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STMicroelectronics STP5N52K3 — Discrete Semiconductors

STP5N52K3 N-Channel MOSFET, 525 V, 4.4 A, TO-220

MPNSTP5N52K3
Obsolete

STMicroelectronics SuperMESH3™ N-channel MOSFET, STP5N52K3, 525 V drain-source, 4.4 A continuous drain, 1.5 Ohm Rds(on) at 10 V, TO-220-3 through-hole package.

STMicroelectronics STP5N52K3 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

STP5N52K3 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 dissipation70W (Tc)
Operating temperature-55°C~150°C(TJ)
PackageTube
Vgs±30V
TechnologyMOSFET (Metal Oxide)
CaseTO-220-3
Vgs(th) (Max) @ id4.5V @ 50µA
Rds on (Max) @ id, vgs1.5Ohm @ 2.2A, 10V
Gate charge (Qg) (Max) @ vgs14 nC @ 10 V
Input capacitance (Ciss) (Max) @ vds450 pF @ 100 V

Product details

525 V N-channel in a TO-220 — what you're getting

Housed in a TO-220-3 through-hole package, it targets offline switching supplies, flyback converters, and PFC stages where the 525 V rating gives margin over a 400 V DC bus.

ST lists the STP5N52K3 as obsolete. For BOM lines that still call out this exact code, procurement goes through independent distribution channels — surplus stock, last-time-buy inventory, or broker-sourced new-old-stock.

Input capacitance measures 450 pF at 100 V drain-source, giving a reasonable Ciss figure for the voltage class. The 4.5 V gate threshold maximum at 50 µA drain current means the device needs a full 10 V gate drive to achieve the rated on-resistance — logic-level drive at 5 V will not fully enhance the channel.

The ±30 V maximum gate-source rating gives good noise margin on the gate drive line.

Frequently asked questions

Is STP5N52K3 obsolete and what are the alternatives?

Yes, ST lists the STP5N52K3 as obsolete. For a pin-compatible alternative in the same voltage and current class, look at other SuperMESH3 N-channel MOSFETs in TO-220 with 525 V or higher Vdss and similar Rds(on) — the STP5N52K3's base product number is STP5N, so parts sharing that prefix share the same package and pinout. Availability and fit should be confirmed against the specific application's switching frequency and gate drive voltage.

Where can I find STP5N52K3 pricing and availability?

Since the STP5N52K3 is obsolete, it is not stocked in standard distribution. Submit an RFQ to get current market pricing and stock position for this exact order code.