Active AEC-Q101 TVS for 171V rails — what the ratings mean for fit
The 1.5SMC200CAHM3/H is an active-production bidirectional TVS from Vishay's 1.5SMC TransZorb® series, qualified to AEC-Q101 — the automotive-grade stress and reliability screening that covers temperature cycling, ESD, and latch-up immunity for under-hood and chassis-mounted electronics. Its 171V reverse standoff voltage sits below the 190V minimum breakdown threshold, meaning a 170V DC bus or a 120V AC rectified rail (with headroom for nominal tolerance) stays within the safe operating region until a transient pushes the voltage past the avalanche point.
Package and board-fit — DO-214AB (SMC) footprint
The DO-214AB (SMC) surface-mount package is the same footprint used across the 1.5SMC family, so a board already laid out for a 1500W SMC TVS accepts this part without a pad revision. The single bidirectional channel means one device protects both polarities on a signal or power rail — no need to pair two unidirectional parts back-to-back. Operating junction temperature spans -65°C to 150°C, covering the full automotive ambient range plus self-heating margin during a pulse.