Clamping voltage and surge rating for the rail
The 1.5SMC120CA-E3/57T: The 102 V reverse standoff voltage means it sits across a DC bus or signal line up to that level without conducting leakage current; when a transient exceeds 114 V breakdown minimum, the device clamps at 165 V maximum while shunting 9.1 A peak pulse current. The bidirectional channel protects both positive and negative transients with a single component, which halves the component count on a bipolar rail compared to back-to-back unidirectional diodes.
Thermal and package fit for the board
The DO-214AB (SMC) surface-mount package is the standard footprint for this power class — the same pad layout serves the entire 1.5SMC family, so a single copper land pattern covers the full voltage range from 5.0 V to 220 V. No power line protection feature is built in — this is a pure transient suppressor, not a filtered EMC protector. The tape-and-reel packaging (/57T suffix) feeds directly into a pick-and-place line for high-volume assembly.
Active lifecycle and sourcing posture
The 1.5SMC120CA-/57T carries an active product status from Vishay, which means no end-of-life notice is in effect and the part remains eligible for new designs.