SATA Data Pinout
7-pin Serial ATA data connector: two differential pairs plus three grounds.
Overview
The SATA data connector is a flat 7-contact connector carrying the high-speed serial link: one transmit pair (A+/A-), one receive pair (B+/B-), and three interleaved grounds for signal integrity. It replaced the wide 40-pin PATA ribbon.
The connector is L-keyed so it only inserts one way. It carries data only - power is supplied through the separate 15-pin SATA power connector.
Pinout
| Pin | Name | Function | Description |
|---|---|---|---|
| 1 | GND | GND | Ground (first-mate) |
| 2 | A+ | PAIR | Transmit differential pair, positive |
| 3 | A- | PAIR | Transmit differential pair, negative |
| 4 | GND | GND | Ground |
| 5 | B- | PAIR | Receive differential pair, negative |
| 6 | B+ | PAIR | Receive differential pair, positive |
| 7 | GND | GND | Ground |
Notes
- A pair is host-to-device (transmit); B pair is device-to-host (receive), relative to the host.
- Grounds (1, 4, 7) bracket each differential pair.
Reference: SATA-IO Serial ATA specification; SATA data pinout· verified 2026-06-27