This two-step mating process avoids glitches to other loads and possible arcing or erosion of the SATA power connector contacts. Finally, the remaining power pins make contact, bypassing the resistances and providing a low-impedance source of each voltage. The drive uses them to charge its internal bypass capacitors through current-limiting resistances. Drive power connector pins 3, 7, and 13 are longer than the others, so they make contact next. ![]() Ground pins 4 and 12 in a hot-swap cable are the longest, so they make contact first when the connectors are mated. Two ground pins, and one pin for each supplied voltage, support hot-plug precharging. To reduce impedance and increase current capability, each voltage is supplied by three pins in parallel, though one pin in each group is intended for precharging.įive parallel pins provide a low-impedance ground connection. The new SATA power connector contains many more pins for several reasons:ģ.3 V is supplied along with the traditional 5 V and 12 V supplies. ![]() And this particular connector shown in the question is missing the 3.3 V (orange) wire. ![]() The connector shown in the image is a 15-pin SATA connector.
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