Skip to main content
Log in
STMicroelectronics STF5N52K3 — Discrete Semiconductors

STF5N52K3 N-Channel MOSFET, 525 V, 4.4 A, SuperMESH3™

MPNSTF5N52K3
Obsolete

STMicroelectronics SuperMESH3™ STF5N52K3, N-Channel MOSFET, 525 V Vdss, 4.4 A continuous drain, 1.5 Ohm Rds(on) @ 10 V, TO-220-3 Full Pack, -55°C to 150°C.

$1.7800Ref. price · indicative, final on quote
STMicroelectronics STF5N52K3 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

STF5N52K3 specifications
ParameterValue
SeriesSuperMESH3™
FET typeN-Channel
MountingThrough Hole
Drain to source voltage525 V
Drive voltage (Max rds on, min rds on)10V
Current - continuous drain (Id) @ 25°C4.4A (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) @ id4.5V @ 50µA
Rds on (Max) @ id, vgs1.5Ohm @ 2.2A, 10V
Gate charge (Qg) (Max) @ vgs17 nC @ 10 V
Input capacitance (Ciss) (Max) @ vds545 pF @ 100 V

Product details

The STF5N52K3 is listed as obsolete. Any remaining inventory on the independent market is the only source. For a production BOM that requires this part, the procurement path is surplus and broker stock. Availability and current pricing must be confirmed at quote time — the independent channel carries no scheduled replenishment.

525 V drain-source rating — switching power supply fit

The 525 V Vdss rating suits offline flyback and forward converters where the primary-side drain sees rectified mains plus leakage inductance spikes. 4.4 A continuous drain current and 1.5 Ohm Rds(on) at 10 V gate drive require a 25 W package dissipation budget.

The supplier device package is TO-220FP. Power dissipation is limited to 25 W at case temperature; the junction-to-case thermal path is the limiting factor, not the package itself.

Frequently asked questions

Is STF5N52K3 obsolete and discontinued?

Yes, the STF5N52K3 is listed as obsolete. STMicroelectronics has discontinued production, and the part is no longer available through the factory channel. Surplus and broker inventory is the only supply route.

Can I use STF5N52K3 for switching power supply?

Yes, the 525 V Vdss and 4.4 A rating suit primary-side switches in offline flyback and forward converters. The 17 nC gate charge keeps switching losses manageable at moderate frequencies, but the 1.5 Ohm Rds(on) is higher than modern alternatives — account for conduction loss in the thermal budget.