The SMCJ78CAE3/TR13 is a bidirectional Zener TVS diode from Microchip Technology, rated for 1500W peak pulse power (10/1000µs waveform). Its minimum breakdown voltage of 86.7V and maximum clamping at 126V define the protection window for a 78V nominal rail. The 11.4A peak pulse current tells you the surge it can sink before the clamp rises above 126V. Bidirectional construction means it clamps equally on positive and negative transients — useful on AC signal lines or bipolar DC buses where polarity isn't fixed.
Active production – no LTB scramble needed
Microchip lists the SMCJ78CAE3/TR13 as Active. If you already have a layout for a 1.5kW SMCJ TVS, this part drops in without a pad revision.
That covers automotive underhood, outdoor telecom cabinets, and industrial enclosures where ambient heat soaks above 85°C. The 1500W rating is derated above 25°C per the standard TVS derating curve — plan for reduced pulse energy at elevated case temperatures.