Clamping performance for 18.8V rails
The 1.5SMB22CA: That 30.6V ceiling is what downstream silicon sees — if the protected device's abs-max rating sits above that, the TVS does its job. With a peak pulse power rating of 1500W (1.5kW), this part handles the surge energy typical of telecom line cards, where a lightning-induced transient can dump several hundred watts in a few microseconds. The DO-214AA (SMB) package keeps the thermal path short to the board copper, which is what actually sinks the pulse heat.
Package and rework reality
The cathode band is clearly marked on the body — no ambiguity about orientation when placing or reworking. Under hot air, the SMB body heats evenly; the leads wet out quickly with a standard SAC305 profile. It survives multiple reflow cycles without cracking the junction passivation, as long as the peak temperature stays within the JEDEC moisture sensitivity level the part is rated for.
Active production — no end-of-life watch needed
Littelfuse lists the 1.5SMB22CA as Active in production. There is no NRND notice, no last-time-buy window, and no official successor — the part is a current catalog item.