StarTech.com PEX4SFF8639U3 · Drive adapter

MPN / P/N

PEX4SFF8639U3

Manufacturer designation

U.3 to PCIe Adapter Card, PCIe 4.0 x4 Adapter For 2.5" U.3 NVMe SSDs, SFF-TA-1001 PCI Express Add-in Card for Desktops/Servers, TAA Compliant - OS Independent

Manufacturer conditions

This product is compatible with U.3 drives only. U.2, SAS, and; SATA drives are incompatible.; This product is backwards compatible with PCIe 3.0 slots,; operating at reduced speeds.; NVMe SSDs may require additional drivers, provided by the; manufacturer, or may be natively provided by the operating; system (Windows 8 and later - Mac OS 10.10.3 and later).; Earlier OS versions do not have native NVMe support.

Colour

Red

Material

UL94 - V0

Maximum drive height

0.6 in [15 mm]

Product length

6.1 in [15.4 cm]

Product width

3.5 in [90.0 mm]

Product height

0.1 in [1.5 mm]

Product weight

2.2 oz [62.0 g]

Operating temperature

0C to 60C (32F to 140F)

Storage temperature

-40C to 80C (-40F to 176F)

Humidity

20 ~ 80%

RAID

No

Hot-swap capability — manufacturer conditions

No

MTBF — not warranty duration

21,693,912 Hours

Fans Included? Yes/No

No

Interface

PCI Express x4

Bus type

PCI Express

Number of drives

1

Drive size

2.5in

Compatible drive types

U.3 (PCIe, NVMe, SFF-TA-1001)

Drive installation

Fixed

Supported drive dimensions — source designation

15mm; 12.5mm; 9.5mm; 7mm; 5mm

LED Indicators

1 - Drive Power/Activity Terminal Header; (LEDs not included)

Host Connector 1 (Quantity)

1

Host Connector 1

PCI Express x4

Connector 1 (Quantity)

1

Connector 1

IDC (2-Pin)

Connector 2 (Quantity)

1

Connector 2

U.3 (PCIe, NVMe)

Documented selection limits

Match the exact host interface, peripheral/device protocol, connector, firmware, OS/driver and power requirements before ordering. Published maximum rates are interface limits, not guaranteed application throughput. No universal device or current/future OS compatibility is implied. Match SATA versus PCIe/NVMe, M.2 key/length, PCIe generation/lane width and required bifurcation. A passive adapter cannot add a missing host protocol. Multi-drive/RAID and bootability require the explicitly stated host/firmware support; storage drives are not automatically included.

Specification source: StarTech.com ↗
Checked against documentation: 16.10.2026