What this I²C / SMBus translating switch does on your board
The PCA9546APWR is an I²C / SMBus translating switch that connects multiple downstream buses to a single upstream controller, isolating each channel. Housed in a 16-TSSOP package (4.40 mm width), it's a surface-mount part that reworks fine with hot air if you've got a steady hand and the right nozzle. No lab bench needed — just a standard iron and some flux for the field swap.
Active lifecycle — no LTB panic, no successor hunt
ROHS3 compliant out of the gate, which clears the EU and most global regulatory gates without extra paperwork.