Clamping and Breakdown — What the Ratings Mean for the Board
The 1.5KE250AE3/TR13: The minimum breakdown voltage is 237V, guaranteeing the protection threshold starts before the junction is damaged. At the rated 5A peak pulse current (IPP at 10/1000µs), the clamping voltage is clamped to 344V maximum. This means a transient exceeding 214V is shunted to ground, and the voltage across the protected load never exceeds 344V under the specified surge condition.
DO-201AA Axial Package — Through-Hole Integration
Housed in the DO-201AA (DO-27) axial-lead package, the 1.5KE250AE3/TR13 is a through-hole device intended for point-to-point wiring or PCB mounting with 0.042-inch diameter leads. The CASE-1 supplier device package is the standard Microsemi designation for this body style. The Tape & Reel (TR) packaging option is suited for automated insertion equipment, though the obsolete status means reel quantities are limited to existing surplus inventory.
Sourcing an Obsolete Part — What to Expect
Any functional replacement would require verifying the breakdown voltage, clamping voltage, and package footprint against the original BOM specification.