17V standoff rail guard – DO-214AB SMC
The reverse standoff voltage of 17V means it sits across the rail without conducting at nominal, and only starts to avalanche at 18.9V breakdown minimum. When a surge hits, the clamping voltage holds at 27.6V maximum while shunting 53.3A of peak pulse current (10/1000µs waveform). That's a 1.5kW peak pulse power rating — enough to absorb the energy from a load-dump or lightning-induced transient on a 12V or 15V bus.
SMCJ17AE3/TR13 carries an Active product status from Microchip Technology. The BOM line is stable for current and near-term production runs. The DO-214AB (SMC) footprint is a standard JEDEC outline — no layout surprises.