What the 287.7V clamp means for your rail
The 1.5KE200: Its 171V reverse standoff voltage means it sits across a 170V DC bus without conducting leakage; when a transient exceeds the 180V minimum breakdown, it clamps at 287.7V maximum, shunting up to 5.5A of surge current to protect downstream silicon. The 1500W rating at 25°C derates with temperature — at 175°C junction the power capability drops to near zero, so the thermal path from the DO-201 body to the board is what actually determines surge survivability in a hot enclosure.
DO-201 axial package — board-fit reality
The DO-201AA (DO-27) axial-leaded package is a through-hole form factor that requires a drilled PCB with 1.0mm to 1.3mm hole diameter per the package drawing. The body diameter is about 5.3mm and the overall length including leads is roughly 9.1mm — this footprint has been standard for decades, so the replacement part will share the same hole pattern if it stays in the same package. Tape & Reel packaging means the axial leads are formed and taped for automatic insertion — verify the lead spacing on the reel matches your insertion machine's feed pitch before committing to a reel quantity.
Temperature range and application limits
The spec explicitly states 'Power Line Protection: No' — this is a signal-line or low-voltage DC bus protector, not a mains AC surge suppressor. Do not use it on 120/240VAC power entry without additional series impedance and coordination with upstream overcurrent protection.
Obsolete — what that means for procurement
Sourcing is through independent distribution — surplus inventory, new-old-stock, or broker channels. Availability is lot-specific and confirmed at RFQ time.