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STMicroelectronics STP14NK50ZFP — Discrete Semiconductors

STP14NK50ZFP N-Channel MOSFET, 500V 14A TO-220FP

MPNSTP14NK50ZFP
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STMicroelectronics STP14NK50ZFP, SuperMESH™ N-Channel MOSFET, 500V Vdss, 14A Id, 380mOhm Rds(on), 92nC Qg, TO-220-3 Full Pack, -55 to 150°C.

$4.0800Ref. price · indicative, final on quote
STMicroelectronics STP14NK50ZFP datasheet (PDF)
PackagingTO-220-3 Full Pack
RoHSROHS3 Compliant
SeriesSuperMESH™
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

STP14NK50ZFP 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°C14A (Tc)
Power dissipation35W (Tc)
Operating temperature-55°C ~ 150°C (TJ)
PackageTube
Vgs±30V
TechnologyMOSFET (Metal Oxide)
CaseTO-220-3 Full Pack
Vgs(th) (Max) @ id4.5V @ 100µA
Rds on (Max) @ id, vgs380mOhm @ 6A, 10V
Gate charge (Qg) (Max) @ vgs92 nC @ 10 V
Input capacitance (Ciss) (Max) @ vds2000 pF @ 25 V

Product details

500 V, 14 A N-channel — the TO-220FP full-pack MOSFET for offline power stages

The STP14NK50ZFP: The TO-220-3 Full Pack package provides full isolation from the heatsink — no separate insulating washer or pad is needed, which simplifies assembly and reduces thermal interface resistance in high-voltage offline designs.

At 14 A the Rds(on) will be higher due to the current-dependence of the channel resistance; budget conduction losses using the normalised curve from the datasheet. The 92 nC total gate charge at 10 V means a gate driver delivering 1 A can switch the FET in roughly 92 ns — fast enough for 100 kHz hard-switched converters without excessive cross-conduction losses. Input capacitance is 2000 pF at 25 V Vds.

Temperature grade and package — where this part fits

Maximum power dissipation is 35 W at case temperature, derated above 25°C. The TO-220FP full-pack package has a fully isolated tab — the mounting hole is electrically neutral, so the heatsink can share a common ground plane without an insulating pad.

Frequently asked questions

What is the equivalent of STP14NK50ZFP?

For a pin-compatible alternative within the same SuperMESH™ family, review ST's STP14NK50Z series in the TO-220FP package — confirm the Rds(on) and gate charge match your design targets.

Does STP14NK50ZFP come in a surface mount package?

No — the STP14NK50ZFP is supplied in the through-hole TO-220-3 Full Pack package only. For a surface-mount variant, consider the D²PAK (TO-263) version of the same die if available in the SuperMESH™ family.

Can I use STP14NK50ZFP in a switching power supply?

Yes — the 500 V Vdss, 380 mOhm Rds(on), and 92 nC gate charge make it suitable for offline flyback, forward, and PFC stages up to about 150 W, switching at frequencies up to 100 kHz with adequate gate drive.