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STMicroelectronics STD13003T4 — Discrete Semiconductors

STD13003T4 NPN Power Transistor, 400 V, 1.5 A, DPAK

MPNSTD13003T4
Active

STMicroelectronics STD13003T4 NPN bipolar power transistor, 400 V Vce breakdown, 1.5 A collector current, 20 W max power dissipation, DPAK (TO-252) surface-mount package.

$0.8700Ref. price · indicative, final on quote
STMicroelectronics STD13003T4 datasheet (PDF)
PackagingTO-252-3, DPak (2 Leads + Tab), SC-63
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

STD13003T4 specifications
ParameterValue
MountingSurface Mount
FET typeNPN
Voltage - collector emitter breakdown400 V
Current - collector (Ic)1.5 A
DC current gain (hFE) (Min) @ ic, vce5 @ 1A, 2V
Power - max20 W
Operating temperature150°C (TJ)
PackageTape & Reel (TR) Cut Tape (CT)
CaseTO-252-3, DPak (2 Leads + Tab), SC-63
Vce saturation (Max) @ ib, ic3V @ 500mA, 1.5A

Product details

400 V NPN in DPAK — offline flyback workhorse

The STMicroelectronics STD13003T4 is an NPN bipolar power transistor rated for 400 V collector-emitter breakdown and 1.5 A continuous collector current, housed in a DPAK (TO-252) surface-mount package.

Vce(sat) and conduction loss — what 3 V at 1.5 A means

The saturation voltage is 3 V maximum at 1.5 A collector current with 500 mA base drive.

DC current gain — hFE floor at 1 A

Minimum DC current gain is 5 at 1 A collector current with 2 V Vce.

DPAK footprint and reflow considerations

The DPAK (TO-252) package has three leads plus a large tab.

STMicroelectronics lists the STD13003T4 as an active product with ROHS3 compliance.

Frequently asked questions

Is STD13003T4 obsolete?

No, STD13003T4 is listed as an active product by STMicroelectronics. No discontinuation notice is in effect, and it remains ROHS3 compliant.

What is the maximum collector current for STD13003T4?

The maximum continuous collector current is 1.5 A. Pulsed current can be higher, but the datasheet should be consulted for pulse conditions.

Is STD13003T4 equivalent to MJE13003?

MJE13003 is a through-hole TO-126 package version of the same basic die. The STD13003T4 is the surface-mount DPAK variant. Electrical specs (400 V, 1.5 A) are similar, but the packages are not pin-compatible — the MJE13003 has a different lead form and mounting method.