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24 Barracuda ES.2 SAS Product Manual, Rev. E
[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
7,200 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 2.
Table 3: ST3750630SS DC power requirements
Notes
ST3750630SS
3 Gbit mode
(Amps) (Amps)
Voltage +5V +12V [2]
Regulation [5] ±5% ±5% [2]
Avg idle current DCX
[1] [6] 0.60 0.50
Maximum starting current
(peak DC) DC 3σ [3] 0.90 2.00
(peak AC) AC 3σ [3] 1.10 3.50
Delayed motor start (max) DC 3σ [1] [4] 0.60 0.17
Peak operating current:
Typical DCX
[1] 0.62 0.78
Maximum DC 3σ [1] 0.74 0.82
Maximum (peak) DC 3σ 1.15 1.75
Table 4: ST3500620SS DC power requirements
Notes
3 Gbit mode
(Amps) (Amps)
Voltage +5V +12V [2]
Regulation [5] ±5% ±5% [2]
Avg idle current DCX
[1] [6] 0.60 0.50
Maximum starting current
(peak DC) DC 3σ [3] 0.90 2.00
(peak AC) AC 3σ [3] 1.10 3.50
Delayed motor start (max) DC 3σ [1] [4] 0.60 0.17
Peak operating current:
Typical DCX
[1] 0.62 0.78
Maximum DC 3σ [1] 0.74 0.82
Maximum (peak) DC 3σ 1.15 1.75