8 V standoff, 13.6 V clamp — what that means for the protected rail
The 1.5SMCJ8.0A is a unidirectional TVS diode (type Zener per the spec table) in the DO-214AB (SMC) package — surface-mount, strip packaging. The reverse standoff of 8 V sets the maximum working voltage the line can sit at continuously without the TVS conducting. Anything above 8.9 V minimum breakdown starts to avalanche, and the clamping specification of 13.6 V max at the 10/1000 µs peak pulse current of 110 A tells you what the diode clamps the transient spike to when it fires — so downstream circuitry sees a 13.6 V ceiling rather than whatever the surge delivers. At 110 A through the 13.6 V clamp, the device is dissipating roughly 1.5 kW for that pulse window, which is the design point. Sustained over-voltage is not the use case — the TVS handles the transient and resets. Junction temperature range is -50°C to 150°C — wide enough for most industrial and automotive board-level protection roles. There is no power-line protection flag in the listing, so this part is not listed as a mains-fed line-protection device; it sits on a secondary rail or signal line.