AEC-Q101 Transient Suppressor for 24V Automotive Rails
The 1.5SMC20CAHM3/I: The -65°C to +150°C junction temperature range covers cold-crank and engine-bay thermal extremes without derating the peak pulse power, a requirement for any ECU or BMS that sees both arctic start and summer soak conditions.
Clamping Voltage and Pulse Current — Sizing the Protection Window
At the 17.1 V standoff the diode draws negligible leakage current under normal operation; it only begins conducting when the transient exceeds the 19 V minimum breakdown voltage. The 27.7 V clamping ceiling at 54.2 A peak pulse current defines the voltage stress the protected load sees during a surge — a 24 V nominal bus with a 40 V abs-max input can survive this with margin. The DO-214AB (SMC) package's copper pad area on the PCB sets the thermal resistance to ambient and governs how much average power the part can handle in repetitive surge conditions.
Active Production — No End-of-Life Risk for Current Designs
The 1.5SMC20CAHM3/I shares the same die and package as the non-automotive 1.5SMC20CA, but only the HM3 suffix carries the AEC-Q101 qualification sticker required for automotive PPAP submissions.