8:1 analog mux with 240 Ohm Ron — signal routing for harsh environments
The CD4051BPW: The 240 Ohm max on-resistance sets the insertion loss and bandwidth floor for the signal path — at 20 MHz bandwidth, the RC time constant from the 30 pF drain capacitance and Ron limits usable analog bandwidth to roughly 20 MHz, so this part fits low-frequency analog switching (audio, sensor muxing, control voltages) rather than high-speed video or RF. The 16-TSSOP package (4.40 mm width) is a compact surface-mount footprint for dense PCB layouts.
Supply flexibility and channel matching
Single-supply operation spans 3 V to 20 V, or dual supplies from ±2.5 V to ±9 V, allowing the part to work in both single-rail and split-rail systems. The 5 Ohm channel-to-channel matching keeps the Ron variation tight across channels, which matters when the mux is used in a gain-scaling or precision divider network where each channel must present the same source impedance. Max off-leakage current is 100 nA, low enough for most sensor and data-acquisition front ends without introducing noticeable offset error. Channel capacitance is 0.2 pF on the source side and 30 pF on the drain side — the drain capacitance dominates the settling time when switching between channels.