CD4051B 8-Channel Analog Multiplexer: Specs and Selection Guide
2026-10-17 · PartVane Electronics
The CD4051BE is a single 8-channel analog multiplexer/demultiplexer from the Texas Instruments CD405xB family (CD4051B, CD4052B and CD4053B share one datasheet). This guide summarizes what the TI datasheet states, so you can decide quickly whether it suits your signal chain, for example in front of an ADC such as the ADS1115.
Key datasheet facts
| Item | TI datasheet statement |
|---|---|
| Function | Single 8-channel analog multiplexer or demultiplexer; bidirectional signal path |
| Single supply | 3 V to 20 V (performance degrades for VDD below 3 V) |
| Dual supply | ±3 V to ±10 V |
| Digital control range | 3 V to 20 V |
| Analog signal | Up to 20 V peak-to-peak |
| ON resistance | 125 Ω typical over input range at VDD = 15 V |
| Channel leakage | ±10 pA typical (see datasheet for conditions) |
| ESD | HBM 3000 V, CDM 2000 V |
| Packages (CD405xB) | PDIP-16 (N) 19.3 mm x 9.4 mm; SOIC-16 (D) 9.9 mm x 3.9 mm |
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When it fits
- Sharing one ADC input among up to eight sensors or switches.
- Mixed-voltage designs where the analog signal swing exceeds the logic supply, using the VEE pin for a negative rail.
- Low-speed signal routing where 125 Ω ON resistance is acceptable.
Design cautions
- ON resistance varies with supply voltage; check the datasheet curves for your VDD before sizing source impedance.
- Keep the analog signal within the supply rails (VEE to VDD).
- Choose DIP or SOIC according to the board process; confirm the exact orderable suffix in the datasheet addendum.
Sourcing the CD4051BE
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Sources
Parts in This Article
- CD4051BE datasheet, pinout & specs – Texas Instruments
- ADS1115IDGSR datasheet, pinout & specs – Texas Instruments