74HC4067 16-Channel Analog Multiplexer

16-channel bidirectional analog/digital multiplexer; a 4-bit address on S0–S3 selects one of 16 I/O channels to connect to the common SIG pin. Active-LOW enable (EN) disables all channels when HIGH. Operates at 2V–6V, compatible with 3.3V logic.

VCC
Supply voltage; 3.3V–5V range; use 3.3V for direct ESP32 logic compatibility
Type · powerVoltage · 3.3
GND
Common ground — must be shared with ESP32 ground rail
Type · ground
S0
Address bit 0 — shared with second MUX; driven by one ESP32 GPIO
Type · digital
S1
Address bit 1 — shared with second MUX; driven by one ESP32 GPIO
Type · digital
S2
Address bit 2 — shared with second MUX; driven by one ESP32 GPIO
Type · digital
S3
Address bit 3 — shared with second MUX; driven by one ESP32 GPIO
Type · digital
EN
Active-LOW enable/inhibit pin — each MUX chip requires its own EN GPIO for independent chip-select; drive LOW to enable, HIGH to disable
Type · digital
SIG
Common signal/output pin (also labelled Z or COM); connect to one ESP32 ADC or digital input GPIO per MUX chip; reads the currently selected channel
Type · analog

Pin	Type	Function	Voltage
VCC	power	Supply voltage; 3.3V–5V range; use 3.3V for direct ESP32 logic compatibility	3.3
GND	ground	Common ground — must be shared with ESP32 ground rail
S0	digital	Address bit 0 — shared with second MUX; driven by one ESP32 GPIO
S1	digital	Address bit 1 — shared with second MUX; driven by one ESP32 GPIO
S2	digital	Address bit 2 — shared with second MUX; driven by one ESP32 GPIO
S3	digital	Address bit 3 — shared with second MUX; driven by one ESP32 GPIO
EN	digital	Active-LOW enable/inhibit pin — each MUX chip requires its own EN GPIO for independent chip-select; drive LOW to enable, HIGH to disable
SIG	analog	Common signal/output pin (also labelled Z or COM); connect to one ESP32 ADC or digital input GPIO per MUX chip; reads the currently selected channel

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