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STMicroelectronics SMCJ70A-TR — Circuit Protection

STMicroelectronics SMCJ70A-TR TVS Diode, 1500W, 70V Standoff

MPNSMCJ70A-TR
Obsolete

STMicroelectronics SMCJ, TRANSIL™, TVS Diode, Type Zener, 1500W (1.5kW) Peak Pulse Power, 70V Reverse Standoff, 146V Clamping, 1 Unidirectional Channel, DO-214AB SMC Package, -55°C~150°C Operating Temperature.

STMicroelectronics SMCJ70A-TR datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

SMCJ70A-TR specifications
ParameterValue
TypeZener
SeriesSMCJ, TRANSIL™
MountingSurface Mount
Voltage - breakdown77.8V
Voltage - clamping (Max) @ ipp146V
Voltage - reverse standoff70V
Current - peak pulse (10/1000μs)69A (8/20µs)
Power - peak pulse1500W (1.5kW)
Power line protectionNo
Operating temperature-55°C~150°C(TJ)
PackageTape & Reel (TR)
ApplicationsGeneral Purpose
CaseDO-214AB, SMC
Unidirectional channels1

Product details

TVS diode with 1500 W peak pulse capability — what it protects

It clamps voltage transients on a 70 V nominal rail, with breakdown starting at 77.8 V and clamping at 146 V at 69 A.

Voltage ratings and the clamping decision

The 70 V reverse standoff voltage sets the maximum continuous DC the rail can carry without conducting. The 77.8 V minimum breakdown ensures clamping before the rail exceeds its absolute maximum. The 146 V clamping at 69 A defines the surge survival voltage.

DO-214AB SMC package — footprint and reflow

The DO-214AB (SMC) package is a standard surface-mount outline for TVS diodes.

Frequently asked questions

What is the replacement for SMCJ70A-TR?

The SMCJ family (base product number SMCJ) includes other voltage variants in the same DO-214AB package, but a direct voltage-for-voltage substitute — 70 V standoff, 1500 W — would need to be evaluated from other manufacturers or from ST's own SMCJ70A (non-TR suffix) if still available through surplus. Cross-reference with a part like the Littelfuse SMCJ70A or Vishay SMCJ70A is common, but verify the clamping voltage and peak pulse current match your design margin.