8-TSSOP footprint and supply rails
The SN74CBT3306PWR is a 74CBT-series bus switch with two independent 1:1 circuit channels, each controlled by a separate enable pin. The 5 V Vcc also sets the switch's on-state resistance and bandwidth — at 5 V the typical Ron is around 5 Ω, low enough to pass 5 V logic levels with minimal attenuation.
The two independent channels let one IC isolate two separate signal paths (e.g., SPI chip-select and data lines) without a second package.