Clamping window and rail protection
The 1.5KE18CAHA0G: The 15.3V reverse standoff voltage means the diode draws negligible leakage current below that level — it sits across a 12V or 15V supply rail without loading it. When a surge exceeds 17.1V (minimum breakdown), the device enters avalanche and clamps the transient to 25.5V maximum, protecting downstream silicon rated for 30V or higher. The 60A peak pulse current rating at 10/1000µs is the surge it can absorb once without degradation — useful for ISO 7637-2 pulses in automotive 12V systems or industrial 24V DC rails.
Package and board-fit
Through-hole DO-201AA (DO-27) axial package with a DO-201 supplier device code. The 0.052-inch lead diameter fits standard 1.0mm PCB holes; the body is 9.1mm long, so it stands off the board when inserted fully. Tape-and-box packaging (TB) is the standard reel-less format for axial diodes — the leads are taped to a carrier strip, not wound on a reel, which suits low-volume kitting or hand-insertion lines.