AT, ATX, BTX SMPS Connectors, voltages and functions
There are three types of SMPSs. They are AT, ATX, BTX. These three types of SMPSs have different connectors and each wire has different voltages. Here the connectors and its voltages.
AT SMPSs have 12 pin power connector, ATX SMPSs have 20 pin power connector and BTX SMPSs have 24 and 28 pin power connectors. AT power supplies were used in 80’s and from 1996 we use ATX power supplies. Here are the AT, ATX and BTX SMPSs voltages and users.
Smps AT ATX BTX
Red +5v +5v +5v
Yellow +12v +12v +12v
Blue -12v -12v -12v
White -5v -5v -5v
Black 0v 0v 0v
Orange +5v +3.3v +3.3v
Green ---- +5v +5v
Gray or Brown ---- +5v +5v
Purple ---- +5v +5v
Red : it is used for signal sending
Yellow : It is used for motor running
White &Blue: It is used for backward compatibility
Black : It is used for grounding purpose
Orange : It is used for power good signal
Green : It is used for power supply on in ATX
Gray & Brown: It is used for power good signal in ATX
Purple : It is used for auto shutdown in ATX
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