IRFZ44 N-CHANNEL MOSFET 49A 55V

The IRFZ44 is one of the most popular and widely used N-channel power MOSFETs in the electronics industry, prized for its combination of high current handling, low on-resistance, and affordable price . Built into the rugged TO-220 through-hole package , it is easy to mount on standard heatsinks and integrate into both prototype and production designs. With a drain-source voltage rating of 55V and an exceptional continuous drain current capability of 49A , the IRFZ44 is well suited for driving very high-current loads such as DC motors, solenoids, heavy-duty relays, lamps, heaters, and high-power LEDs . Its remarkably low on-resistance of just 17.5 m? keeps conduction losses to a minimum, which translates to high efficiency, low heat generation, and longer device life under heavy loads. The IRFZ44 is especially well known in the automotive aftermarket and car audio community , where it is commonly used in 12V power amplifiers, DC-DC step-up converters, and inverters thanks to its high current rating and robust performance at automotive voltage levels. It's also a favorite for PWM motor speed controllers , soft-start circuits , and electronic load designs. Note on gate drive: The standard IRFZ44 is not a true logic-level MOSFET . Although it begins conducting around 4V, it typically requires a gate-source voltage of around 10V to fully enhance and reach its rated low on-resistance. To switch the IRFZ44 cleanly from a 5V Arduino or 3.3V microcontroller, use a MOSFET gate driver IC or a transistor-based driver stage . For direct logic-level switching, consider the IRLZ44N , which is specifically designed to switch fully from 5V logic. Specifications Part Number: IRFZ44 Transistor Type: N-Channel Power MOSFET Polarity: N-Channel Drain-Source Voltage (V_DSS) Max: 55V Continuous Drain Current (I_D) Max: 49A On-Resistance (R_DS(on)): 17.5 m? Package / Case: TO-220 Mounting Type: Through-hole Pin Count: 3 (Gate, Drain, Source) Pin Configuration (TO-220) Pin 1: Gate (G) Pin 2: Drain (D) Pin 3: Source (S) Applications DC motor control and H-bridge driver circuits PWM speed control for motors, fans, and pumps Car audio amplifiers and 12V automotive electronics DC-DC converters and 12V boost / inverter circuits Switch-mode power supplies (SMPS) Battery management and battery disconnect systems Solar charge controllers and renewable energy High-current LED and lamp drivers Solenoid and relay drivers Inverter and converter circuits Industrial control and automation systems Robotics and high-current actuator control Welding equipment and power tools Electronic loads and battery testers Arduino, Raspberry Pi, ESP32 projects (with appropriate gate driver)