Mosfet Transistor IRF4905

The Mosfet Transistor IRF4905 is a P-channel power MOSFET in a TO-220 package, rated −55 V and −74 A with an on-resistance of only 20 mΩ. As a P-channel device it suits high-side switching, where the load stays connected to ground and the MOSFET switches the positive supply, and reverse polarity protection on 12 V and 24 V power inputs.

Mosfet Transistor IRF4905 Specifications

• Type: P-channel enhancement-mode power MOSFET
• Drain-source voltage (VDSS): −55 V
• Continuous drain current (ID): −74 A at 25 °C case temperature, with a suitable heat sink
• On-resistance (RDS(on)): 20 mΩ max at VGS = −10 V
• Gate-source voltage (VGS): ±20 V max
• Gate threshold voltage: −2 V to −4 V
• Power dissipation: 200 W at 25 °C case temperature
• Package: TO-220AB, pins gate, drain, source (front view, left to right); the metal tab is the drain

Mosfet Transistor IRF4905 Applications

• High-side load switches for 12 V and 24 V systems
• Reverse polarity protection on power inputs
• Upper switches in H-bridge motor drivers, paired with N-channel MOSFETs
• Battery disconnect and power path switching
• Solar charge controllers and DC power distribution

What's in the Box

• 1 × IRF4905 P-channel MOSFET

Tip: Connect the source to the positive supply and the load to the drain. The MOSFET turns on when the gate is pulled about 10 V below the source and turns off when the gate is at the source voltage, so from an Arduino use an NPN transistor to pull the gate low, with a 10 kΩ resistor from gate to source. On supplies above 20 V, add a zener diode to keep VGS within ±20 V.

Orders placed before 14:00 are ready for pickup the same day. Delivery across Lebanon usually takes 1–3 working days.