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STMicroelectronics STD4NK50Z-1 — Discrete Semiconductors

STD4NK50Z-1 N-Channel MOSFET, 500 V, 3 A, SuperMESH, IPak

MPNSTD4NK50Z-1
Active

STMicroelectronics SuperMESH™ N-Channel MOSFET, 500 V Vdss, 3 A continuous drain, 2.7 Ω Rds(on) at 10 V, 12 nC gate charge, through-hole IPak (TO-251AA) package, -55 to 150 °C operating range.

$0.2634Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

STD4NK50Z-1 specifications
ParameterValue
SeriesSuperMESH™
FET typeN-Channel
MountingThrough Hole
Drain to source voltage500 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, vgs2.7Ohm @ 1.5A, 10V
Gate charge (Qg) (Max) @ vgs12 nC @ 10 V
Input capacitance (Ciss) (Max) @ vds310 pF @ 25 V

Product details

500 V, 3 A N-channel in an IPak — what you're looking at

The STD4NK50Z-1 is a 500 V, 3 A N-channel power MOSFET from STMicroelectronics' SuperMESH™ series, built with a Zener-protected gate structure for enhanced avalanche ruggedness.

At 2.7 Ω max (1.5 A, 10 V), the on-resistance is moderate — not the lowest in the 500 V class, but paired with a 12 nC gate charge it keeps the driver stage simple.

Through-hole IPak — board-level fit for repair and retrofit

The IPak (TO-251AA) package has three short leads that sit flush with the plastic body — no tab overhang like a TO-220. It's a common footprint for power stages on single-layer boards and in cramped enclosures where a TO-220 won't fit. The through-hole mount means it's rework-friendly: a soldering iron and solder wick are enough to swap it, which is why you'll see it on power-supply boards that get field repairs.

Lifecycle and sourcing — still a current production part

STMicroelectronics lists the STD4NK50Z-1 as Active. The base product number STD4N covers a family of 500 V N-channel parts; the Z suffix indicates the SuperMESH generation with Zener protection. For dual-sourcing, the closest pin-compatible sibling is the STD4NK50Z (TO-252 DPAK surface-mount variant) — same die, same ratings, different package. The STD4NK50Z-2 (TO-220) is another through-hole option with the same electrical specs but a larger tab for better heatsinking.

Frequently asked questions

What is the direct replacement or equivalent for STD4NK50Z-1?

The STD4NK50Z (DPAK surface-mount) and STD4NK50Z-2 (TO-220 through-hole) are pin-compatible die variants with identical 500 V, 3 A, 2.7 Ω ratings. The STD4NK50Z-2 shares the same through-hole mounting style but uses a larger TO-220 tab for better thermal dissipation.