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STMicroelectronics STF40NF03L — Discrete Semiconductors

STF40NF03L STripFET N-Ch MOSFET, 30 V, 22 mΩ, TO-220FP

MPNSTF40NF03L
Obsolete

STMicroelectronics STripFET™ series, N-Channel MOSFET, 30 V drain-source, 22 mΩ Rds(on) at 20 A, 10 V gate drive, 23 A continuous drain, TO-220 Full Pack through-hole package, -55°C to 175°C junction temperature.

STMicroelectronics STF40NF03L datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

STF40NF03L specifications
ParameterValue
SeriesSTripFET™
FET typeN-Channel
MountingThrough Hole
Drain to source voltage30 V
Drive voltage (Max rds on, min rds on)4.5V, 10V
Current - continuous drain (Id) @ 25°C23A (Tc)
Power dissipation25W (Tc)
Operating temperature-55°C ~ 175°C (TJ)
PackageTube
Vgs±16V
TechnologyMOSFET (Metal Oxide)
CaseTO-220-3 Full Pack
Vgs(th) (Max) @ id2.5V @ 250µA
Rds on (Max) @ id, vgs22mOhm @ 20A, 10V
Gate charge (Qg) (Max) @ vgs15 nC @ 4.5 V
Input capacitance (Ciss) (Max) @ vds770 pF @ 25 V

Product details

The STF40NF03L: 30 V drain-source rating and 22 mΩ maximum on-resistance at 20 A suit load switches, DC-DC converter primary-side switching, and battery-management circuits. The TO-220 Full Pack package provides full isolation from the heatsink.

Why the 22 mΩ Rds(on) and 23 A rating matter for your BOM

At 20 A drain current with 10 V gate drive, the 22 mΩ maximum Rds(on) keeps conduction loss under 9 W at full load — manageable in the TO-220FP with its 25 W power dissipation ceiling. The gate charge is 15 nC at 4.5 V, so the driver sees a light capacitive load — good news for fast switching without a high-current gate driver.

Obsolete — sourcing reality and what to do

The STF40NF03L is listed as obsolete. It is no longer in production from STMicroelectronics, so new-stock procurement goes through the surplus and broker channel.

Frequently asked questions

What is the Vgs threshold for STF40NF03L?

The maximum gate threshold voltage is 2.5 V at a drain current of 250 µA. The drive voltage range for achieving the specified Rds(on) is 4.5 V (minimum) to 10 V (maximum).