74HC4051 8-Channel Analog Multiplexer / Demultiplexer
Single 8-channel bidirectional analog switch (multiplexer/demultiplexer). Address pins S0/S1/S2 select one of 8 channels (Y0–Y7) to connect to the common I/O (Z). ~E disables all switches. VEE allows bipolar analog signals; tie to GND for 0–5V operation.
Aliase:74HCT4051, CD4051B, Analog MUX, 8:1 MUX
DIP-16 Top View
16 Pins
Pinout Table16
| Pin | Signal / Name | Type | Alternative Functions |
|---|---|---|---|
| 1 | Y4 | Analog | Channel 4 I/O (selected when S2S1S0 = 100) |
| 2 | Y6 | Analog | Channel 6 I/O (selected when S2S1S0 = 110) |
| 3 | Z | Analog | Common I/O (connects to the selected channel Yn) |
| 4 | Y7 | Analog | Channel 7 I/O (selected when S2S1S0 = 111) |
| 5 | Y5 | Analog | Channel 5 I/O (selected when S2S1S0 = 101) |
| 6 | ~E | Digital | Enable (Active Low — pull LOW to activate; HIGH disables all switches) |
| 7 | VEE | Power | Negative Supply for Analog Range (tie to GND for single-supply 0–5V operation) |
| 8 | GND | Ground | System Ground (0V) |
| 9 | S2 | Digital | Channel Select Bit 2 (MSB) |
| 10 | S1 | Digital | Channel Select Bit 1 |
| 11 | S0 | Digital | Channel Select Bit 0 (LSB) |
| 12 | Y3 | Analog | Channel 3 I/O (selected when S2S1S0 = 011) |
| 13 | Y0 | Analog | Channel 0 I/O (selected when S2S1S0 = 000) |
| 14 | Y1 | Analog | Channel 1 I/O (selected when S2S1S0 = 001) |
| 15 | Y2 | Analog | Channel 2 I/O (selected when S2S1S0 = 010) |
| 16 | VCC | Power | Positive Power Supply (2–6V) |