1500 W peak pulse — what it means for the rail
The 1.5SMC43 is a Littelfuse Zener TVS diode from the 1.5SMC series, rated for 1500 W peak pulse power at 10/1000 µs waveform.
Obsolete — sourcing reality for sustainment
For BOM sustainment on existing designs, this part is sourced through independent distribution channels — quantities are lot-specific and confirmed at RFQ. A pin-compatible functional replacement from the same 1.5SMC series with the same standoff voltage may exist, but no direct cross-reference is recorded here — each replacement candidate must be verified against the original clamping and breakdown specs.
The package footprint is standard for 1500 W TVS diodes — the same pad layout serves many alternate parts if a second-source is needed. The wide range means derating for ambient temperature is minimal in most indoor or engine-bay applications.