3V to 18V bilateral switch — four independent SPST channels in one SOIC
The Texas Instruments CD4066BM96 is a 4000B-series bilateral FET switch containing four independent SPST (1:1) analog switch circuits in a single 14-SOIC package. Each switch conducts equally well in both directions, with the control logic referenced to the supply rails. The 3V to 18V supply range covers standard 5V logic, 12V industrial rails, and 15V analog supplies, making this a straightforward drop-in for mixed-voltage signal routing — audio, analog multiplexing, sample-and-hold, or relay-replacement tasks where the 4000B family's wider voltage tolerance is preferred over the 74HC or 74HCT equivalents.
For a 4000B-series part that has been in production for decades, this is a stable BOM line — no urgent bridge-buy needed, and the part remains orderable through standard independent distribution channels.
Dual-supply operation — what it means for analog signal range
The CD4066BM96 is specified for dual-supply operation, meaning the switch can pass signals that swing above and below the common reference — useful for bipolar analog signals. With a 3V to 18V total rail span, the on-resistance and signal-handling symmetry are maintained across the full voltage range. For single-supply designs, simply tie the negative rail to ground; the switch still works, but the analog signal must stay within the supply rails. The 4000B series does not include the built-in overvoltage protection found on newer analog switches, so input voltage should not exceed VDD or go below VSS.