The NXP PCA9547PW,118 is an 8-channel I²C/SMBus translating multiplexer in a 24-TSSOP package. It lets a single I²C or SMBus master communicate with up to eight separate bus segments, each with its own pull-ups and address space, while providing voltage-level translation between the two supply domains. Typical applications include server motherboards, baseband controllers, multi-sensor arrays, and any design where I²C address conflicts or voltage-level mismatches need a clean hardware solution.
Dual supply — the decision parameter
That dual-domain architecture is what makes it a translating multiplexer — the logic-side voltage can be 3.3 V while the bus-side segments run at 5 V, or any combination within those windows. For a BOM engineer, this means one part handles both the channel expansion and the level shift, saving a separate translator IC and its associated PCB area.
Package and mounting — 24-TSSOP
Housed in a 24-TSSOP body measuring 4.40 mm wide, the PCA9547PW,118 is a surface-mount device intended for standard reflow assembly.