The 1.5SMC91CA-M3/57T: The reverse standoff of 77.8 V defines the continuous working voltage the diode holds off without conducting — the protection window sits above that line and fires before the load reaches 125 V. Junction temperature runs to 150 °C — the SMC body thermal resistance and the duty cycle of repeated transients set the margin against that ceiling. For a board-level designer, the -65 °C cold start means the part is qualified for outdoor enclosure or equipment that sees deep-freeze storage before power-up.
TransZorb® in the 1.5SMC family
The CA suffix marks the bidirectional polarity variant in this series — the diode clamps on both polarities without a separate reverse-connected part. Surface-mount termination in the DO-214AB (SMCJ) package matches the standard footprint for this power class, so the existing land pattern on a board already built for a sibling 1.5SMC part accepts this part directly. Tape-and-reel packaging is the standard reel format for high-volume SMT assembly — confirm the pick-and-place nozzle diameter suits the SMC body profile before committing to the line.