Active TVS for 30.8 V rails — what the ratings mean
The STMicroelectronics SM15T36A is a 1500 W peak pulse power TVS diode from the TRANSIL™ SM15T series, designed to clamp transients on 30.8 V nominal rails. Its 34.2 V minimum breakdown voltage ensures the device starts conducting before the protected circuitry sees damaging overvoltage, while the 64.3 V maximum clamping voltage at the rated 156 A peak pulse current (8/20 µs waveform) limits the let-through energy.
1500 W peak pulse — sizing the protection budget
For a 30.8 V rail, this translates to a clamp that can handle substantial surge energy without failing short or open. The 156 A peak pulse current at 8/20 µs gives a quick reference for lightning-surge or ESD scenarios common in outdoor telecom and industrial I/O lines.
The SMC body provides adequate copper area for heat sinking during the pulse — ensure the PCB land pattern follows the recommended dimensions to keep the thermal impedance low. No special bake or MSL handling beyond standard moisture-sensitive-device precautions is indicated.