Bus switch for 5V signal paths
The SN74CBT3245CPW: It connects or isolates digital signal paths under the control of a single output-enable pin, with the switch pass transistor presenting minimal propagation delay.
The 4V to 5.5V supply window means this switch is designed for 5V nominal rails, not 3.3V or lower. If the design runs a 3.3V bus, the switch's on-state resistance and signal swing will not match the datasheet's characterized performance — a 5V-tolerant bus switch from the 74CBTLV or 74LVC family would be the correct tier. The single-supply sourcing also simplifies the power tree: no separate VCC and VDD rails to route.
Housed in a 20-TSSOP (4.40 mm width) package, the SN74CBT3245CPW occupies a compact footprint for dense PCB layouts.
The active status removes any urgency to qualify a drop-in alternate today, but maintaining a second-source qualification on a functionally equivalent 8-bit bus switch in the same package is standard supply-chain hygiene for production builds.