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STMicroelectronics STD5NK40Z-1 — Discrete Semiconductors

STD5NK40Z-1 N-Channel MOSFET, 400V, 3A, TO-251

MPNSTD5NK40Z-1
Active

STMicroelectronics SuperMESH series STD5NK40Z-1, N-Channel MOSFET, 400V Vdss, 3A Id, 1.8 Ohm Rds(on) at 1.5A, 10V, TO-251 (IPAK) through-hole package, -55°C to 150°C operating temperature.

$1.5700Ref. price · indicative, final on quote
STMicroelectronics STD5NK40Z-1 datasheet (PDF)
PackagingTO-251-3 Short Leads, IPak, TO-251AA
RoHSROHS3 Compliant
SeriesSuperMESH™
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

STD5NK40Z-1 specifications
ParameterValue
SeriesSuperMESH™
FET typeN-Channel
MountingThrough Hole
Drain to source voltage400 V
Drive voltage (Max rds on, min rds on)10V
Current - continuous drain (Id) @ 25°C3A (Tc)
Power dissipation45W (Tc)
Operating temperature-55°C ~ 150°C (TJ)
PackageTube
Vgs±30V
TechnologyMOSFET (Metal Oxide)
CaseTO-251-3 Short Leads, IPak, TO-251AA
Vgs(th) (Max) @ id4.5V @ 50µA
Rds on (Max) @ id, vgs1.8Ohm @ 1.5A, 10V
Gate charge (Qg) (Max) @ vgs17 nC @ 10 V
Input capacitance (Ciss) (Max) @ vds305 pF @ 25 V

Product details

400V, 3A N-Channel — the SuperMESH power switch for offline supplies

It comes in a TO-251 (IPAK) through-hole package — a compact three-lead footprint that suits automated insertion or hand-soldering in low-to-medium power offline converters, auxiliary supplies, and lighting ballasts.

1.8 Ohm Rds(on) — conduction loss at the switching node

Maximum on-resistance is 1.8 Ohm at 1.5 A drain current with 10 V gate drive.

Through-hole TO-251 — board-mounting and thermal path

The TO-251 (IPAK) package has three short leads and a metal tab that carries the drain. The through-hole leads provide mechanical strength for point-of-load regulators or modules that see vibration.

Frequently asked questions

What is the Rds(on) of STD5NK40Z-1?

This is the spec to use for worst-case conduction loss calculations in your power stage.