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STMicroelectronics STD4NK50ZD — Discrete Semiconductors

STD4NK50ZD N-Channel MOSFET, 500V 3A DPAK, Obsolete

MPNSTD4NK50ZD
Obsolete

STMicroelectronics SuperMESH™ N-Channel MOSFET, STD4NK50ZD, 500 V Vdss, 3 A Id @ 25°C, 2.7 Ohm Rds(on) @ 1.5 A 10 V, 12 nC Qg, DPAK (TO-252), -55°C to 150°C.

STMicroelectronics STD4NK50ZD datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

STD4NK50ZD specifications
ParameterValue
SeriesSuperMESH™
FET typeN-Channel
MountingSurface Mount
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)
PackageTape & Reel (TR); Cut Tape (CT)
Vgs±30V
TechnologyMOSFET (Metal Oxide)
CaseTO-252-3, DPak (2 Leads + Tab), SC-63
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 SuperMESH MOSFET in DPAK

The STD4NK50ZD: The device comes in a surface-mount DPAK (TO-252) package, suited for automated assembly in power supply, lighting, and auxiliary converter stages where board space is constrained.

Gate charge and switching — what the 12 nC figure means for the drive stage

The total gate charge is 12 nC at 10 V. The input capacitance is 310 pF at 25 V drain-source.

That means the factory has stopped production and no further last-time-buy windows are open. Any procurement for this order code goes through the independent surplus and broker channel. Availability is limited to whatever inventory exists in distribution — once that stock is consumed, the part is gone. For a production BOM that still calls out this exact number, the only path is sourcing verified, date-code-controlled inventory through an independent distributor.

Frequently asked questions

What is the replacement for STD4NK50ZD?

The product is obsolete, so buyers need a drop-in replacement to avoid redesign.

Where can I buy STD4NK50ZD?

Buyers need to source the part from distributors that still have stock.

What are the specifications of STD4NK50ZD?

Engineers need to verify it meets their design requirements.

Is STD4NK50ZD still available in stock?

Availability affects purchasing decisions and urgency.

What is the equivalent part to STD4NK50ZD?

Finding equivalent parts expands sourcing options and potential cost savings.

What is the pinout of STD4NK50ZD?

Techs and engineers need to know pin assignments for replacement.