STP40NF10L N-Channel Power MOSFET — 100V / 40A, TO-220, Logic-Level Gate

STP40NF10L N-Channel Power MOSFET — 100V / 40A, TO-220

The STP40NF10L is a logic-level N-channel power MOSFET from STMicroelectronics rated at 100V drain-source voltage and 40A continuous drain current, with an on-resistance of just 28mΩ @ Vgs=10V. The “L” suffix denotes a logic-level gate threshold — the device turns on fully with a 4.5V gate drive, making it directly compatible with 5V Arduino and 3.3V microcontroller GPIO without a gate driver IC in most low-frequency switching applications.

Key Specifications

Parameter	Value
Channel Type	N-Channel
Drain-Source Voltage (Vds)	100V
Continuous Drain Current (Id)	40A @ Tc=25°C
Pulsed Drain Current (Idm)	160A
On-Resistance (Rds(on))	28mΩ @ Vgs=10V
Gate Threshold Voltage (Vgs(th))	1.0V – 2.5V
Logic-Level Gate Drive	Fully on @ Vgs=4.5V
Total Power Dissipation	110W @ Tc=25°C
Gate Charge (Qg)	43nC typical
Body Diode Forward Voltage	1.3V typical
Package	TO-220 (through-hole)
Operating Temperature	-55°C to +175°C
Manufacturer	STMicroelectronics
RoHS Compliant	Yes

Why Choose the STP40NF10L?

• Logic-level gate (“L” suffix) — fully enhanced at 4.5V Vgs, drives directly from 5V Arduino or 3.3V MCU GPIO without a dedicated gate driver in low-frequency applications
• Low Rds(on) = 28mΩ — minimal conduction loss at 40A; only 1.12W dissipated at 20A continuous
• 100V rating — suitable for 12V, 24V, and 48V motor and power supply circuits with ample voltage headroom
• TO-220 package — easy heatsinking, breadboard-compatible leads, industry-standard footprint
• Integrated body diode — built-in freewheeling diode for inductive load switching (motors, solenoids)

Typical Applications

• DC motor speed control (PWM switching, H-bridge low-side)
• High-current LED dimmer (12V/24V strips)
• Solenoid and relay driver
• DC-DC buck converter low-side switch
• Battery management system (BMS) discharge switch
• Electronic load and dummy load circuit
• Arduino/Raspberry Pi high-current GPIO switch

Driving from Arduino (5V GPIO)

Connect the gate directly to an Arduino PWM pin via a 100–470Ω gate resistor (limits gate current spikes). Connect source to GND. The STP40NF10L will switch fully on with 5V Vgs. For 3.3V MCUs, verify Rds(on) at Vgs=3.3V in the datasheet — a gate driver (e.g. TC4427) is recommended for high-frequency PWM above 20kHz.

Frequently Asked Questions

Q: Do I need a heatsink?

At low duty cycles and currents under ~5A, no heatsink is needed. Above 10A continuous or high PWM frequencies, attach a TO-220 heatsink with thermal paste. At 40A continuous, the junction temperature will exceed safe limits without adequate heatsinking.

Q: Can I use this in an H-bridge for bidirectional motor control?

Yes — use four STP40NF10L in a full H-bridge configuration. For the high-side switches, a bootstrap gate driver (e.g. IR2104, DRV8302) is required to generate the above-supply gate voltage needed to turn on high-side N-channel MOSFETs.

Q: What is the difference between STP40NF10L and STP40NF10?

The “L” suffix indicates a logic-level gate threshold (Vgs(th) 1.0–2.5V, fully on at 4.5V). The standard STP40NF10 requires a higher gate drive voltage (typically 10V) for full enhancement. Use the “L” version for direct microcontroller drive.

Package Contents

• 1× STP40NF10L N-Channel Power MOSFET (TO-220)

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