What this TVS diode does in the circuit
The AEC-Q101 qualification confirms it for automotive-grade applications, and the -65°C to 150°C junction temperature range covers under-hood and outdoor environments.
Key ratings that drive your BOM decision
The 111V reverse standoff voltage sets the continuous DC operating level — your rail must stay below this to avoid leakage. Breakdown voltage min is 124V, and the clamping voltage max is 179V at 3.3A peak pulse. The 170pF capacitance at 1MHz matters for signal integrity on fast data lines; higher capacitance loads the line and can round edges on high-speed interfaces like CAN or LIN.
onsemi lists the P6SMB130AT3 as Obsolete. The DO-214AA (SMB) package is common across the P6SMB family, so a cross to a similar onsemi part (e.g., P6SMB130A) or a Littelfuse/SMC equivalent in the same footprint may be possible — confirm the breakdown and clamping voltages match your design margin.