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Transistors IRF9540 P‑Channel Power MOSFET

IRF9540 – P‑Channel Power MOSFET (TO‑220)

Overview:

The IRF9540 is a high-performance P‑Channel MOSFET in a TO‑220 package, designed for switching and amplification in high-side load control, converters, and power management. It supports continuous currents of -100 V and -19 A, as well as pulses of -72 A, making it suitable for automotive, industrial, and battery-powered systems.

Key Features:

  • P‑Channel enhancement-mode MOSFET

  • Drain‑Source Voltage (V<sub>DS</sub>) = -100 V

  • Continuous Drain Current = -19 A @ 25 °C

  • Pulse Drain Current = -72 A

  • Low R<sub>DS(on)</sub> ≈ 0.20 Ω @ V<sub>GS</sub> = -10 V

  • Fast switching, repetitive avalanche rated

  • TO‑220 package with low thermal resistance

  • Operating junction up to 175 °C 

Technical Specifications:

ParameterValue
V<sub>DS</sub>-100 V
V<sub>GS</sub>±20 V
Continuous I<sub>D</sub>-19 A @ 25 °C, -13 A @ 100 °C
Pulsed I<sub>D</sub>-72 A
R<sub>DS(on)</sub>0.20 Ω @ V<sub>GS</sub> = -10 V
Q<sub>g</sub> (Total Gate Charge)61 nC
EAS (Single Avalanche)640 mJ
Power Dissipation (TC = 25 °C)150 W
PackageTO‑220AB, metal-tab heater sinkable
Temperature Range–55 °C to +175 °C

Pinout (Front View, TO‑220):

yaml
CopyEdit
             Tab = Drain
Pin 1: Gate
Pin 2: Drain
Pin 3: Source (Body diode internal)

How It Works:

Driving a P‑Channel MOSFET like the IRF9540 requires pulling the Gate lower than the Source (e.g., Source = +12 V, Gate = 0 V → MOSFET ON). When the Gate is near Source voltage, it turns OFF. Ideal for high-side switching. vishay.com+1digikey.com+1eandc.ru+2digikey.com+2vishay.com+2components101.com+1components101.com+1

Wiring Example – High‑Side Power Switching:

  1. Source (Pin 3) → +12 V

  2. Drain (Pin 2) → Load → Ground

  3. Gate (Pin 1) → Logic output (e.g., Arduino) through 10 kΩ pull-up resistor to +12 V; gate driven to 0 V to turn ON, 12 V to turn OFF.

Don’t forget:

  • Use a gate resistor (e.g., 100 Ω) to prevent oscillations

  • Include a flyback diode across inductive loads (motors, solenoids)

  • Ensure Source and Gate voltage difference ≤ 20 V

Applications:

  • High-side switching of motors and solenoids

  • Battery-powered systems requiring positive-side control

  • Power conversion circuits and amplifiers

  • Automotive 12 V/24 V systems

  • Load balancing and voltage regulation

Resources:

20.00 LE 20.00 LE

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MOSFET Transistors P‑Channel