Skip to main content
Log in
STMicroelectronics STF7N105K5 — Discrete Semiconductors

STF7N105K5 N-Channel MOSFET, 1050 V, 4 A, TO-220FP

MPNSTF7N105K5
Active

STMicroelectronics SuperMESH5™ N-Channel MOSFET, STF7N105K5, 1050 V Vdss, 4 A Id, 2 Ohm Rds(on) at 10 V, TO-220-3 Full Pack through-hole package, -55 to 150 °C junction temperature.

$3.0700Ref. price · indicative, final on quote
STMicroelectronics STF7N105K5 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

STF7N105K5 specifications
ParameterValue
SeriesSuperMESH5™
FET typeN-Channel
MountingThrough Hole
Drain to source voltage1050 V
Drive voltage (Max rds on, min rds on)10V
Current - continuous drain (Id) @ 25°C4A (Tc)
Power dissipation25W (Tc)
Operating temperature-55°C~150°C(TJ)
PackageTube
Vgs±30V
TechnologyMOSFET (Metal Oxide)
CaseTO-220-3 Full Pack
Vgs(th) (Max) @ id5V @ 100µA
Rds on (Max) @ id, vgs2Ohm @ 2A, 10V
Gate charge (Qg) (Max) @ vgs17 nC @ 10 V
Input capacitance (Ciss) (Max) @ vds380 pF @ 100 V

Product details

The STF7N105K5: The 1050 V Vdss rating suits offline flyback converters, PFC stages, and auxiliary power supplies running from rectified mains. The TO-220FP full-pack package isolates the tab from the heatsink, simplifying assembly in metal enclosures. That 2 Ohm figure at 10 Vgs is the number to use for conduction loss calculations in a hard-switched converter.

Gate-drive voltage and threshold — a checklist for the first prototype

The STF7N105K5 specifies a 10 V gate drive for the rated on-resistance, with a maximum gate-source voltage of ±30 V. The gate threshold voltage is 5 V maximum at 100 µA drain current. Input capacitance is 380 pF at 100 V Vds. Through-hole mounting in the TO-220-3 Full Pack package means the leads are designed for soldering into a PCB or wiring into a terminal block. The full-pack construction isolates the mounting hole from the drain, so no mica washer or sil-pad is needed when bolting to a chassis or heatsink — just thermal grease. That saves a BOM line and a manual assembly step.

The base product number STF7 covers the family, and the K5 suffix denotes the 1050 V variant.

Frequently asked questions

What is the VDS rating of STF7N105K5?

The drain-to-source voltage rating is 1050 V. This is the maximum voltage the MOSFET can block when turned off, making it suitable for offline converters operating from rectified 230 VAC mains with surge margin.

What is the closest pin-compatible alternative to STF7N105K5?

Within the STF7 family, the base product number STF7 covers multiple voltage and current variants. The K5 suffix specifically denotes the 1050 V, 4 A version. For a different voltage or current rating within the same TO-220FP footprint, check the STF7 series variants — they share the same package and pinout.