1.5 kW peak pulse, 78 V standoff — the clamping margin for a 48 V or 60 V rail
The SMCJ78CA-13: The minimum breakdown voltage is 86.7 V, so the device starts conducting well above the 78 V standoff and below the 126 V clamp — a clean snap-back characteristic typical of Zener TVS diodes.
DO-214AB SMC — board footprint and thermal path
Housed in the DO-214AB (SMC) package, the SMCJ78CA-13 is a surface-mount device with a large copper tab on the cathode side for heat sinking. Operating temperature range is -55 °C to +150 °C junction, covering automotive under-hood and industrial enclosure environments without derating at the high end.
