74HC4051

The CJMCU-4051 is a breakout board for the 74HC4051 8-Channel Analog Multiplexer/Demultiplexer IC. It allows a single microcontroller analog or digital pin to interface with up to 8 channels, selected via 3 digital address pins (S0, S1, S2). Ideal for expanding the ADC inputs of Arduino, ESP32, and other microcontrollers. Supports both analog and digital signal routing in either direction.

Features:

• IC: 74HC4051 (SP8T — Single Pole, 8 Throw)
• Channels: 8 analog/digital (bidirectional)
• Address select pins: S0, S1, S2 (3-bit binary selection)
• Analog input voltage range: ±5V
• ON resistance: 80Ω @ 4.5V | 70Ω @ 6V | 60Ω @ 9V
• Logic level translation: 5V digital ↔ ±5V analog signals
• Enable pin (E): disables all switches when HIGH
• Board size: 30 × 19mm
• Compatible with Arduino, ESP32, Raspberry Pi