36V rail protection — breakdown and clamping
The SMBJ36AE3/TR13: This Microchip Zener TVS is selected for protecting a 36V nominal rail. The reverse standoff voltage is 36V, meaning the diode does not conduct at the working voltage. Breakdown occurs at 40V minimum, giving 4V headroom above the rail before the diode starts clamping. Clamping voltage at the peak pulse current of 10.3A (10/1000µs waveform) is 58.1V maximum. That is the voltage the protected circuit must survive — if the downstream device's absolute maximum is below 58.1V, this TVS may not protect it.
600W surge capability and temperature range
Rated 600W peak pulse power for the 10/1000µs waveform. This is a standard secondary-protection rating for industrial control, telecom, and power-supply outputs where the surge source is a coupling capacitor or a short cable discharge. That covers outdoor enclosures, engine-bay electronics, and cold-storage environments without derating at the extremes.
Microchip lists the SMBJ36AE3/TR13 as Active. DO-214AA (SMB) is a common surface-mount package. The '' suffix in the base number denotes lead-free / RoHS-compliant plating. Confirm the BOM's RoHS requirement — this part meets it.