The QS3383QG is a Bus FET Exchange Switch from Renesas, configured as 5 independent 2:2 mux channels (5 x 2:2 circuit). It routes digital signals between two buses under a single control per channel — think of it as a set of five SPDT switches that can swap or isolate bus lines without adding propagation delay. It runs from a single 4.75V to 5.25V supply, so it drops straight into a 5V logic rail. Package is a 24-QSOP (the 0.154-inch wide, 3.90mm body variant), which is a hand-solderable footprint if you're careful with a fine tip and flux.
The 4.75V to 5.25V supply range is tight — 5V ±5%. If your rail droops below 4.75V under load, the switch may not guarantee the on-resistance or signal integrity. Budget a local 5V regulator or a low-drop post-filter if the board's 5V bus is shared with motors or relays. The QS3383QG is not AEC-Q100 listed, so it's not qualified for engine-bay or chassis-domain automotive use — keep it in the cabin or infotainment if you're pushing that boundary.
No lead-free exemption to track.