Obsolete — last-time-buy window closed
The 1.5KE220CHE3/73: No pin-compatible replacement from Vishay is documented.
AEC-Q101 TransZorb — what the ratings mean for the BOM
The 175 V reverse standoff voltage means the diode stays transparent on a nominal 175 VDC bus and only clamps above that threshold. Breakdown voltage min is 198 V, so the device starts conducting between 198 V and the clamp limit.
DO-201AA axial — board-fit note
Through-hole DO-201AA (DO-27) axial package — the leads are formed for through-hole insertion; the body is 5.3 mm diameter typical. No surface-mount variant exists in this order code.