What this TVS protects and where it sits on the board
The SMCJ100CAE3/TR13: Reverse standoff voltage is 100 V, meaning the protected line can run at 100 V DC or 70 V AC RMS continuously; the TVS stays off until the transient pushes past the 111 V minimum breakdown threshold. When it fires, clamping voltage holds at 162 V max at the rated 9.3 A peak pulse current — the downstream silicon sees no more than that before the surge decays.
Housed in a DO-214AB (SMC) surface-mount package — the same footprint as the standard SMCJ series. The copper tab on the bottom side conducts heat to the PCB pad; a 30 mm² copper plane under the part keeps the junction temperature rise within limits during repetitive surges.