1500 W surge clamp for 12 V automotive rails
The 1.5SMC15CAHM3_A/H: The 12.8 V reverse standoff voltage sits below the nominal 13.8 V alternator output, so the diode stays transparent during normal operation and only conducts when a transient pushes the line above the 14.3 V minimum breakdown threshold.
Clamping voltage and peak current — what the ratings mean for your BOM
The single-channel layout is a straightforward parallel connection across the supply rail. The -65°C to +150°C junction temperature range covers cold-crank starts and under-hood heat soak — the leakage current at 150°C is higher than at 25°C, but the clamping voltage stays within the datasheet limits across the full band.