45V Zener TVS in DO-214AA SMB
The SMBJ45A-13-F: Its 45V reverse standoff voltage means it stays transparent below the normal operating voltage, only conducting when a surge pushes the line above 50V breakdown minimum. The 72.7V max clamping voltage limits the peak voltage seen by downstream components during a 8.3A peak pulse current event — a 10/1000µs waveform typical of lightning-induced surges or inductive load dumps.
600W peak pulse power and unidirectional protection
The single unidirectional channel protects one signal or power rail — the cathode band identifies the anode-to-ground orientation. Surface mount assembly suits automated pick-and-place, with the SMB footprint common across 600W TVS families.