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STMicroelectronics STD40NF03LT4 — Discrete Semiconductors

STD40NF03LT4 N-Channel MOSFET, 30 V, 40 A, DPAK

MPNSTD40NF03LT4
NRND

STMicroelectronics STripFET™ II, STD40NF03LT4, N-Channel MOSFET, 30 Vdss, 40 A continuous drain, 11 mOhm Rds(on) at 20 A, DPAK, -55 to 175 °C.

$1.2500Ref. price · indicative, final on quote
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

STD40NF03LT4 specifications
ParameterValue
SeriesSTripFET™ II
FET typeN-Channel
MountingSurface Mount
Drain to source voltage30 V
Drive voltage (Max rds on, min rds on)5V, 10V
Current - continuous drain (Id) @ 25°C40A (Tc)
Power dissipation80W (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) @ id1V @ 250µA
Rds on (Max) @ id, vgs11mOhm @ 20A, 10V
Gate charge (Qg) (Max) @ vgs30 nC @ 5 V
Input capacitance (Ciss) (Max) @ vds1440 pF @ 25 V

Product details

30 V, 40 A N-channel — what the DPAK carries

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

The 11 mOhm Rds(on) at 20 A keeps conduction losses low in a 30 V rail — useful for load switches, low-voltage motor drives, or DC-DC converter synchronous rectification.

175 °C junction — field-repair margin

That 175 °C ceiling gives headroom in a cramped enclosure or under-hood environment where ambient can hit 105 °C and self-heating adds another 30–40 °C. The DPAK copper tab needs a good solder pad and via array to the inner-layer copper to keep the thermal resistance low.

That means STMicroelectronics has flagged it for eventual phase-out — no last-time-buy date is published in the available records, but new designs should not start with this part. Existing production can continue sourcing through independent distribution while stock lasts.

Frequently asked questions

Is STD40NF03LT4 obsolete or recommended for new designs?

It is not yet formally discontinued, but STMicroelectronics has flagged it for phase-out. New designs should select a current-production alternative; existing BOM lines can continue to source through independent distribution while inventory remains.

What is the replacement or equivalent for STD40NF03LT4?

A same-function N-channel MOSFET in DPAK with similar Vds (30 V), Id (40 A), and Rds(on) (11 mOhm range) from ST's current STripFET portfolio would be the logical cross-shop — confirm the gate charge and threshold voltage match the drive circuit before substituting.