onsemi MC14066BCP: Datasheet, Pinout, and Application Circuit Guide

The MC14066BCP from onsemi is a highly reliable quad bilateral switch IC belonging to the renowned 4000-series CMOS logic family. This device is engineered to function as a high-performance electronic switch for analog or digital signals, making it a fundamental component in a vast array of electronic circuits, from audio routing and modulation to signal multiplexing and programmable gain control.

This guide provides a detailed overview of its datasheet specifications, pinout configuration, and a practical application circuit.

Datasheet Overview and Key Specifications

The MC14066BCP integrates four independent analog switches on a single monolithic chip. Each switch is capable of bidirectional signal flow, meaning input and output terminals are interchangeable, offering significant design flexibility.

Key absolute maximum ratings and electrical characteristics from the datasheet include:

Supply Voltage Range (VDD): The recommended operating voltage is from 3V to 18V DC, a wide range that allows for compatibility with both TTL and higher voltage systems.

Switch On Resistance (RON): Typically 105Ω at a 15V supply and 55Ω at a 10V supply with minimal variation between channels. This is a critical parameter for analog signal integrity.

Low Power Consumption: Features extremely low quiescent power consumption, typically in the nanowatt range, making it ideal for battery-powered devices.

High Noise Immunity: Inherits the standard CMOS technology benefits of high noise immunity over the entire supply voltage range.

Operating Temperature Range: -55°C to +125°C, suitable for industrial and automotive applications.

The device is offered in a 14-lead PDIP package, denoted by the "P" suffix in MC14066BCP, which is ideal for prototyping and through-hole PCB designs.

Pinout Configuration

Understanding the pinout is crucial for proper circuit design. The MC14066BCP in a 14-pin DIP package has the following pin configuration:

Pins 1, 3, 8, 10: Control Inputs (CONTROL A, B, C, D). A high logic level (`VDD`) closes the corresponding switch; a low level (`VSS`) opens it.

Pins 2, 4, 9, 11: Input/Output X (X1, X2, X3, X4). One side terminal for each of the four switches.

Pins 5, 6, 12, 13: Input/Output Y (Y1, Y2, Y3, Y4). The other side terminal for each switch.

Pin 7: VSS or Ground (GND). The negative supply voltage terminal.

Pin 14: VDD. The positive supply voltage terminal.

Application Circuit Guide: Audio Source Selector

A classic application for the MC14066BCP is a simple 4-channel audio source selector. This circuit allows a user to choose one of four different audio inputs (e.g., Microphone, MP3 Player, Radio Tuner) to route to a single output, such as an amplifier.

Circuit Operation:

1. Components: You will need one MC14066BCP IC, four audio input jacks, one output jack, four single-pole single-throw (SPST) switches or a microcontroller for control, a power supply (e.g., 9V), and bypass capacitors.

2. Wiring:

Connect Pin 7 (VSS) to ground and Pin 14 (VDD) to the positive supply rail (+9V).

The four audio input signals are connected to the X pins (e.g., Input 1 to Pin 2, Input 2 to Pin 4, etc.).

All corresponding Y pins (Pins 5, 6, 12, 13) are tied together and connected to the common output signal line, which goes to the output jack.

The control pins (1, 3, 8, 10) are connected to physical switches that are pulled down to ground with resistors. When a switch is engaged, it connects the control pin to VDD, activating that specific channel.

3. Functionality: Only one control switch should be high at any given time. When a control pin is high, the corresponding analog switch closes, connecting its audio input to the common output. The other three switches remain open, preventing their signals from passing through. This provides a clean and simple method for analog signal multiplexing.

ICGOODFIND: The onsemi MC14066BCP remains a versatile and robust solution for analog signal switching tasks. Its wide voltage range, low power consumption, and simple digital control interface make it an excellent choice for designers working on audio systems, data acquisition, analog-to-digital conversion systems, and any design requiring precise control over analog signal paths. Its through-hole package ensures ease of use for both hobbyists and engineers during the prototyping phase.

Keywords: Analog Switch, CMOS Logic, Multiplexer, Bidirectional, On Resistance