The IRF9640 MOSFET is a pivotal electronic component with noteworthy specifications, often employed in various electronic applications. This power MOSFET, belonging to the P-channel enhancement mode, exhibits characteristics that make it suitable for power amplification and switching circuits. Understanding its specifications, testing procedures, and exploring equivalent components is crucial for engineers and enthusiasts alike.

IRF9640 MOSFET Details

Data Sheet Overview:

Type: P-Channel MOSFET

Voltage Rating: -200V

Current Rating: -11A

Power Dissipation: 125W

Gate Threshold Voltage (V_GS(th)): -2V to -4V

On-State Resistance (R_DS(on)): 0.6 ohms (max)

Package: TO-220AB

Equivalent MOSFETs:

MOSFET Comparison Table

Parameter	IRF9640	IRF9630	IRF9620	IRF9610	IRF9640N	IRFP9240	IRF044
Voltage Rating (V)	-200V	-200V	-200V	-200V	-200V	-200V	-60V
Current Rating (A)	-11A	-9A	-4.3A	-1.8A	-9A	-12A	-19A
Power Dissipation (W)	125W	N/A	N/A	N/A	N/A	150W	140W
Gate Threshold Voltage (VGS(th))	-2V to -4V	-2V to -4V	-2V to -4V	-2V to -4V	-2V to -4V	-2V to -4V	-2V to -4V
On-State Resistance (ohms)	0.6 (max)	N/A	N/A	N/A	N/A	0.3 (max)	0.095 (max)
Package	TO-220AB	TO-220AB	TO-220AB	TO-220AB	TO-220AB	TO-247	TO-220AB

Checking a MOSFET Using a Digital Multimeter

1. Set Multimeter to Diode Test Mode:
   • Turn on your multimeter and set it to the diode test mode. This mode is often represented by a diode symbol on the multimeter.
2. Identify MOSFET Pins:
   • Identify the three pins of the MOSFET: gate (G), drain (D), and source (S). Refer to the datasheet for your specific MOSFET to confirm pin configurations.
3. Check Gate-Source Diode:
   • Place the multimeter’s positive lead on the MOSFET’s gate (G) and the negative lead on the source (S). Note the reading.
   • Reverse the leads (positive on source, negative on gate) and note the reading.
   • If one direction shows a low resistance (near 0 ohms) and the other shows a high resistance (infinite or OL), the gate-source diode is likely intact.
4. Check Drain-Source Diode:
   • Place the positive lead on the MOSFET’s drain (D) and the negative lead on the source (S). Note the reading.
   • Reverse the leads and note the reading.
   • Similar to gate-source, if one direction shows low resistance and the other shows high resistance, the drain-source diode is likely intact.
5. Check Gate-Drain Resistance:
   • Measure the resistance between the gate (G) and drain (D) with the multimeter. It should read as an open circuit (infinite resistance).
6. Check Gate-Source Voltage:
   • Apply a small voltage (usually around 5V) between the gate (G) and source (S). This should be done with the MOSFET removed from the circuit. Monitor for any change in the drain-source resistance.