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STMicroelectronics SM15T68CA — Circuit Protection

STMicroelectronics SM15T68CA TVS Diode, 1500W, Bidirectional

MPNSM15T68CA
Active

STMicroelectronics SM15T68CA, TRANSIL™ series, Bidirectional TVS Zener Diode, 1500W Peak Pulse Power, 58.1V Reverse Standoff, 121V Clamp, DO-214AB SMC Package.

$1.0600Ref. price · indicative, final on quote
STMicroelectronics SM15T68CA datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SM15T68CA specifications
ParameterValue
TypeZener
SeriesSM15T, TRANSIL™
MountingSurface Mount
Voltage - breakdown64.6V
Voltage - clamping (Max) @ ipp121V
Voltage - reverse standoff58.1V
Current - peak pulse (10/1000μs)83A (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 in a DO-214AB package

It delivers 1500W peak pulse power (1.5kW) per the 10/1000µs waveform, with a reverse standoff voltage of 58.1V and a maximum clamping voltage of 121V at the peak pulse current of 83A (8/20µs waveform).

The 58.1V reverse standoff voltage means the SM15T68CA can sit on a 48V nominal bus (such as a 48V telecom or PoE rail) without conducting during normal operation. The minimum breakdown voltage of 64.6V provides a guard band of about 6.5V above the standoff, ensuring the diode does not clip during steady-state transients or ripple.

Frequently asked questions

What is the difference between SM15T68CA and SM15T68?

The SM15T68CA is the bidirectional version of the SM15T68, which is unidirectional. The bidirectional variant is suited for AC lines or where the polarity of the surge is unknown, while the unidirectional version is typically used on DC rails where the cathode is tied to the positive rail.

Can SM15T68CA be used for 48V systems?

Yes, with a reverse standoff voltage of 58.1V, the SM15T68CA is a standard choice for protecting 48V nominal buses, such as telecom rectifiers or PoE power supplies, as it will not conduct during normal operation.