Skip to main content
Log in
STMicroelectronics STFW8N120K5 — Discrete Semiconductors

STFW8N120K5 N-Channel MOSFET, 1200 V, 6 A, TO-3PF

MPNSTFW8N120K5
Active

STMicroelectronics MDmesh™ K5 series, N-Channel MOSFET, 1200 V drain-source, 6 A continuous drain, 2 Ohm on-resistance at 10 V gate drive, TO-3P-3 Full Pack through-hole package, -55 to 150 °C junction temperature.

$4.4512Ref. price · indicative, final on quote
STMicroelectronics STFW8N120K5 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

STFW8N120K5 specifications
ParameterValue
SeriesMDmesh™ K5
FET typeN-Channel
MountingThrough Hole
Drain to source voltage1200 V
Drive voltage (Max rds on, min rds on)10V
Current - continuous drain (Id) @ 25°C6A (Tc)
Power dissipation48W (Tc)
Operating temperature-55°C ~ 150°C (TJ)
PackageTube
Vgs±30V
TechnologyMOSFET (Metal Oxide)
CaseTO-3P-3 Full Pack
Vgs(th) (Max) @ id5V @ 100µA
Rds on (Max) @ id, vgs2Ohm @ 2.5A, 10V
Gate charge (Qg) (Max) @ vgs13.7 nC @ 10 V
Input capacitance (Ciss) (Max) @ vds505 pF @ 100 V

Product details

1200 V N-channel MOSFET — the high-voltage switching workhorse

The STFW8N120K5: Gate charge is 13.7 nC at 10 V.

At 2.5 A load, the 2 Ohm on-resistance drops about 12.5 W of conduction loss. The 48 W power dissipation ceiling (at case temperature) gives roughly 3.8x headroom at that current, so the part runs cool with a reasonable heatsink.

Package and mounting — TO-3PF through-hole

The TO-3PF is a fully isolated through-hole package — the metal tab is electrically isolated from the die, so no insulating pad is needed between the package and the heatsink.

Frequently asked questions

What is the closest pin-compatible alternative to STFW8N120K5 in this component family?

Within the MDmesh K5 series, the STFW8N120K5 is a specific voltage and current variant. Pin-compatible alternatives would share the TO-3PF package and gate-drive voltage but differ in Rds(on) or current rating — check the STMicroelectronics MDmesh K5 family table for a parametric match to your load and thermal budget.