TCA9548ARGER

TCA9548ARGER is the VQFN-24 (RGE, 4 × 4 mm) variant of Texas Instruments' 8-channel I2C/SMBus switch — for multiplexing one I2C bus to eight downstream buses in roughly one-third of the TSSOP footprint. The switch resolves the classic fixed-address conflict: sensors that cannot coexist on one bus each get their own channel, and the control register can enable any combination of channels simultaneously — with one limit: same-address devices must still be accessed one channel at a time, isolated per channel, because enabling their channels together recreates the address clash instead of clearing it. Three address pins allow up to eight TCA9548A devices on one bus, with voltage translation between 1.65 V and 5.5 V domains and a hardware reset input. Selection advice: the RGER code denotes the 4 × 4 mm VQFN on tape and reel — a different land pattern from the TSSOP-24 TCA9548APWR and the VSSOP-24 TCA9548ADGSR on this site, so match the code to the footprint your layout was qualified with; the die and register map are identical across the three packages (TI datasheet, Rev. H).