600 W TVS for 78 V rails
The SMBJ78A-13-F: Its 86.7 V minimum breakdown voltage and 126 V maximum clamping at 4.7 A (10/1000 µs waveform) define the protection envelope: the downstream equipment must survive up to 126 V for the pulse duration. The unidirectional channel (single device) protects one signal or power line. The 600 W rating at 10/1000 µs is the industry-standard pulse condition — derate for shorter or longer pulse widths per the datasheet's pulse-derating curve.
Package and integration
No power-line protection (it is a Zener TVS, not a steering-diode array) — this part is for unidirectional clamping on DC rails, not for AC mains or high-speed data lines.
For a BOM line requiring a 78 V unidirectional TVS in DO-214AA, this is the direct fit. Pricing and lead time are confirmed at RFQ against your line-item quantity.