70V rail clamp — unidirectional, one channel
Its 70V reverse standoff voltage means it sits across a 70V DC rail and stays off until a transient pushes past the 77.8V minimum breakdown. When it fires, the clamp holds at 113V maximum while shunting 5.3A of peak pulse current in the 10/1000µs waveform.
DO-214AA (SMB) — surface-mount, field-swappable with hot air
Housed in a DO-214AA (SMB) package, this is a two-terminal surface-mount part. Polarity is marked on the body — cathode band toward the positive rail for unidirectional clamping. You can swap it on site with a hot-air station; the SMB footprint is common enough that the pad layout matches many standard TVS diodes in this power class. No special handling beyond normal ESD precautions.
Microchip lists the SMBJ70AE3/TR13 as Active. The base product number is SMBJ70; the 'AE3' suffix indicates the unidirectional version with the standard Microchip screening level.
This covers military-grade cold and hot environments — avionics bays, outdoor telecom cabinets, engine compartments. The wide range does not derate the peak pulse power; the 600W rating holds across the full temperature band unless the datasheet derating curve says otherwise.