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CD4066BE

Quad bilateral analog switch, 125Ω RON, 40MHz, 3-18V, PDIP-14

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Manufacturer Part：

CD4066BE

Package：

PDIP-14 (19.3 x 6.35 x 4.57mm, 2.54mm pitch, through-hole)

Brand：

Product Categories：

Integrated Circuits ICs, Interface ICs

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Description

Product Overview

The CD4066BE from Texas Instruments is a CMOS quad bilateral switch with 125Ω on-state resistance, 10pA off-state leakage, and 40MHz bandwidth, pin-compatible with CD4016B in a 14-pin PDIP package.

Key Specifications

Number of Switches	4 (independent SPST)
Supply Voltage	3V to 18V
On-State Resistance	125Ω typical @ VDD=15V, 470Ω @ VDD=5V
On-Resistance Matching	Within 5Ω @ VDD=15V
Off-State Leakage	10pA typical @ VDD=10V
Signal Range	Full VDD swing (0V to VDD)
Bandwidth (On)	40MHz typical
Crosstalk	-50dB typical @ 8MHz
Distortion	<0.5% typical @ 1kHz, 5Vp-p
Control Input Impedance	10^12 Ω typical
On/Off Ratio	80dB typical @ 10kHz
Operating Temperature	-55°C to +125°C
Package	PDIP-14 (19.3 x 6.35mm)

Features

Four independent bilateral (bidirectional) switches
Pin-compatible with CD4016B (lower RON)
125Ω on-state resistance @ 15V
Ultra-low off-state leakage: 10pA typical
Flat on-resistance over full signal range
High linearity: <0.5% distortion
40MHz bandwidth

Applications

Analog signal switching and multiplexing
Programmable gain amplifier
Digital control of analog signals
Sample-and-hold (CD4016B preferred)
Chopper/modulator circuits

Product Introduction:CD4066BE Product Introduction

The CD4066BE from Texas Instruments is a quad bilateral (bidirectional) analog switch containing four independent single-pole single-throw (SPST) switches in a 14-pin PDIP package. Each switch is controlled by a separate active-HIGH enable input; when the control is HIGH, the switch is ON (conducting), and when LOW, the switch is OFF (high impedance). The 125Ω typical on-state resistance at VDD=15V is significantly lower than the older CD4016B (which has ~400Ω), and the on-resistance remains relatively flat over the full signal input range (0V to VDD) due to the internal biasing of the n-channel well. The bilateral nature means signals can flow in either direction through the switch — there is no designated input or output. The 10pA off-state leakage is extremely low, making the 4066 suitable for high-impedance signal routing. The 40MHz bandwidth supports audio and medium-frequency signal switching. The BE suffix denotes the PDIP-14 package with full temperature range (-55°C to +125°C).

Working Principle:CD4066BE Working Principle

Each switch in the CD4066BE consists of a parallel pair of PMOS and NMOS transistors (transmission gate) controlled by complementary gate signals. When the control input is HIGH (at VDD), the NMOS gate is driven HIGH and the PMOS gate is driven LOW (via internal inverter), turning both transistors ON and creating a low-resistance path between the two signal terminals. When the control is LOW, both transistors are OFF and the signal path is open (high impedance). The parallel NMOS+PMOS structure ensures that the on-resistance remains relatively constant over the full signal range: the NMOS conducts well for signals near VSS, while the PMOS conducts well for signals near VDD. The internal well-biasing circuit connects the n-channel substrate to the input (when ON) or to VSS (when OFF), eliminating threshold voltage modulation that would cause on-resistance variation with signal level. The control input has extremely high impedance (10^12Ω), drawing negligible current from the driving logic. Since the switch is bilateral, either terminal can be the input or output — the signal can pass in either direction. The 10pA off-state leakage means virtually no signal passes when the switch is open, giving 80dB on/off ratio at 10kHz.

Pin Description:CD4066BE Pin Definition and Functions

Pin	Name	Type	Description
1	1IN/OUT	Bidirectional	Switch 1 signal terminal A
2	1OUT/IN	Bidirectional	Switch 1 signal terminal B
3	2OUT/IN	Bidirectional	Switch 2 signal terminal B
4	2IN/OUT	Bidirectional	Switch 2 signal terminal A
5	2CTRL	Input	Switch 2 control (HIGH=ON)
6	3CTRL	Input	Switch 3 control (HIGH=ON)
7	VSS	Power	Ground (0V)
8	3IN/OUT	Bidirectional	Switch 3 signal terminal A
9	3OUT/IN	Bidirectional	Switch 3 signal terminal B
10	4OUT/IN	Bidirectional	Switch 4 signal terminal B
11	4IN/OUT	Bidirectional	Switch 4 signal terminal A
12	4CTRL	Input	Switch 4 control (HIGH=ON)
13	1CTRL	Input	Switch 1 control (HIGH=ON)
14	VDD	Power	Positive supply (3V to 18V)

Application Scenarios:In which products and applications isCD4066BE used

4-Channel Mux: Four inputs to one output (common terminal); MCU controls one switch at a time; selects one of 4 analog signals
PGA (Programmable Gain): Switches select different feedback resistors around an op-amp; digital control sets gain
Audio Switch: Routes audio signals between sources; low distortion (<0.5%) preserves audio quality
Chopper: Switch toggles at high frequency, alternately connecting and disconnecting signal; creates amplitude modulation
Logic-Level Mux: Switches digital signals between circuits; 40MHz bandwidth supports moderate-speed digital

Alternative Models:What chips are recommended as replacements for CD4066BE

Model	Manufacturer	Key Difference	Package	Supply
CD4066BM	TI	SOIC-14 surface-mount version with identical logic function and 3-18V range	SOIC-14	3-18V
CD4066BE	TI	Through-hole DIP version for prototyping and legacy board repair	DIP-14	3-18V
HEF4066BT	NXP	Pin-compatible CMOS version with improved ESD protection and 3-15V supply	SOIC-14	3-15V
MC144066BDR2G	onsemi	Pin-compatible equivalent with RoHS compliance and AEC-Q100 automotive option	SOIC-14	3-18V
74HC4066D	TI/Nexperia	HC CMOS version with higher speed and 2-6V supply for modern logic systems	SOIC-14	2-6V
74HC4066N	TI/Nexperia	HC CMOS through-hole version for prototyping with 2-6V supply range	DIP-14	2-6V
74HCT4066D	Nexperia	HCT version with TTL-compatible inputs for mixed 5V TTL/CMOS systems	SOIC-14	4.5-5.5V

CD4066 is the CMOS 4000-series quad bilateral switch operating over the wide 3-18V supply range. The HEF4066 (NXP) and MC144066 (onsemi) are direct pin-compatible equivalents. For higher speed at the cost of narrower voltage range, the 74HC4066 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).