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CD4051BE

8-ch analog mux/demux, 125Ω Ron, VEE-VDD signal, PDIP-16

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Manufacturer Part：

CD4051BE

Package：

PDIP-16 (19.3 x 6.35 x 4.57mm, 2.54mm pitch, through-hole)

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Description

Product Overview

The CD4051BE is a single 8-channel analog multiplexer/demultiplexer from Texas Instruments with digital control, wide analog signal range (VDD to VEE), and low ON resistance in a 16-pin PDIP package.

Key Specifications

Channels 8:1 multiplexer / 1:8 demultiplexer
Logic Family CD4000B CMOS
Supply Voltage (VDD) 3V to 18V
Analog Signal Range VEE to VDD (bipolar with split supply)
ON Resistance (RON) 125Ω typical @ VDD=15V, 470Ω @ VDD=5V
RON Variation (ΔRON) 10Ω typical @ VDD=15V
OFF Leakage Current ±0.08nA typical @ 25°C
Bandwidth 20MHz typical (signal frequency)
Control Inputs 3 address (A, B, C) + 1 inhibit (INH)
Inhibit (INH) Active-high (disables all channels)
Crosstalk -50dB typical @ 1MHz
Operating Temperature -55°C to +125°C
Package PDIP-16 (19.3 x 6.35mm)

Features

  • 8-channel analog multiplexer/demultiplexer
  • Wide analog signal range: VEE to VDD
  • Bipolar analog signal handling with split supply
  • Low ON resistance: 125Ω typical at 15V
  • Digital address selection (3 bits for 8 channels)
  • Inhibit pin disables all channels
  • Break-before-make switching
  • Low OFF leakage current: 0.08nA typical

Applications

  • Analog signal multiplexing to ADC
  • Sensor channel selection
  • Audio signal routing
  • Digital signal switching
  • Programmable gain amplifier input selection

The CD4051BE from Texas Instruments is a single 8-channel analog multiplexer and demultiplexer that connects one of eight channel I/O pins (Y0-Y7) to a common I/O pin (Z) based on a 3-bit digital address (A, B, C). The device can handle analog signals ranging from VEE to VDD; with VDD=5V and VEE=-5V, it switches bipolar signals from -5V to +5V. The ON resistance is 125Ω typical at VDD=15V and 470Ω at VDD=5V. The inhibit (INH) input, when HIGH, disconnects all channels from the common pin. The break-before-make switching ensures that no two channels are ever momentarily shorted together during address transitions. The E suffix denotes the PDIP-16 plastic through-hole package.

The CD4051BE uses CMOS transmission gates (parallel NMOS + PMOS pairs) as analog switches. Each transmission gate can pass signals from VEE to VDD because the NMOS passes signals near VEE and the PMOS passes signals near VDD; together they cover the full range. The 3-bit address (A, B, C) is decoded by an internal 3-to-8 decoder that enables one of the eight transmission gates, connecting the selected channel (Y0-Y7) to the common pin (Z). When the address changes, the decoder briefly disables the old channel before enabling the new one (break-before-make), preventing momentary shorts. The INH pin overrides the address decoder; when INH=HIGH, all transmission gates are off, and the Z pin is in a high-impedance state. The ON resistance varies with the analog signal voltage: RON is lowest when the signal is near mid-supply and increases near VDD or VEE rails. At VDD=5V, RON ranges from approximately 200Ω to 1500Ω depending on signal level and temperature. For accurate analog measurement, the source impedance plus RON must be much lower than the ADC input impedance.

Pin Name Type Description
1 Y4 I/O Channel 4 analog I/O
2 Y6 I/O Channel 6 analog I/O
3 Z I/O Common analog I/O (connected to selected channel)
4 Y7 I/O Channel 7 analog I/O
5 Y5 I/O Channel 5 analog I/O
6 INH Input Inhibit (active HIGH, disables all channels)
7 VEE Power Negative analog supply (or GND for single supply)
8 VSS Power Ground (digital)
9 A Input Address bit A (LSB)
10 B Input Address bit B
11 C Input Address bit C (MSB)
12 Y3 I/O Channel 3 analog I/O
13 Y0 I/O Channel 0 analog I/O
14 Y1 I/O Channel 1 analog I/O
15 Y2 I/O Channel 2 analog I/O
16 VDD Power Positive supply (3V to 18V)
  • ADC Input Mux: 8 sensors multiplexed to single ADC; MCU selects channel via A,B,C; INH disables during ADC conversion
  • Bipolar Signals: VDD=+5V, VEE=-5V; switches ±5V analog signals for audio or instrumentation
  • Audio Routing: 20MHz bandwidth passes audio; 50dB crosstalk isolation between channels
  • Demultiplexing: Signal applied to Z routes to one of Y0-Y7 under address control; distributes clock or reference
  • Gain Select: Y0-Y7 connect different gain-setting resistors in op-amp feedback; address selects gain
Model Manufacturer Key Difference Package Supply
CD4051BM TI SOIC-16 surface-mount version with identical logic function and 3-18V range SOIC-16 3-18V
CD4051BE TI Through-hole DIP version for prototyping and legacy board repair DIP-16 3-18V
HEF4051BT NXP Pin-compatible CMOS version with improved ESD protection and 3-15V supply SOIC-16 3-15V
MC144051BDR2G onsemi Pin-compatible equivalent with RoHS compliance and AEC-Q100 automotive option SOIC-16 3-18V
74HC4051D TI/Nexperia HC CMOS version with higher speed and 2-6V supply for modern logic systems SOIC-16 2-6V
74HC4051N TI/Nexperia HC CMOS through-hole version for prototyping with 2-6V supply range DIP-16 2-6V
74HCT4051D Nexperia HCT version with TTL-compatible inputs for mixed 5V TTL/CMOS systems SOIC-16 4.5-5.5V

CD4051 is the CMOS 4000-series 8-channel analog multiplexer/demultiplexer operating over the wide 3-18V supply range. The HEF4051 (NXP) and MC144051 (onsemi) are direct pin-compatible equivalents. For higher speed at the cost of narrower voltage range, the 74HC4051 HC/HCT families offer significantly faster propagation delay and lower power consumption at 2-6V. Surface-mount versions use the BM/M suffix (SOIC); through-hole versions use the BE suffix (DIP).

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