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STMicroelectronics STD5NK52ZD-1 — Discrete Semiconductors

STD5NK52ZD-1 N-Channel MOSFET, 520 V, 1.5 Ohm, SuperMESH

MPNSTD5NK52ZD-1
Obsolete

STMicroelectronics STD5NK52ZD-1, N-Channel MOSFET, SuperMESH™, 520 Vdss, 4.4 A, 1.5 Ohm Rds(on) @ 10 V, 16.9 nC Qg, TO-251-3 (I-PAK), Through Hole, -55°C to 150°C.

STMicroelectronics STD5NK52ZD-1 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

STD5NK52ZD-1 specifications
ParameterValue
SeriesSuperMESH™
FET typeN-Channel
MountingThrough Hole
Drain to source voltage520 V
Drive voltage (Max rds on, min rds on)10V
Current - continuous drain (Id) @ 25°C4.4A (Tc)
Power dissipation70W (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, vgs1.5Ohm @ 2.2A, 10V
Gate charge (Qg) (Max) @ vgs16.9 nC @ 10 V
Input capacitance (Ciss) (Max) @ vds529 pF @ 25 V

Product details

520 V N-channel MOSFET for off-line power conversion

The TO-251 I-PAK through-hole package suits single-sided boards or designs where a heatsink is soldered to the tab.

On-resistance and gate charge — the switching loss trade-off

Rds(on) of 1.5 Ohm at 10 V is moderate for a 520 V device; conduction loss at 2 A is about 6 W, which the 70 W package dissipation can handle with adequate heatsinking. The 16.9 nC total gate charge keeps the gate-drive energy low, so a small-signal MOSFET driver or a PWM controller output can switch it at 100 kHz without excessive driver dissipation. Input capacitance of 529 pF at 25 V means the Miller plateau is manageable for most offline controllers.

It is no longer manufactured by STMicroelectronics and has no official successor listed. Buyers needing this exact part for repair, legacy BOM, or last-time-buy fulfillment should source through independent distribution.

Temperature grade and application environment

The wide temperature margin also supports derating for reliability in long-life designs.

Frequently asked questions

What is the equivalent or replacement for STD5NK52ZD-1?

STMicroelectronics has not published an official replacement for the STD5NK52ZD-1. A cross-reference search should target N-channel MOSFETs in the TO-251 (I-PAK) package with 520 V Vdss, 4.4 A Id, and 1.5 Ohm Rds(on) or lower. Parts from the SuperMESH family with similar ratings (e.g., STD5NK50Z series) may be pin-compatible, but verify the gate charge and threshold voltage against the application.

Where can I buy STD5NK52ZD-1?

Submit an RFQ for current availability and pricing; we confirm both at quote time. No stock or price figures are published here.