HDD and other storage devices connectors
U.2 (SFF-8639) is a computer interface for connecting SSDs to a computer. It is developed for the enterprise market and designed to support new PCI Express drives along with SAS and SATA drives.

U.2 connector is a combination/ extension of the existing SATA and SAS connectors, which offer up to 4x PCIe 3.0 lanes to a connected device. The Enterprise SSD form factor was released on December 20, 2011 by SFFWG, as a mechanism for providing PCI Express connections to SSDs for the enterprise market. Goals included supporting existing 2.5 and 3.5 mechanical enclosures, to be hot swappable and to allow legacy SAS and SATA drives to be mixed using the same connector family.

The U.2 connector is mechanically identical to the SATA Express device plug, but provides four PCI Express lanes through a different usage of available pins. U.2 devices may be connected to an M.2 port using an adapter.

Pin
Number
Pin
Name
Signal
description
Interface
S1 GND Ground  
S2 S0T+ (A+) SAS/SATA/SATAe 0 Tx+ SAS+SATA
S3 S0T- (A-) SAS/SATA/SATAe 0 Tx - SAS+SATA
S4 GND Ground  
S5 S0R- (B-) SAS/SATA/SATAe 0 Rcv - SAS+SATA
S6 S0R+ (B+) SAS/SATA/SATAe 0 Rcv + SAS+SATA
S7 GND Ground  
S8 GND Ground  
S9 S1T+ SAS/SATAe 1 Transmit + SAS+SATA Express
S10 S1T- SAS/SATAe 1 Transmit - SAS+SATA Express
S11 GND Ground  
S12 S1R- SAS/SATAe 1 Receive - SAS+SATA Express
S13 S1R+ SAS/SATAe 1 Receive + SAS+SATA Express
S14 GND Ground  
P1 RSVD(Wake#) / SASAct2 Reserved (WAKE#/OBFF) / SASAct2 SATA Express + SAS x4
P2 sPCIeRst/SAS SATAe Client /SAS reset SATA Express
P3 RSVD(DevSLP#) Reserved (DevSLP#) SATA Express
P4 IfDet# Interface Detect (Was GND-precharge) SATA Express + Enterprise PCIe
P5 GND Ground  
P6 GND Ground  
P7 +5V 5V supply Precharge SAS+SATA
P8 +5V 5V supply SAS+SATA
P9 +5V 5V supply SAS+SATA
P10 PRSNT# Presence (Drive type) all
P11 Activity Activity(output)/Spinup all
P12 GND Hot Plug Ground  
P13 +12V 12V supply Precharge all
P14 +12V 12V supply all
P15 +12v 12V supply all
E1 RefClk1+ ePCIe RefClk + (port B) Dual Port
E2 RefClk1- ePCIe RefClk – (port B) Dual Port
E3 3.3Vaux 3.3V for SM bus Enterprise PCIe opt
E4 ePERst1# ePCIe Reset (port B) Dual Port
E5 ePERst0# ePCIe Reset (port A) Enterprise PCIe opt
E6 RSVD Reserved  
E7 RefClk0+ ePCIe Primary RefClk + Enterprise PCIe
E8 RefClk0- ePCIe Primary RefClk - Enterprise PCIe
E9 GND Ground  
E10 PETp0 ePCIe 0 Transmit + Enterprise PCIe
E11 PETn0 ePCIe 0 Transmit - Enterprise PCIe
E12 GND Ground  
E13 PERn0 ePCIe 0 Receive - Enterprise PCIe
E14 PERp0 ePCIe 0 Receive + Enterprise PCIe
E15 GND Ground  
E16 RSVD Reserved  
E17 RSVD Reserved  
E18 GND Ground  
E19 PETp1/S2T+ ePCIe 1 /SAS 2 Transmit + Enterprise PCIe+SAS x4
E20 PETn1/S2T- ePCIe 1 /SAS 2 Transmit - Enterprise PCIe+SAS x4
E21 GND Ground  
E22 PERn1/S2R- ePCIe 1 /SAS 2 Receive - Enterprise PCIe + SAS x4
E23 PERp1/S2R+ ePCIe 1 /SAS 2 Receive + Enterprise PCIe+ SAS x4
E24 GND Ground  
E25 PETp2/S3T+ ePCIe2 / SAS 3 Transmit + Enterprise PCIe + SAS x4
E26 PETn2/S3T- ePCIe2 / SAS 3 Transmit - Enterprise PCIe + SAS x4
E27 GND Ground  
E28 PERn2/S3R- ePCIe 2 / SAS 3 Receive - Enterprise PCIe + SAS x4
E29 PERp2/S3R+ ePCIe 2 / SAS 3 Receive + Enterprise PCIe + SAS x4
E30 GND Ground  
E31 PETp3 ePCIe 3 Transmit + Enterprise PCIe 
E32 PETn3 ePCIe 3 Transmit - Enterprise PCIe 
E33 GND Ground  
E34 PERn3 ePCIe 3 Receive - Enterprise PCIe 
E35 PERp3 ePCIe 3 Receive + Enterprise PCIe 
E36 GND Ground  
E37 SMClk SM-Bus Clock PCIe opt
E38 SMDat SM-Bus Data PCIe opt
E39 DualPortEn# ePCIe 2x2 Select Dual Port

 

68 pin U.2 (SFF-8639) SATA Express connector layout
68 pin U.2 (SFF-8639) SATA Express connector
According to 1 reports in our database (1 positive and 0 negative) this pinout should be correct.

Is this pinout
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