Seagate ST9750424AS Serial ATA device plug connector pin definitions, Pin Function Definition

5.2Serial ATA device plug connector pin definitions

Table 7 summarizes the signals on the Serial ATA interface and power connectors.

Table 7:	Serial ATA connector pin definitions
Segment	Pin	Function		Definition
	S1	Ground		2nd mate
	S2	A+		Differential signal pair A from Phy
	S3	A-
	S4	Ground		2nd mate
	S5	B-		Differential signal pair B from Phy
	S6	B+
Signal
	S7	Ground		2nd mate
			Key and spacing separate signal and power segments
	P1	V33		3.3V power
	P2	V33		3.3V power
	P3	V33		3.3V power, pre-charge, 2nd mate
	P4	Ground		1st mate
	P5	Ground		2nd mate
	P6	Ground		2nd mate
	P7	V5		5V power, pre-charge, 2nd mate
Power	P8	V5		5V power
	P9	V5		5V power
	P10	Ground		2nd mate
	P11	Reserved		The pin corresponding to P11 in the backplane receptacle connector is also reserved
				The corresponding pin to be mated with P11 in the power cable receptacle connector
				shall always be grounded
	P12	Ground		1st mate.
	P13	NC		Not connected
	P14	NC		Not connected
	P15	NC		Not connected

1.All pins are in a single row, with a 1.27 mm (0.050”) pitch.

2.The comments on the mating sequence apply to the case of backplane blindmate connector only. In this case, the mating sequences are:

•the ground pins P4 and P12.

•the pre-charge power pins and the other ground pins.

•the signal pins and the rest of the power pins.

3.There are three power pins for each voltage. One pin from each voltage is used for pre-charge when installed in a blind-mate backplane configuration.

4.All used voltage pins (Vx) must be terminated.

Momentus Product Manual, Rev. C 23