CD74HC4067 CMOS 16-Channel Analog-Digital Multiplexer Module

CD74HC4067 CMOS 16-Channel Analog-Digital Multiplexer Module is a highly versatile break-out board designed to expand the input and output capabilities of microcontrollers with limited pins. This module utilizes a high-speed CMOS silicon-gate integrated circuit that functions as a digitally controlled analog switch, allowing you to connect 16 individual signals to a single common pin. Consequently, it serves as an ideal solution for projects requiring extensive sensor arrays or complex signal routing. Because the internal switches are bidirectional, the module effectively handles both analog and digital signals in either direction. Furthermore, the CD74HC4067 offers very low “on” resistance and minimal signal leakage to maintain high signal integrity. Therefore, you can efficiently scale your Arduino, ESP32, or STM32 projects without upgrading to a more expensive, high-pin-count controller.

Key Features:

• 16-Channel Expansion: It allows a single analog or digital pin to interface with up to 16 different sources by using only 4 digital selection pins.
• Bidirectional Operation: The module supports signal flow in both directions, enabling its use as either a multiplexer or a demultiplexer.
• Wide Signal Range: It handles both digital logic levels and analog signals ranging from 0 V to the supply voltage (V_CC).
• Low Power Consumption: This CMOS-based IC draws very little current, which makes it suitable for battery-powered or energy-efficient embedded devices.
• Enable Pin Control: The board includes an “Enable” pin (EN) that can disconnect all channels simultaneously, providing a “high-impedance” state for the common bus.

Technical Specifications:

• Operating Voltage (V_CC): 2.0 V to 6.0 V
• Typical “On” Resistance (R_ON): ≈ 70 Ω (at 4.5 V)
• Switching Speed: ≈ 6 ns (at 4.5 V)
• Propagation Delay: ≈ 5 ns
• Logic Level Compatibility: TTL and CMOS
• Operating Temperature: −55°C to +125°C
• Input Leakage Current: ±0.1 μA (Typical)

Mechanical Specifications:

• PCB Construction: Double-sided high-quality FR4 board.
• Mounting Pins: Standard 2.54 mm (0.1 in) pitch for easy breadboard or PCB integration.
• Connector Surface: Gold-plated or high-quality tinned pads for reliable conductivity.
• Durability: Highly resistant to environmental stress in standard industrial and hobbyist conditions.

Dimensions:

• Module Length: ≈ 40.5 mm
• Module Width: ≈ 17.8 mm
• Board Thickness: ≈ 1.6 mm
• Weight: ≈ 3.0 g

Pinout and Wiring:

• SIG (Common Pin): The main signal pin that connects to the selected channel (C0-C15).
• C0 – C15: The 16 individual input/output channels for your sensors or signals.
• S0, S1, S2, S3: Binary selection pins used to choose the active channel.
• EN (Enable): Active low pin; connect to GND for operation, or drive HIGH to disable all switches.
• VCC: Connect to your system supply voltage (typically 3.3 V or 5 V).
• GND: Connect to the common system ground.
• Wiring Note: However, ensure that the input signal voltage never exceeds the V_CC supplied to the module to prevent damage.

Datasheet Reference:

• Download CD74HC4067 Multiplexer Datasheet

Commonly Used in:

• Arduino Sensor Hubs: Extending the number of analog sensors a single Arduino Uno can read.
• LED Matrices: Routing signals for large-scale display boards and lighting arrays.
• Data Acquisition Systems: Managing multiple telemetry inputs in industrial monitoring.

Applications:

• Analog Signal Routing: Switching between multiple audio or low-frequency signals in test equipment.
• Digital Logic Multiplexing: Selecting between various digital communication lines.
• Keypad Scanning: Reducing the pin count required to scan large-scale button matrices.
• Voltage Monitoring: Tracking battery cell voltages in multi-cell packs through a single ADC pin.

Equivalent Models:

• 74HC4051: An 8-channel version of the same CMOS family for smaller scale multiplexing.
• HEF4067B: A functionally identical 16-channel analog multiplexer from NXP.
• MAX306: A high-performance, precision 16-channel multiplexer with slightly different electrical characteristics.

Package Includes:

• 1 x CD74HC4067 CMOS 16-Channel Analog-Digital Multiplexer Module
• 1 x Set of Male Header Pins (Unsoldered)