1.5 kW TransZorb clamping profile
The 1.5KE43CA-E3/51: The reverse standoff voltage of 36.8 V means it sits across the supply line without conducting during normal operation; the minimum breakdown voltage of 40.9 V is the threshold where avalanche conduction begins. Under a 10/1000 µs surge waveform, the clamp voltage peaks at 59.3 V while shunting up to 25.3 A — that 59.3 V ceiling is what the downstream silicon must survive. The DO-201AA axial-lead package is a through-hole form factor that handles the thermal pulse of a 1.5 kW surge without lifting the die bond.
Last-buy — sourcing the 1.5KE43CA-E3/51 now
Vishay has flagged this part as Last Buy — the manufacturer is winding down production, so the window for factory orders is closing. For BOM lines already qualified to this specific Vishay order code, the practical path is to secure inventory through independent distribution while the part is still available on the surplus market.