Active production — what that means for a BOM line
The 1.5KE250A-E3/73: The 237V minimum breakdown voltage gives the protection window a predictable turn-on threshold.
Field-swappable package — no lab bench needed
Through-hole DO-201AA / DO-27 axial package — the leads are long enough to dress into a board or terminal block, and the body is clearly marked with the polarity band. A soldering iron and a pair of cutters are all you need to swap it on site.
Unidirectional Zener — one channel, one job
Single unidirectional channel — the cathode band identifies the anode-to-ground orientation. No power-line protection means it is designed for signal or DC rail clamping, not AC mains. The TransZorb series is Vishay's branded TVS family, optimized for repetitive surge clamping with fast response time. General-purpose application means it fits across power supplies, I/O lines, and DC buses.