" and "B".

The difference of all three types of products lies in the design approach. If the normal connectors are designed for use in stationary technology, the mini and micro connectors are made for use in mobile devices.

Pinout usb mini
This is the physical performance of the second-specification connectors from the “mini” series and, accordingly, the labels for the Mini USB connectors - the so-called pinout, based on which the user performs a cable-connection

Therefore, the last two species are characterized by a miniature version and a slightly modified shape of the connector.

Pinout table of standard connectors of type "A" and "B"

Contact Specification Cable conductor Function
1 Power + Red (orange) + 5V
2 Data - White (gold) Data -
3 Data + Green Data +
4 Food - Black blue) Earth

Along with the performance of mini-A and mini-B connectors, as well as micro-A and micro-B connectors, there are modifications of mini-AB and micro-AB connectors.

A distinctive feature of such structures is the execution of the soldering of YUSB conductors on a 10-pin contact pad. However, in practice, these connectors are rarely used.

Table pinout interface Micro USB and Mini USB connectors type "A" and "B"

Contact Specification Cable conductor Function
1 Power + Red + 5V
2 Data - White Data -
3 Data + Green Data +
4 Identifier Host - device
5 Food - The black Earth

Technological structure of USB 3.x interfaces

Meanwhile, the improvement of digital equipment by the time of 2008 led to the obsolescence of the 1.x - 2.0 specifications.

These types of interface did not allow the connection of new equipment, for example, external hard drives, so that a higher data transfer rate (greater than 480 Mbps) was provided.

Accordingly, a completely different interface has appeared, marked with specification 3.0. The development of the new specification is characterized not only by increased speed, but also gives an increased amperage - 900 mA against 500 mA for USB 2/0.

It is clear that the emergence of such connectors provided service to a larger number of devices, some of which can be powered directly from the universal serial bus interface.

USB 3.x connectors
Modification of USB 3.0 connectors of different types: 1 - performance of “mini” type “B”; 2 - standard product type "A"; 3 - development of the “micro” type “B” series; 4 - Standard execution type "C"

As can be seen in the picture above, the interfaces of the third specification have more working contacts (pins) than the previous one - the second version. Nevertheless, the third version is fully compatible with the "two".

In order to be able to transmit signals at a higher speed, the developers of designs of the third version equipped with an additional four data lines and one line of the zero contact wire. Extended pin pins are located in a separate row.

Table of pin designations of connectors of the third version for wiring USB cable

Contact Execution "A" Execution "B" Micro-b
1 Power + Power + Power +
2 Data - Data - Data -
3 Data + Data + Data +
4 Earth Earth Identifier
5 StdA_SSTX - StdA_SSTX - Earth
6 StdA_SSTX + StdA_SSTX + StdA_SSTX -
9 StdA_SSRX + StdA_SSRX + StdA_SSRX -
10 StdA_SSRX +
11 Shielding Shielding Shielding

Meanwhile, the use of the USB 3.0 interface, in particular the “A” series, was a serious drawback in the design plan. The connector has an asymmetric shape, but it does not specifically indicate the position of the connection.

The developers had to deal with the modernization of the design, as a result of which in 2013, the option USB-C appeared at the disposal of users.

Upgraded version of the USB 3.1 connector

The design of this type of connector implies duplication of the working conductors on both sides of the plug. Also on the interface there are several backup lines.

This type of connector is widely used in modern mobile digital technology.

Pinout USB-C
The location of the contacts (pins) for the interface type USB-C, belonging to a series of the third specification of connectors, intended for communications of various digital equipment

It is worth noting the characteristics of USB Type-C. For example, the speed parameters for this interface show the level - 10 Gbit / s.

The design of the connector is made in a compact design and ensures the symmetry of the connection, allowing the connector to be inserted in any position.

Pinout table conforming to specification 3.1 (USB-C)

Contact Designation Function Contact Designation Function
A1 GND Grounding B1 GND Grounding
A2 SSTXp1 Tx + B2 SSRXp1 Rx +
A3 SSTXn1 Tx - B3 SSRXn1 Rx -
A4 Tire + Power + B4 Tire + Power +
A5 CC1 CFG channel B5 SBU2 PPD
A6 Dp1 USB 2.0 B6 Dn2 USB 2.0
A7 Dn1 USB 2.0 B7 Dp2 USB 2.0
A9 Tire Food B9 Tire Food
A10 SSRXn2 Rx - B10 SSTXn2 Tx -
A11 SSRXp2 Rx + B11 SSTXp2 Tx +
A12 GND Grounding B12 GND Grounding

Next level of USB 3.2 specification

Meanwhile, the process of improving the universal serial bus is actively continuing. At the non-commercial level, the next specification level has already been developed - 3.2.

According to available information, the speed characteristics of the USB 3.2 interface promise twice as big parameters as the previous design can give.

Developers managed to achieve such parameters by introducing multi-band channels through which transmission at 5 and 10 Gbit / s, respectively, takes place.

Universal Serial Bus USB-3.2
Like Thunderbolt, USB 3.2 uses multiple lanes to achieve overall throughput, instead of trying to sync and run one channel twice

By the way, it should be noted that the compatibility of the perspective interface with the already existing USB-C is fully supported, since the “Type-C” connector (as already noted) is endowed with backup contacts (pins) providing multi-band signaling.

Features of cable desoldering on pins

There are no special technological nuances of soldering the cable conductors on the contact pads of the connectors.The main thing in this process is to ensure that the color of the cable conductors matches the specific pin (pin).

USB cable conductor colors
Color marking of conductors inside the cable assembly used for USB interfaces. From top to bottom, the colorization of cable conductors for specifications 2.0, 3.0 and 3.1, respectively, is shown.

Also, if wiring modifications of obsolete versions is carried out, the configuration of connectors, the so-called “father” and “mother”, should be taken into account.

Conductor, sealed on the contact "father" must match the soldering on the contact "mother". Take, for example, the option of cable desoldering on USB 2.0 pins.

The four working conductors used in this version are usually marked with four different colors:

  • red;
  • white;
  • green;
  • black.

Accordingly, each conductor is soldered to a contact pad marked with a connector specification of a similar color. This approach greatly facilitates the work of the electronics engineer, eliminates possible errors in the process of soldering.

Similar soldering technology is applied to connectors from other series. The only difference in such cases is the greater number of conductors that have to be soldered.

Regardless of the connector configuration, screen conductor soldering is always used. This conductor is soldered to the corresponding pin on the connector,Shield - protective shield.

There are frequent cases of ignoring the protective screen, when "experts" do not see the point in this explorer. However, the lack of a screen dramatically reduces the characteristics of the USB cable.

Therefore, it is not surprising that with a considerable cable length without a screen, the user receives problems in the form of interference.

USB power plug
Wiring connector two conductors under the organization of the power line for the donor device. In practice, there are different variants of brawls, based on technical needs.

Unplug the USB cable is allowed by different options, depending on the configuration of the port lines on a particular device.

For example, to connect one device with another in order to obtain only the supply voltage (5V), it is enough to solder only two lines on the corresponding pins (contacts).

Conclusions and useful video on the topic

The video below shows the highlights of the pinouts of the 2.0 series connectors and others, visually explains the individual details of the production of the soldering procedures.

With full information on pinouting universal serial bus connectors, you can always cope with a technical problem with conductor defects. Also, this information is definitely useful if you need to connect any non-standard digital devices.

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