1500W transient suppressor for 185V rails
The 1.5SMC220CA: This is the part that clamps transients on a 185V nominal rail — the reverse standoff voltage (:185V) is the continuous DC or peak AC voltage the protected line sees under normal operation, and the breakdown triggers at 209V minimum (:209V). When a surge hits, the device clamps at 328V maximum (:328V) while conducting 4.6A peak pulse current (:4.6A). The 1500W rating tells you the energy the part can absorb in a single pulse — enough for industrial power supplies, motor drive DC buses, or telecom rectifiers where the transient energy is moderate but repetitive.
Bidirectional clamping for AC or polarity-agnostic lines
That matters when the protected line carries AC or when field wiring polarity is not guaranteed — one part covers both directions without needing a series pair. The DO-214AB SMC footprint (:DO-214AB, SMC) is the standard large-body SMD package for 1.5kW TVS diodes; the cathode band is marked for orientation even though the bidirectional construction is polarity-insensitive.
Active production — no last-time-buy pressure
That means Littelfuse is still manufacturing it — no end-of-life notice, no last-time-buy deadline to track. The 1.5SMC series is a standard catalogue line with broad distribution coverage, so multi-source availability is the norm. Cut Tape (CT)), so it fits both high-volume reel-fed pick-and-place and prototype or repair bench orders. No special handling — standard MSL for SMC packages, store below 30°C in the original moisture barrier bag.