4-Pin PWM PC Fan Connector
Standard 4-pin 2.54mm pitch polarized motherboard connector for PC cooling fans featuring Ground, +12V DC power, Tachometer RPM feedback pulse, and 25 kHz PWM speed control.
Aliase:4-Pin Fan, PWM Fan Header, CPU_FAN, Motherboard Fan Header, Molex 47053
4-Pin PWM Fan Header (Motherboard View)
4 Pins
Pinout Table4
| Pin | Signal / Name | Type | Alternative Functions |
|---|---|---|---|
| 1 | GND | Ground | Ground Return Path (Black) |
| 2 | +12V | Power | +12V DC Continuous Power Supply (Yellow) |
| 3 | TACH | Digital | Tachometer Speed Feedback Pulse (Open-collector, 2 pulses/rev) (Green) |
| 4 | PWM | Digital | PWM Fan Speed Control Signal (21-28 kHz Target: 25 kHz) (Blue) |