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STMicroelectronics SMCJ70CA-TR — Circuit Protection

STMicroelectronics SMCJ70CA-TR TVS Diode

MPNSMCJ70CA-TR
Active

STMicroelectronics SMCJ, TRANSIL™ series, Type Zener, Bidirectional Channels 1, Voltage - Reverse Standoff (Typ) 70V, Voltage - Breakdown (Min) 77.8V, Voltage - Clamping (Max) @ Ipp 146V, Current - Peak Pulse (10/1000µs) 69A (8/20µs), Power - Peak Pulse 1500W (1.5kW), DO-214AB, SMC package, Surface Mount, Operating Temperature -55°C~150°C(TJ).

$0.6500Ref. price · indicative, final on quote
STMicroelectronics SMCJ70CA-TR datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SMCJ70CA-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); Cut Tape (CT)
ApplicationsGeneral Purpose
CaseDO-214AB, SMC
Bidirectional channels1

Product details

1500W bidirectional TVS for 70V rail protection

The STMicroelectronics SMCJ70CA-TR is a 1500W bidirectional transient voltage suppression (TVS) diode from the SMCJ TRANSIL™ series, designed to protect sensitive electronics from voltage transients induced by lightning, inductive load switching, and electrostatic discharge. It is a general-purpose protection device suited for industrial, telecom, and automotive environments where a 70V nominal rail needs clamping to 146V maximum during a surge event.

When a transient exceeds 77.8V (minimum breakdown voltage,), the device starts to avalanche and clamp. The bidirectional nature means the same device protects both positive and negative transients, saving board space compared to two unidirectional diodes back-to-back.

The SMCJ70CA-TR is supplied in the DO-214AB (SMC) surface-mount package.

Frequently asked questions

Can SMCJ70CA-TR be used for 24V protection?

No. The reverse standoff voltage is 70V, which is the maximum continuous voltage the device can block. For a 24V rail, a TVS with a standoff voltage of 24V to 30V would be appropriate.

What is the difference between SMCJ70CA-TR and SMCJ70A?

SMCJ70CA-TR is bidirectional, protecting both positive and negative transients, while SMCJ70A is unidirectional, clamping only one polarity. For AC lines or bipolar rails, the bidirectional version is the correct choice.