IRFB4115 Datasheet, Equivalent, Pinout & Price

IRFB4115 MOSFET Complete Details | Working Principle and Best 5 Equivalent MOSFETs

IRFB4115

If you’re working on high-power designs like motor drivers, power supplies, or inverters, the IRFB4115 MOSFET is a solid choice. It handles voltages up to 150V and continuous currents of over 120A easily. With a low on-resistance of just 4.5mΩ, it stays cool and efficient. Its low gate charge ensures fast switching—perfect for high-frequency applications. Packaged in the familiar TO-220 form, it’s easy to mount with excellent heat dissipation. Ideal for battery protection, UPS systems, or power tools.

IRFB4115 Pinout

When using the IRFB4115 MOSFET, keep these tips in mind: Connect the gate (G) to your driver chip through a small resistor (10~100Ω) to avoid spikes. For the drain (D), use wider PCB traces since it handles high voltage and current. The source (S) usually connects directly to ground or the load ground. Remember, the back metal plate connects to the drain, so insulate it carefully if you use a heatsink. Also, never leave the gate floating—this prevents accidental triggering or ESD damage.

IRFB4115 Equivalent MOSFET Transistor

If you’re looking for alternatives to the IRFB4115, the IRFB3207 is a good choice with even better current capacity and lower resistance, but limited to 75V, suitable for battery or low-voltage systems. STP75NF75 is a budget-friendly mid-current substitute, but it runs hotter due to slightly higher resistance. The IRF1405 offers strong current handling, yet its 55V voltage rating means it’s strictly for low-voltage applications—don’t use it in high-voltage situations.

IRFB4115 High Current Switch Circuit

This simple IRFB4115 circuit is perfect if you’re using an MCU to control a high-power LED (12V, 12W). It’s a low-side switch, with the LED positive side connected to 12V and negative side to the MOSFET drain. The MOSFET source is grounded. When your MCU pin goes high, the MOSFET switches on and the LED lights up. If the MCU pin goes low or floats, the MOSFET turns off, switching off the LED. Resistors RIN and RGS protect the MOSFET gate, while a push-button with a pull-up resistor provides manual control.

IRFB4115 Usage

If you’re building high-power circuits like DC-DC converters, inverters, or motor drivers, the IRFB4115 MOSFET is ideal. It handles up to 150V and 120A easily, with ultra-low resistance (4.5mΩ), reducing heat and boosting efficiency. It’s perfect for high-voltage battery systems, powerful motor controllers, LED dimming, or even replacing mechanical relays for faster switching.