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STMicroelectronics STF40N20 — Discrete Semiconductors

STF40N20 N-Channel MOSFET, 200 V, 40 A, 45 mOhm, TO-220FP

MPNSTF40N20
Obsolete

STMicroelectronics STripFET N-Channel MOSFET, 200 V Vdss, 40 A Id, 45 mOhm Rds(on) at 20 A, 10 V, TO-220-3 Full Pack (TO-220FP), Through Hole, -55 to 150 °C.

STMicroelectronics STF40N20 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

STF40N20 specifications
ParameterValue
SeriesSTripFET™
FET typeN-Channel
MountingThrough Hole
Drain to source voltage200 V
Drive voltage (Max rds on, min rds on)10V
Current - continuous drain (Id) @ 25°C40A (Tc)
Power dissipation40W (Tc)
Operating temperature-55°C~150°C(TJ)
PackageTube
Vgs±20V
TechnologyMOSFET (Metal Oxide)
CaseTO-220-3 Full Pack
Vgs(th) (Max) @ id4V @ 250µA
Rds on (Max) @ id, vgs45mOhm @ 20A, 10V
Gate charge (Qg) (Max) @ vgs75 nC @ 10 V
Input capacitance (Ciss) (Max) @ vds2500 pF @ 25 V

Product details

200 V, 40 A N-channel — the full-pack power switch

The STF40N20: The 45 mOhm maximum on-resistance at 20 A, 10 V gate drive defines the conduction loss floor.

TO-220FP — isolated tab, no washer needed

The TO-220 Full Pack (TO-220FP) package has a fully moulded back — the tab is electrically isolated from the die, so no insulating pad or shoulder washer is required between the device and the heatsink.

Gate drive and switching profile

Gate drive is specified at 10 V for the rated on-resistance.

Obsolete — sourcing through independent distribution

The STF40N20 carries an obsolete lifecycle status.

Frequently asked questions

Can I use STF40N20 in a TO-220 package?

The STF40N20 is supplied in a TO-220 Full Pack (TO-220FP) package, which is a fully isolated variant of the standard TO-220. It fits the same 3-pin through-hole footprint but has a moulded back — no metal tab for direct heatsink contact. The standard TO-220 and TO-220FP are not mechanically interchangeable without adjusting the heatsink interface.