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STMicroelectronics STP6NK50Z — Discrete Semiconductors

STP6NK50Z N-Channel MOSFET, 500V 5.6A, TO-220, Obsolete

MPNSTP6NK50Z
Obsolete

STMicroelectronics SuperMESH™ N-Channel MOSFET, 500V Vdss, 5.6A Id @ 25°C, 1.2Ω Rds(on) @ 2.8A 10V, 24.6nC Qg, TO-220-3 through-hole, -55°C to 150°C.

STMicroelectronics STP6NK50Z datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

STP6NK50Z 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°C5.6A (Tc)
Power dissipation90W (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, vgs1.2Ohm @ 2.8A, 10V
Gate charge (Qg) (Max) @ vgs24.6 nC @ 10 V
Input capacitance (Ciss) (Max) @ vds690 pF @ 25 V

Product details

500V, 5.6A, 1.2Ω — the SuperMESH™ switch for off-line supplies

The STP6NK50Z is an N-channel MOSFET from STMicroelectronics' SuperMESH™ series, built for high-voltage switching in power supplies, adapters, and lighting ballasts. The TO-220 through-hole package handles 90 W dissipation with a proper heatsink — the thermal pad is the tab, so the mounting screw and interface pad are part of the thermal path.

Gate drive and switching — what the numbers mean

The 1.2 Ω Rds(on) is specified at 10 V gate drive, not 4.5 V. The threshold voltage maxes at 4.5 V at 50 µA, but the channel is not fully enhanced until the gate sees the full 10 V. If your controller drives a lower gate voltage, expect the on-resistance to climb. The 24.6 nC Qg at 10 V is modest — a standard totem-pole gate driver or a small bootstrap capacitor can handle it. The 690 pF Ciss is low enough that the Miller plateau is brief, which helps keep cross-conduction losses down in half-bridge topologies.

For new designs, look at current SuperMESH™ parts with similar voltage and current ratings.

Frequently asked questions

Is STP6NK50Z obsolete?

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What is the replacement for STP6NK50Z?

Critical for design engineers and buyers to find a direct drop-in equivalent to avoid board re-spin.

STP6NK50Z datasheet PDF

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STP6NK50Z pinout

Maintenance techs and engineers require pin assignment for correct installation.

Where to buy STP6NK50Z?

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STP6NK50Z price

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