USB 3 pinouts and signals. Connector types

USB 3.0 is the third major version of the Universal Serial Bus (USB) standard for interfacing computers and electronic devices. USB 3.0 combines USB 2.0 bus and new SuperSpeed bus with transfer rate up to 5.0 Gbit/s, which is about ten times faster than the USB 2.0 standard. USB 3.0 connectors are usually distinguished from their USB 2.0 counterparts by blue color-coding of the receptacles and plugs.

USB 3.1 is the successor standard (USB 3.1 Gen 2), was released in July 2013 with the new transfer mode SuperSpeed+ that can transfer data at up to 10 Gbit/s (1.25 GB/s, twice the rate of USB 3.0).

Communication is full-duplex during SuperSpeed. In the compatibility mode (USB 1.0 or USB 2.0) communication is half-duplex, with direction controlled by the host.

USB 3 (Type A) pinout

Pin	Name	Direction	Color	Description
1	VBUS		red	+5 V power
2	D-	←→	white	USB 2.0 Data -
3	D+	←→	green	USB 2.0 Data +
4	GND		black	Ground
5	StdA_SSRX-	←	blue	SuperSpeed receiver
6	StdA_SSRX+	←	yellow	SuperSpeed receiver
7	GND_DRAIN		ground	Ground
8	StdA_SSTX-	→	purple	SuperSpeed transmitter
9	StdA_SSTX+	→	orange	SuperSpeed transmitter

USB 3 (Type B) pinout

Pin	Name	Direction	Color	Description
1	VBUS		red	+5 V power
2	D-	←→	white	USB 2.0 Data -
3	D+	←→	green	USB 2.0 Data +
4	GND		black	Ground
5	StdB_SSTX-	→	blue	SuperSpeed transmitter
6	StdB_SSTX+	→	yellow	SuperSpeed transmitter
7	GND_DRAIN		ground	Ground
8	StdB_SSRX-	←	purple	SuperSpeed receiver
9	StdB_SSRX+	←	orange	SuperSpeed receiver

USB 3 Micro-B pinout

Pin	Name	Direction	Color	Description
1	VBUS		red	+5 V power
2	D-	←→	white	USB 2.0 Data -
3	D+	←→	green	USB 2.0 Data +
4	ID		any	OTG ID
5	GND		black	Ground
6	StdB_SSTX-	→	blue	SuperSpeed transmitter
7	StdB_SSTX+	→	yellow	SuperSpeed transmitter
8	GND_DRAIN		ground	Ground
9	StdB_SSRX-	←	purple	SuperSpeed receiver
10	StdB_SSRX+	←	orange	SuperSpeed receiver

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