The 1.5KE200A-E3/51: Vishay has marked the 1.5KE200A-/51 as Last Buy — the manufacturer is winding down production, and the window to secure inventory through standard distribution is closing. For a BOM that depends on this TVS, the procurement decision is now time-sensitive: once the last-buy period ends, the only channel will be independent surplus or broker inventory.
Clamping performance for a 171V rail
This is a unidirectional TransZorb® TVS diode with a 171V reverse standoff voltage — it sits across a DC bus or signal line rated up to 171V and stays out of conduction during normal operation. When a transient exceeds the 190V minimum breakdown voltage, the device clamps at 274V maximum (at the 5.5A peak pulse current, 10/1000µs waveform), shunting the surge energy to ground. For a 274V clamp, the device can absorb a 5.5A surge before the junction temperature exceeds the safe operating area — a typical fit for protecting 170V DC buses, telecom line cards, or industrial power supplies against lightning-induced or inductive-load transients. The DO-201AA axial-lead package (also known as DO-27) is through-hole — rework-friendly with a soldering iron or hot-air station, and the large body dissipates heat well during repetitive surge events.