What the clamping specs mean for protection design
The 1.5SMC82A_R1_00001: The 70.1V reverse standoff is the voltage the diode presents to the line under normal operating conditions — the circuit sees this as the working rail ceiling before the device begins to conduct. The minimum breakdown of 77.9V sits above the standoff by roughly 11 percent — that margin keeps the diode fully off under normal operation and ensures turn-on is clean and predictable when the transient arrives. Unidirectional polarity means it clamps one polarity only; the reverse-bias direction handles the surge and the forward direction contributes negligible drop. Junction temperature rating runs to 150°C — this gives the thermal headroom for clamping events without the part self-destructing on a hot board, which matters in enclosed enclosures or near heat-generating components.
Package and SMT assembly fit
The DO-214AB (SMC) package is the mid-power TVS footprint — the cathode bar is the anode electrically in a Zener TVS, and the wide metallization pad on the tab carries heat away from the junction during a clamping event. Surface-mount termination suits reflow assembly; the Tape & Reel packaging confirms pick-and-place compatibility.