MosfetLab Pro

An interactive lab for learning how MOSFET transistors behave. Move the sliders, watch the circuit and graphs update, and see how gate voltage, load, frequency and temperature affect a real switching circuit.

WHAT’S INSIDE

• Simulator: set gate voltage, drain voltage and load resistance, and see the drain current (ID vs VGS curve) and power update on a live circuit diagram.
• Gate Charge Lab: follow how the gate charges over time and see where the Miller plateau appears.
• Switching Analyzer: view switching waveforms and how gate resistance changes switching speed and losses.
• PWM Motor Lab: drive a motor load with PWM, adjust frequency and duty cycle, and see why a flyback diode is needed.
• Heat Simulator: watch the junction temperature rise over time with different ambient temperatures, currents and heatsink sizes.
• 8 calculators: gate resistor, power dissipation, heatsink, switching loss, PWM, RDS(on) loss, efficiency and thermal.
• Database: key specs for 8 common parts: IRFZ44N, IRLZ44N, IRF3205, IRF540, AO3400, 2N7000, BS170 and IRL3705N.
• Learn: 10 short lessons covering MOSFET basics, structure, N-channel vs P-channel, enhancement and depletion mode, gate charge, switching speed, PWM control, heat dissipation and power electronics.
• Schematic diagrams you can pinch to zoom.

WHO IT’S FOR

Electronics students, hobbyists and makers who want to understand what a MOSFET is doing before building a circuit, and anyone who wants a quick estimate of losses or heat.

GOOD TO KNOW

The simulations use simplified models meant for learning and rough estimates. For a final design, always check the manufacturer’s datasheet.