Computer 3 Pin Fan Connector Pinout

The sense pin is used to relay the rotation speed of the fan and the control pin is an open drain or open collector output which requires a pull up to 5 v or 3 3 v in the fan.

Computer 3 pin fan connector pinout.

Three pin molex connector kk family this molex connector is used when connecting a fan to the motherboard or other circuit board. 3 pin connectors are usually used for the smaller chassis fans with lower power consumption while 4 pin connectors are usually used by cpu fans with higher power consumption. It will also have three square holes on the front and three wires entering the back. So these adapters arrived and were much needed.

Typically the motherboard is required to pull the pin up through a resistor with the fan connecting it to ground once or more per revolution. A 3 pin fan connector will be smaller in size than the 4 pin pwm fan connector. 4 pin connectors are usually used by cpu fans with higher power consumption. Chassis and cpu fans may use either 3 pin or 4 pin power connectors.

3 pin connectors are usually used for the smaller chassis fans with lower power consumption. The 3 pin senses fan rpm revolutions per minute. 4 pin connectors are usually used by cpu fans with higher power consumption. Note that chassis and cpu fans may use either 3 pin or 4 pin power connectors.

The image below displaying is the difference between a 4 pin pwm fan connector left and a 3 pin fan connector right. A pwm capable fan is usually connected to a 4 pin connector pinout. When no revolutions are sensed by the system an audio alarm or no system boot will occur warning the user or preventing proccessor overheating and burnout. But after attempting to use them they worked out pitifully.

Chassis and cpu fans may use either 3 pin or 4 pin power connectors. 3 pin connectors are usually used for the smaller chassis fans with lower power consumption. Ground 12 v sense control. The signal wire measures how fast the fan is moving without any controls for the fan s speed.

Fans with three pin connectors must be used on 3 pin cpu fan pinouts. While they look nice and do adapt 4 pin fans to 3 pin outlets esp. Connectors usually used for computer fans are the following. 2 pack sata to 3 pin 4 pin pmw 12v pc case fan power adapter cable 3 pin or 4 pin pwm connector to 15 pin sata computer cooler cooling fan power cable 4 0 out of 5 stars 24 7 59 7.

A three pin connector is basically power 5 12 volt ground and signal. On space constricted fan control hubs the 4 pin connector failed to lock onto the fan s wire leading to the adapter falling off the fan s wire lead.