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Cheetah 15K.5 SAS Product Manual, Rev. E
Gen 1.5 data. 0.15A DC and 0.2A AC 12V max start current margin added.
Gen 1.6 data. 0.15A DC and 0.2A AC 12V max start current margin added.
[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
Table 3: ST3146855SS DC power requirements
Notes
ST3146855SS
1.5 Gbit mode
ST3146855SS
3 Gbit mode
(Amps) (Amps) (Amps) (Amps)
Voltage +5V +12V [2] +5V +12V [2]
Regulation [5] ±5% ±5% [2] ±5% ±5% [2]
Avg idle current DCX
[1] [6] 0.76 0.56 0.75 0.56
Maximum starting current
(peak DC) DC 3σ [3] 0.86 1.97 0.86 1.97
(peak AC) AC 3σ [3] 1.17 3.40 1.15 3.34
Delayed motor start (max) DC 3σ [1] [4] 0.67 0.03 0.70 0.03
Peak operating current:
Typical DCX
[1] 0.76 0.88 0.80 0.89
Maximum DC 3σ [1] 0.78 0.91 0.82 0.91
Maximum (peak) DC 3σ 1.54 2.48 1.58 2.48
Table 4: ST373455SS DC power requirements
Notes
ST373455SS
1.5 Gbit mode
ST373455SS
3 Gbit mode
(Amps) (Amps) (Amps) (Amps)
Voltage +5V +12V [2] +5V +12V [2]
Regulation [5] ±5% ±5% [2] ±5% ±5% [2]
Avg idle current DCX
[1] [6] 0.76 0.43 0.94 0.43
Maximum starting current
(peak DC) DC 3σ [3] 0.81 1.90 0.80 1.90
(peak AC) AC 3σ [3] 1.27 3.18 1.30 3.22
Delayed motor start (max) DC 3σ [1] [4] 0.62 0.03 0.64 0.03
Peak operating current:
Typical DCX
[1] 0.72 0.72 0.76 0.72
Maximum DC 3σ [1] 0.73 0.80 0.76 0.80
Maximum (peak) DC 3σ 1.54 2.34 1.56 2.36