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STMicroelectronics STD90N4F3 — Discrete Semiconductors

STD90N4F3 N-Channel MOSFET, 40V 80A DPAK - Obsolete

MPNSTD90N4F3
Obsolete

STMicroelectronics STripFET™ III STD90N4F3, N-Channel MOSFET, 40 V Vdss, 80 A Id, 6.5 mOhm Rds(on) @ 10 V, DPAK (TO-252) surface-mount package, -55°C to 175°C junction temperature.

STMicroelectronics STD90N4F3 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

STD90N4F3 specifications
ParameterValue
SeriesSTripFET™ III
FET typeN-Channel
MountingSurface Mount
Drain to source voltage40 V
Drive voltage (Max rds on, min rds on)10V
Current - continuous drain (Id) @ 25°C80A (Tc)
Power dissipation110W (Tc)
Operating temperature-55°C~175°C(TJ)
PackageTape & Reel (TR); Cut Tape (CT)
Vgs±20V
TechnologyMOSFET (Metal Oxide)
CaseTO-252-3, DPak (2 Leads + Tab), SC-63
Vgs(th) (Max) @ id4V @ 250µA
Rds on (Max) @ id, vgs6.5mOhm @ 40A, 10V
Gate charge (Qg) (Max) @ vgs54 nC @ 10 V
Input capacitance (Ciss) (Max) @ vds2200 pF @ 25 V

Product details

40 V, 80 A N-channel power MOSFET in DPAK — what it was designed for

The gate charge is 54 nC at 10 V, so the driver needs to source that charge quickly to hit the switching edges you want in a 100 kHz-ish converter. Input capacitance is 2200 pF at 25 V Vds, a moderate figure that keeps the Miller plateau manageable for a standard gate-driver IC.

The part is available to source through our network, but it is a last-time-buy / broker-market item, so verify stock and pricing at quote time. There is no direct pin-compatible drop-in from ST listed; a replacement search should start with a 40 V N-channel MOSFET in DPAK with similar Rds(on) and gate charge, but you will need to validate the footprint and drive voltage against your layout.

DPAK footprint — reflow and handling notes

The DPAK (TO-252) is a standard surface-mount power package with a tab that carries the drain. It is MSL 1 typically, so no pre-bake needed for most reflow profiles, but check the date code — older stock may have absorbed moisture if the reel was opened. Watch the pad-to-pad clearance on the two-lead version — the tab is the third connection.

Frequently asked questions

What is the replacement for STD90N4F3?

There is no official replacement order code listed by STMicroelectronics for the STD90N4F3. A functional replacement would be a 40 V N-channel MOSFET in DPAK with similar Rds(on) (6.5 mOhm at 10 V) and gate charge (54 nC). You will need to verify the footprint, drive voltage, and thermal performance against your specific layout and switching frequency.

Where can I buy STD90N4F3?

The STD90N4F3 is sourced through our independent distribution network. Submit an RFQ for current availability and pricing — we quote to order, and the price and stock are confirmed at that time. Because the part is obsolete, supply is limited to surplus and broker-channel inventory.