53V standoff, 85V clamp — what that means for the circuit
The 1.5SMC62AS_R1_00001: The reverse standoff of 53 V defines the working voltage the TVS sees in normal operation; the part does not conduct until the transient pushes the line above this level.
The 1.5 kW peak pulse rating places this in the medium-power TVS class — enough for inductive kick on a DC rail, not for AC line directly. Because power-line protection is flagged as No, this is a board-side clamp, not a front-end AC suppressor: the designer routes it across the supply rail close to the connector so the transient is dealt with before it travels into the board.
For a TVS the clamping voltage shifts with temperature, so a 150°C Tj budget means the part handles self-heating during a long-duration clamp without derating below the hold-off voltage — important in systems that see thermal soak or solar loading on the enclosure.
DO-214AB SMC package and second-source reality
The SMC (DO-214AB) package is the industry-standard footprint for 1.5–3 kW TVS families across multiple manufacturers. The base product number 1.5SMC is the series identifier — voltage variants in the same package exist across the family, so a pin-compatible alternative at a different standoff voltage can often be cross-referenced without a board spin. Confirm the exact standoff and clamping specs before substituting.
Listed as Active by Panjit International Inc. For a general-purpose board-level TVS in a standard package, multi-source alternatives exist — qualify the alternate now if the BOM line has no second-source hedge.