What the clamping and breakdown ratings mean for your 22V rail
The 1.5SMBJ22CA: That 35.5V clamp defines the voltage stress the downstream components must survive — a 40V-rated capacitor or a 36V-rated IC on that rail has margin.
Package and board-fit: DO-214AA (SMB) surface mount
The SMB footprint is a common industry standard — the same pad layout used by many 1.5kW TVS diodes from Bourns and other manufacturers, so a board designed for a generic SMB TVS accepts this part without layout changes.