onsemi MC14066BD Quad Bilateral Switch: Datasheet, Application Circuit, and Pinout Guide

The onsemi MC14066BD is a highly versatile and widely used integrated circuit belonging to the 4000-series CMOS logic family. It contains four independent bilateral switches capable of transmitting both analog and digital signals. This makes it an essential component for a vast array of applications, including signal routing, modulation, and analog-to-digital conversion.

Pinout Guide

The MC14066BD is housed in a standard 14-pin DIP (Dual In-line Package). The pin configuration is as follows:

Pins 1, 3, 8, 10: Input/Output terminals for the four switches.

Pins 2, 4, 6, 12: Output/Input terminals for the four switches.

Pins 5, 13, 1, 9: Control Pins for the switches (active high).

Pin 7: Ground (VSS).

Pin 14: Supply Voltage (VDD).

Each switch is controlled by a single digital input. A high logic level on the control pin closes the switch, creating a low-resistance path between its two terminals. A low logic level opens the switch, resulting in a high-impedance (off) state.

Key Datasheet Specifications

Understanding the absolute maximum ratings and electrical characteristics is crucial for reliable circuit design:

Supply Voltage Range (VDD): -0.5V to +18V

Analog Signal Range: VSS (GND) to VDD

On-State Resistance (RON): Typically 280Ω at VDD = 10V and 25°C. This value varies with supply voltage and signal level.

Low Power Consumption: Characteristic of CMOS technology.

High Noise Immunity: Also inherent to CMOS logic families.

Application Circuit Example: A Simple Analog Multiplexer

One of the most common uses for the MC14066BD is constructing a basic 4-channel analog multiplexer. This circuit allows a single analog-to-digital converter (ADC) input to select from one of four different analog sensor signals.

How it works:

1. Four analog input signals (e.g., from sensors) are connected to the input pins of the four switches (e.g., pins 1, 3, 8, 10).

2. The output pins of all four switches (pins 2, 4, 6, 12) are tied together and connected to a single ADC input on a microcontroller.

3. The control pins (pins 5, 13, 1, 9) are connected to digital output pins on the microcontroller.

4. To read a specific sensor, the microcontroller sets its corresponding control pin HIGH while keeping all other control pins LOW. This connects only the desired analog signal to the ADC.

This setup efficiently expands the analog input capabilities of a system using a simple and cost-effective IC.

ICGOODFIND Summary

The onsemi MC14066BD is a fundamental and robust CMOS component for signal switching and routing. Its ability to handle analog signals within the full supply voltage range, combined with its simple digital control, makes it an indispensable tool for designers. From audio signal gating and programmable gain amplifiers to multiplexing and chopper circuits, the MC14066BD offers a reliable and straightforward solution for a multitude of electronic design challenges.

Keywords: Analog Switch, Signal Multiplexing, CMOS Logic, On-State Resistance, Bilateral Switch