8-to-1 Mapping: Easily expand the analog input pins of a microcontroller (like Arduino or ESP32) to read 8 sensors using just 3 digital pins, Bi-directional Switching: Works for both analog signals (0V to $V_{DD}$) and digital signals, Low "ON" Resistance: Minimizes signal distortion and voltage drops during transmission, Wide Supply Range: Operates on a wide voltage range from 3V to 20V, making it compatible with various logic levels. Read more
the CD4051BM SOP-16 (SMD) is a high-speed CMOS Analog Multiplexer/Demultiplexer designed for complex signal routing. At Electrapac, we recommend this SMD version for professional-grade PCB designs where space-saving and high-density component placement are critical.
The CD4051BM is essentially a digitally controlled analog switch. It features 8-channels that can be used as either an 8-to-1 Multiplexer (selecting one of eight inputs to send to a single output) or a 1-to-8 Demultiplexer. Because it is an analog switch, it can handle both digital logic levels and analog signals (like audio or sensor voltages) within its supply range.
Space-Saving SMD Format: The SOP-16 footprint is ideal for modern, compact surface-mount PCB projects, reducing the overall size of your device.
Bi-Directional Switching: Signals can flow in both directions (input to output or vice-versa), making it incredibly versatile for both sensor data collection and signal distribution.
Low "OFF" Leakage: Ensures minimal signal interference between channels, which is vital for high-precision analog measurements.
Logic Level Translation: The digital control signals can have a different logic level than the analog signals being switched, allowing you to control high-voltage analog signals with a low-voltage 3.3V microcontroller.
Wide Voltage Swing: Supports a wide range of analog signals, from small millivolt sensor data to large audio waveforms.
Analog Input Expansion: Use just 1 Analog pin on your Arduino/ESP32 to read up to 8 different sensors (LDRs, Potentiometers, Thermistors).
Audio Routing: Switch between different audio sources in a DIY mixer or preamp.
Digital Signal Multiplexing: Directing communication lines (like UART or SPI) to different peripherals.
Programmable Gain Amplifiers: Using the switch to select different resistor values in an Op-Amp circuit.
Automated Testing: Selecting different test points on a circuit board to be measured by a single DMM or Oscilloscope.
We source the CD4051BM in original SOP-16 packaging to ensure consistent thermal performance and lead-frame integrity during the soldering process. At
| Specifications | Descriptions |
|---|---|
| Model | CD4051BM / CD4051BM96 |
| Package Type | SOP-16 (SMD) |
| Channels | 8-Channel |
| Supply Voltage ($V_{DD}$) | 3V to 20V |
| Logic Type | CMOS Analog Multiplexer |
| Operating Temp | -55°C to +125°C |
| Switching Speed | ~720ns (at 5V) |
| Package | 1 x 1 CD4051BM SMD IC |
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