What the 1.5 kW peak pulse rating means for your protection design
The 1.5KE22CA/54: That 1.5 kW rating means it can absorb a transient that would destroy a smaller suppressor, but the clamping voltage, not the power rating, determines whether the downstream device survives. With a breakdown voltage of 20.9 V minimum and a clamping voltage of 30.6 V at 49 A peak pulse current, this part protects 18.8 V nominal rails — the reverse standoff voltage — from overvoltage events up to that clamp ceiling. A 24 V bus or a 24 Vdc sensor supply sits within its protection window.
Housed in the DO-201AA (DO-27) axial-lead package, the 1.5KE22CA/54 is a through-hole part — it inserts into a 1.1 mm diameter hole on a standard PCB and is wave-soldered or hand-soldered. The axial leads let it sit flat against the board or stand off for better airflow, depending on the lead bend. The 175°C max junction allows the die to run hot during a surge without immediate failure, but the board-level thermal path — copper trace width and pad size — still governs how quickly the part cools between events.
Lifecycle reality — obsolete, but still sourced
The axial-lead DO-201AA package and the 1.5 kW TransZorb family are still widely stocked in the surplus and broker market, so supply is generally findable, but each lot should be verified for date code and authenticity before committing to a production run.