Seagate ST3450802SS, ST3600002SS manual Physical/electrical specifications, AC power requirements

7.0Physical/electrical specifications

This section provides information relating to the physical and electrical characteristics of the drive.

7.1AC power requirements

None.

7.2DC power requirements

The voltage and current requirements for a single drive are shown below. Values indicated apply at the drive connector.

Table 12: ST3600002SS DC power requirements

			1.5 Gb mode		3 Gb mode		6 Gb mode
		Notes	(Amps)	(Amps)	(Amps)	(Amps)	(Amps)	(Amps)
Voltage			+5V	+12V [2]	+5V	+12V [2]	+5V	+12V [2]
Regulation		[5]	±5%	±5% [2]	±5%	±5% [2]	±5%	±5% [2]
		[1] [6]	0.35	0.37	0.38	0.36	0.32	0.35
Avg idle current DCX
Maximum starting current
(peak DC) DC	3σ	[3]	0.48	1.81	0.60	1.81	0.48	1.80
(peak AC) AC	3σ	[3]	0.82	3.60	1.02	3.60	0.84	3.71
	3σ
Delayed motor start (max) DC		[1] [4]	0.43	0.04	0.46	0.04	0.45	0.04
Peak operating current:
		[1]	0.38	0.66	0.39	0.65	0.42	0.66
Typical DCX
Maximum DC	3σ	[1]	0.38	0.68	0.40	0.66	0.43	0.67
Maximum (peak) DC	3σ		1.00	2.50	1.02	2.58	1.06	2.46

[1]Measured with average reading DC ammeter or equivalent sampling scope. Instantaneous +12V current peaks will exceed these values. Power supply at nominal voltage. N (number of drives tested) = 6, 35 Degrees C ambient.

[2]For +12 V, a –10% tolerance is allowed during initial spindle start but must return to ±5% before reaching 10,000 RPM. The ±5% must be maintained after the drive signifies that its power-up sequence has been completed and that the drive is able to accept selection by the host initiator.

[3]See +12V current profile in Figure 1.

[4]This condition occurs after OOB and Speed Negotiation completes but before the drive has received the Notify Spinup primitive.

[5]See paragraph 7.2.1, "Conducted noise immunity." Specified voltage tolerance includes ripple, noise, and

20 Cheetah NS 10K.2 SAS Product Manual, Rev. F