1500 W surge clamp for 376 V rails
The 1.5SMC440AHM3_A/H: With a 376 V reverse standoff voltage and 418 V minimum breakdown, it clamps transients to 602 V maximum at 2.5 A peak pulse current, protecting downstream silicon on 380 VDC or 277 VAC rails from lightning-induced surges and inductive load dumps.
Automotive grade and operating envelope
AEC-Q101 qualification means this part meets the automotive stress tests for temperature cycling, high-temperature reverse bias, and ESD robustness — suitable for under-hood and chassis-mounted ECU power inputs, battery management systems, and 48 V mild-hybrid bus protection.
DO-214AB SMC package and board fit
No power line protection (unidirectional only); the single-channel Zener structure responds in picoseconds to avalanche breakdown.
Active lifecycle and supply posture
The base product number 1.5SMC440 covers the full family; the HM3 suffix denotes the AEC-Q101 automotive grade and the A/H tape-and-reel packaging variant.