![]() In addition, some PSU violate color coding of wires. In several power supply units pin-12 may be Brown (not Blue), pin-18 may be Blue (not White), and pin-8 may be White (not Gray). PS_ON activated by pressing and releasing the power button while the power supply is in standby mode.Īctivating / PS_ON turns on the power supply. 5 VDC (2002 v1.2 made optional, 2004 v2.01 removed from specification) ![]() Short this pin to GND to switch power supply ON, disconnect from GND to switch OFF. +12 VDC (may sometimes have a colored stripe to indicate which rail it "s on) Power Ok is a status signal generated by the power supply to notify the computer that the DC operating voltages are within the ranges required for proper computer operation (+5 VDC when power is Ok)ĥ VDC Standby Voltage (max 10mA) 500mA or more typical ![]() Current version of ATX12V 2.x power supply provides two connectors for the motherboard: a providing additional power to the CPU, and a main, an extension of the original 20-pin version. Originally the motherboard was powered by one 20-pin connector. A −5 V output was originally required because it was supplied on the ISA bus, but it became obsolete with the removal of the ISA bus in modern PCs and has been removed in later versions of the ATX standard. Low-power −12 V (± 1.2 V) and 5 VSB (standby) (± 0.25 V) supplies are also required. * The Molex connector has a lifespan of about 5 years only.The ATX specification requires the power supply to produce three main outputs, +3.3 V (± 0.165 V), +5 V (± 0.25 V) and +12 V (± 0.60 V). Drawbacks associated with the Molex connector * Expensive * May not be widely available * Cumbersome to remove since they do not lock into position using a latch. * They ease repairs since if the connector fails, it can easily be replaced. Benefits of the Molex connector * They make it easier to assemble different components. As computer technology has advanced, so too has the Molex Mini-Fit Jr. This connector can feature twenty or twenty four different pins, depending on the age of the power supply and the motherboard it will connect to. The largest of the Molex connectors on a computer power supply is known as the ATX connector, or the Mini-Fit Jr. One computer can have several Molex connectors. The Molex connectors bring DC power to the drives inside a PC case. The Molex connector is used for power connections for a disk drive in a computer as well as for other computer components such as CD-ROM's, graphic cards etc. The terminal pins on the other hand are what conduct the current. The function of the housing is to hold the terminals and protect them from shorting, dust, dirt, moisture, and electrical interference. The connectors are capable of up to 10 amperes. The connector that provides power has female pins and a male housing while the connector that receives power has male pins and a female housing. COLOR FUNCTION Yellow 12 volts Black Ground Red 5 volts The connector is polarized and designed in a way that makes it difficult to plug it in incorrectly. The wires consist of a yellow wire, two black wires and a red wire. These shells can be arranged to support anywhere from two to fifteen circuits. The pins and the sockets on the ends of a Molex connector are held in place by nylon shells and aligned 5.088 mm apart in a sort of rectangular matrix depending on the application. One piece of the two piece pin and socket design consists of metal pins while the other piece consists of metal sockets. The connector has a nylon plug and receptacle consisting of a two piece pin and socket connection to which four wires are attached. The Molex connector has a very simple design.
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