CA9546 from Sensylink Microelectronics is a low-voltage 4-channel bidirectional I²C/SMBus switch with an active-low reset input. It allows a single upstream master to access any one or any combination of four downstream I²C/SMBus channels. An internal 8-bit control register enables flexible channel selection, while each channel can operate at different bus voltages such as 1.8 V, 2.5 V, 3.3 V, or communicate with 5 V devices using external pull-ups.

The active-low RESET pin allows the device to recover from stuck bus conditions by resetting the I²C state machine and deselecting all channels. The CA9546 supports Fast Mode+ operation up to 1.0 MHz, up to 8 slave addresses, 5.5 V-tolerant inputs, noise filtering on SCL/SDA lines, and hot-swap capability. It ensures glitch-free operation during power-up.

Available packages include SOP-16, TSSOP-16, and QFN4×4-16.

Ideal for server, notebook, and telecom applications.