200 W Zener TVS — protecting a 12 V rail in SOD-123F
With a reverse standoff of 12 V, breakdown at 13.3 V min, and clamping at 19.9 V max at 10.1 A (10/1000 µs pulse), it keeps the protected circuit below typical 20 V absolute-maximum ratings for downstream ICs on a 12 V bus. The SOD-123F package keeps the footprint small — about 2.6 mm × 1.6 mm — so it fits tight layouts on a 12 V input line or low-voltage DC bus where board space is at a premium.
A functional cross-reference within the same SMF series (same SOD-123F package, similar voltage rating) may exist — verify the breakdown and clamp voltages against the original design target before substituting.
The unidirectional channel (single Zener) clamps positive transients referenced to ground; it does not protect against negative-going spikes unless paired with a series diode or a bidirectional TVS.