Package and integration note
The 1.5KE10A-T is a through-hole Zener TVS diode in a DO-201AA (DO-27) axial package, supplied as Tape & Reel or Cut Tape. The DO-201 body is 5.3 mm diameter with 25.4 mm lead spacing — the axial leads require a 1.2 mm hole diameter on the PCB, and the copper pad area under the body sets the thermal impedance for pulse dissipation.
Clamping performance and surge rating
The reverse standoff voltage is 8.55 V, and breakdown occurs at 9.5 V minimum — this means a 12 V rail sees no clamping during normal operation, but a transient above 9.5 V triggers the avalanche and the diode shunts the surge to ground before the downstream IC sees the 14.5 V clamp.
For new designs, consider the 1.5KE10CA (bidirectional) or a current-production equivalent from the same 1.5KE family, but verify the clamping and standoff match the BOM requirement.