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onsemi 1.5SMC39AT3 — Circuit Protection

1.5SMC39AT3 onsemi Zener TVS – 1500W, 33.3V Standoff

MPN1.5SMC39AT3
Obsolete

onsemi 1.5SMC39AT3 Zener TVS diode, 1500W peak pulse power, 33.3V reverse standoff, 53.9V clamping, DO-214AB SMC package, single unidirectional channel.

$0.5800Ref. price · indicative, final on quote
onsemi 1.5SMC39AT3 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

1.5SMC39AT3 specifications
ParameterValue
TypeZener
MountingSurface Mount
Voltage - breakdown37.1V
Voltage - clamping (Max) @ ipp53.9V
Voltage - reverse standoff33.3V
Current - peak pulse (10/1000μs)28A
Power - peak pulse1500W (1.5kW)
Power line protectionNo
Operating temperature-65°C~150°C(TJ)
PackageTape & Reel (TR); Cut Tape (CT)
ApplicationsGeneral Purpose
CaseDO-214AB, SMC
Unidirectional channels1

Product details

1500W Zener TVS in DO-214AB — 33.3V standoff, 53.9V clamp

The 1.5SMC39AT3 is a single-channel unidirectional Zener TVS diode from onsemi, rated for 1500W peak pulse power at 10/1000µs. Its 33.3V reverse standoff voltage makes it a fit for protecting 24V DC rails, with a maximum clamping voltage of 53.9V at 28A peak pulse current.

Obsolete — sourcing via sealed factory reels

Onsemi has marked the 1.5SMC39AT3 as Obsolete. For BOM lines still calling this order code, the sourcing path is surplus inventory — sealed factory reels with consistent date-codes are the preferred grade.

Surface-mount SMC package with a copper pad area under the cathode tab that directly affects thermal resistance.

Frequently asked questions

Can 1.5SMC39AT3 be used for 24V applications?

Yes — the reverse standoff voltage is 33.3V, which is above a nominal 24V rail, so the diode will not conduct during normal operation. The 53.9V clamp provides a reasonable margin for typical 24V system transients.

What is the difference between 1.5SMC39AT3 and 1.5SMC39A?

The 'T3' suffix indicates tape-and-reel packaging. The 1.5SMC39A is the base device without the packaging suffix; electrically they are identical. Both share the same 33.3V standoff, 53.9V clamp, and 1500W rating.