Device identity — Zener TVS diode, 1.5SMC family
The 1.5SMC56A_R1_00001: The reverse standoff voltage is 47.8V — this is the maximum DC or AC voltage the device can endure without conducting in normal operation. Breakdown occurs at a minimum of 53.2V, and the clamping voltage at rated current is 77V, meaning the protected rail sees no more than 77V during a surge event.
Package and board-fit — DO-214AB SMC
CT suits prototype or low-quantity builds.
Temperature range and reliability
The wide range means the device maintains clamping performance across thermal extremes, from cold-start conditions to hot engine bays. The part does not include power line protection — it is a standard TVS for signal or low-voltage DC rails, not for mains AC line clamping.
No official second-source or pin-compatible cross-reference is recorded — the 1.5SMC series is Panjit's own and the replacement path, if ever needed, would be a parametric match from the same series.