// Data Connectors

NVMe U.2 SFF-8639

U.2 (SFF-8639) is a 68-pin connector for 2.5-inch enterprise NVMe SSDs providing PCIe x4 bandwidth with hot-swap support and on-connector power delivery.

// Specifications

Standard

SFF-8639 NVMe U.2

Lanes

PCIe x4

Speed

Up to 32 Gbps PCIe 3.0 x4

Pin Count

Power

3.3V and 12V on connector

// Pin Reference Table

Pin	Name	Function	Type
1	GND	Ground	GND
2	TX0+	PCIe TX lane 0 positive	BUS
3	TX0-	PCIe TX lane 0 negative	BUS
5	TX1+	PCIe TX lane 1 positive	BUS
6	TX1-	PCIe TX lane 1 negative	BUS
8	TX2+	PCIe TX lane 2 positive	BUS
9	TX2-	PCIe TX lane 2 negative	BUS
11	TX3+	PCIe TX lane 3 positive	BUS
12	TX3-	PCIe TX lane 3 negative	BUS
14	RX0+	PCIe RX lane 0 positive	BUS
15	RX0-	PCIe RX lane 0 negative	BUS
17	RX1+	PCIe RX lane 1 positive	BUS
18	RX1-	PCIe RX lane 1 negative	BUS
55	+3.3V	3.3V power	PWR
63	+12V	12V power	PWR