What the 8 x 2:1 configuration buys you on the bench
The 74FST32390Q is an 8-bit, 2-to-1 multiplexer — eight independent 2:1 mux stages in a single 28-pin SSOP or QSOP package. That means one chip replaces eight discrete 2:1 mux packages or a larger 16-pin octal mux, saving board area and routing complexity on a 5 V bus.
Package options and board-fit reality
Both are surface-mount, so reflow profile and stencil aperture matter for solder-joint reliability on the narrow leads. No separate analog or core supply needed.
Lifecycle and compliance — what the record says
RoHS non-compliant. If your assembly line or customer requires RoHS-10 exemption-free parts, this mux will not pass. For legacy boards or mil/aero builds that still use tin-lead solder, it is a drop-in replacement.
