Key electrical ratings and what they mean for clamping
The 1.5KE400CA-E3/54: The reverse standoff voltage (working voltage) is 342V; the device remains transparent below that level and starts clamping once the transient exceeds the breakdown threshold of 380V min. The junction temperature range spans -55°C to 175°C, covering most industrial and automotive ambient conditions without derating concerns.
Supplied in a DO-201AA (DO-27) axial-lead package, through-hole mount. The two-lead body is identical in footprint for either polarity orientation — the bidirectional construction means no cathode band distinction, simplifying insertion on the line.