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USB Connector Types: Mini USB Connectors & Pinouts
19 Nov 2018
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
	
	
USB Connector Types: Mini USB Connectors & Pinouts
19 Nov 2018

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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From:  https://www.arrow.com/en/research-and-events/articles/micro-connector-usb-pinout
Micro USB Pinout Explained 19 Nov 2018
	
	

USB cables come with one of five different basic types of USB connector: A, B, 
mini B, micro B, and C. The micro connector comes standard on most non-Apple 
mobile phones and many other portables, though USB-C connectors are slowly 
replacing them in the newest generation of devices.



The USB Standard
The standard micro connector is available only up to the second-generation USB 
standard, though a less common and much wider 3.0 version exists. The 3.0 
version offers:
- Better transfer rates than 2.0, but it’s less practical than the smaller and 
faster USB-C connector.

- Receptacles that can accept older generation cables, but older receptacles 
cannot accept 3.0 cables.

The standard micro connector has five pins in its older generations and ten 
pins in the less common 3.0 generation:


Pin
Name
Cable Color
Function
1 Vcc Red +5V DC
2 D- White Data -
3 D+ Green Data +
4 ID Dark Blue(often) Mode Select
5 Gnd Black Ground
6 USB3 SSTX- Blue SuperSPeed transmit -
7 USB3 SSTX+ Yellow SuperSPeed transmit +
8 Gnd N/A Ground signal return
9 USB3 SSRX- Purple SuperSpeed receive -
10 USB3 SSRX+ Orange rSpeed receive +SSRX+




What is USB OTG?
The fourth pin (mode detect) is also commonly referred to as USB “On-the-Go” or
simply “OTG.” This pin allows devices to switch between host and peripheral 
roles. In a smartphone, for instance, the USB connection might allow the phone 
to perform as a mass storage device when connected to a computer, but as a host
to read data from removable storage. This OTG pin is also what allows devices to
“decide” which will draw power from the other – typically the host will supply 
power to the peripheral, though in some cases the roles may be re-negotiated.



Micro USB Pinout Diagrams
Looking at the micro connector on a cable, all generations have pins numbered 
1-4, ascending, from left to right on the main trapezoid. Third generation 
connectors have pins 6-10, ascending, from left to right, on the added side 
rectangle. You’ll find shielded wires on these connectors, and the data wires 
(positive and negative) are twisted pairs requiring no termination.

Fig 1: USB A and USB Micro B pinout

Pin	Name	Cable Color	Function
1	Vcc	Red	+5V DC
2	D-	White	Data -
3	D+	Green	Data +
4	ID	Dark Blue(often)	Mode Select
5	Gnd	Black	Ground
6	USB3 SSTX-	Blue	SuperSPeed transmit -
7	USB3 SSTX+	Yellow	SuperSPeed transmit +
8	Gnd	N/A	Ground signal return
9	USB3 SSRX-	Purple	SuperSpeed receive -
10	USB3 SSRX+	Orange	rSpeed receive +SSRX+

USB Cables

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.

Pin	Signal	Colour	Description
1	Vcc	Red	+5V
2	D-	white	Data -
3	D+	Green	Data +
4	Vcc	Black	Ground