Skip to main content
Log in
STMicroelectronics STP3NK50Z — Discrete Semiconductors

STP3NK50Z N-Channel MOSFET, 500 V, 2.3 A, TO-220

MPNSTP3NK50Z
NRND

STMicroelectronics SuperMESH™ N-channel MOSFET, STP3NK50Z, 500 V Vdss, 2.3 A continuous drain, 3.3 Ohm Rds(on) at 10 V, 15 nC gate charge, TO-220-3 through-hole package, -55°C to 150°C junction temperature.

$0.7700Ref. price · indicative, final on quote
STMicroelectronics STP3NK50Z datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

STP3NK50Z 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°C2.3A (Tc)
Power dissipation45W (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, vgs3.3Ohm @ 1.15A, 10V
Gate charge (Qg) (Max) @ vgs15 nC @ 10 V
Input capacitance (Ciss) (Max) @ vds280 pF @ 25 V

Product details

3.3 Ohm Rds(on) and 15 nC gate charge — switching performance

The STP3NK50Z: The gate charge of 15 nC at 10 V and input capacitance of 280 pF at 25 V support switching in flyback and forward converters.

Through-hole TO-220 — mounting and thermal design

The TO-220-3 package is a through-hole, three-lead format with a metal tab for heatsink mounting. The supplier device package is TO-220, which accepts a standard M3 screw or spring clip for thermal interface to a heatsink. Maximum power dissipation is 45 W at case temperature, so adequate heatsinking is required above a few watts of continuous dissipation.

Frequently asked questions

Is STP3NK50Z obsolete or still available?

It is not yet fully discontinued but is not recommended for new designs. Existing production can still source it through independent channels, but a last-time-buy or replacement plan should be in place.

What is the replacement for STP3NK50Z?

An official replacement is not listed in the available records. A suitable substitute would be a pin-compatible 500 V N-channel MOSFET in TO-220 with similar Rds(on) and gate charge — evaluate parts from the same SuperMESH family or from competitors like Infineon or onsemi, verifying footprint and drive voltage compatibility.

Is STP3NK50Z suitable for through-hole mounting?

Yes, the STP3NK50Z is designed for through-hole mounting in a TO-220-3 package. The three leads insert into a PCB, and the metal tab can be bolted to a heatsink for thermal management.