64V reverse standoff, 500 W peak pulse — SMAJ64CE3/TR13
Its Zener breakdown triggers at a minimum of 71.1 V, and the clamping voltage at the 4.4 A peak pulse current (10/1000 µs waveform) is 114 V max. That 114 V ceiling is the number to check against your downstream device's absolute maximum rating — if the clamped spike still exceeds the load's tolerance, you need a higher-power or lower-clamp part.
Active production — no near-term EOL risk
Microchip lists the SMAJ64CE3/TR13 as Active.
DO-214AC (SMA) — surface-mount footprint, 500 W in a small package
The DO-214AC (SMA) package is a standard JEDEC outline for 500 W TVS diodes. The mounting pad footprint is well established in PCB libraries — no unusual land pattern.