Onsemi MC14051BCP: 8-Channel Analog Multiplexer/Demultiplexer Datasheet and Application Overview
The MC14051BCP from Onsemi is a monolithic CMOS analog integrated circuit designed as an 8-channel analog multiplexer/demultiplexer. This device, part of the renowned 4000 series logic family, is built with complementary MOS technology, which provides it with the essential benefits of very low power consumption and a wide operating voltage range. It is housed in a 16-pin DIP (Dual In-line Package), making it suitable for a broad spectrum of prototyping and industrial applications.
The core function of the MC14051BCP is to control analog signals digitally. It functions as a single-pole, 8-throw switch, meaning it can connect a single common input/output pin (the Z pin) to any one of eight independent channels (Y0 to Y7) based on the state of three binary control inputs (A, B, and C) and an active-low inhibit input. This allows a microcontroller or digital logic circuit to selectively route analog signals from multiple sources to a single destination, such as an analog-to-digital converter (ADC), or vice-versa.
A critical feature highlighted in its datasheet is its ability to handle analog signals within the full voltage range of its power supply. With a typical operating voltage range from 3V to 18V, the device is versatile for both 5V and higher voltage systems. Key electrical characteristics include low "on" resistance (typically 270Ω with a 15V supply) and very high "off" resistance, ensuring minimal signal attenuation and excellent channel isolation. The device also boasts a very low quiescent current, making it ideal for battery-powered and portable equipment.
Application Overview
The versatility of the MC14051BCP makes it a cornerstone component in numerous electronic systems. Its primary applications include:
Data Acquisition Systems: Multiplexing multiple analog sensor inputs (e.g., temperature, pressure, light) into a single ADC for processing by a microcontroller.
Programmable Gain Amplifiers: Switching between different feedback resistors in an op-amp circuit to digitally control amplification gain.
Audio and Video Signal Routing: Selecting between different audio or standard-definition video sources.
Communication Systems: Used for channel selection and signal routing.
Analog-to-Digital and Digital-to-Analog Conversion Systems: Expanding the number of analog channels a converter can handle.
When implementing this IC, designers must consider factors such as on-resistance (RON) and its flatness across the signal range, which can introduce distortion in precision applications. Furthermore, the digital control lines should be properly decoupled from the analog paths to prevent noise injection.
ICGOODFIND Summary
The Onsemi MC14051BCP remains a highly reliable and fundamental component for analog signal switching. Its robust design, wide voltage range, and extremely low power consumption solidify its position as a go-to solution for multiplexing and demultiplexing tasks in both modern and legacy designs across industrial, automotive, and consumer electronics.
Keywords:
Analog Multiplexer
CMOS
Signal Routing
Low Power Consumption
Data Acquisition
