1500W surge rating, DO-214AB footprint
The SMCJ24A-13: The 38.9V maximum clamping voltage at 38.6A peak pulse current (10/1000µs waveform) means a downstream 40V-rated DC-DC converter or load switch sees a voltage well within its abs-max rating during a surge event. Housed in the DO-214AB (SMC) package, the part is surface-mount and occupies the standard SMC footprint — the same pad layout used across the SMCJ series, so a single PCB land pattern serves the full voltage range from 5V to 170V standoff. The 26.7V minimum breakdown voltage gives a guard band above the 24V rail before the diode starts conducting leakage current.
Unidirectional clamp, 150°C junction rating
This is a single-channel unidirectional Zener TVS. The 38.9V clamp voltage at the rated 38.6A peak pulse current defines the protection level — a 24V bus with a 10% tolerance sits at 26.4V max, leaving 12.5V of headroom before the clamp fires. Operating temperature range spans -55°C to +150°C junction. The 150°C TJ ceiling suits the part for outdoor telecom cabinets or under-hood automotive auxiliary circuits where ambient temperatures reach 85-105°C and self-heating from repetitive surges adds margin.