MCP23018T-E/SO

I/o Expanders Overview

The MCP23018T-E/SO is a Microchip Technology I/O expander featuring a 16-bit bidirectional port with open-drain outputs. It utilizes an I2C interface supporting 100 kHz, 400 kHz, and 3.4 MHz speeds. The device operates on a supply voltage ranging from 1.8 V to 5.5 V and includes configurable interrupt outputs. It passes Automotive AEC-Q100 reliability testing and functions within a temperature range of -40°C to +125°C. The component is housed in a 28-pin SOIC package.

I/o Expanders Feature Summary

• Passes Automotive AEC-Q100 Reliability Testing
• Configurable Interrupt Output Pins
• Single Hardware Address Pin for Multi-Device Bus Support

I/o Expanders Applications

• I2C bus expansion systems
• Automotive electronic modules
• Industrial control interfaces

I/o Expanders Procurement Notes

Verify the datasheet revision DS20002103B against official Microchip documentation. Confirm the 'T' suffix indicates tape-and-reel packaging and the 'SO' suffix denotes the 28-pin SOIC form factor. Ensure the '-E' grade matches the required industrial temperature specifications.

I/o Expanders Selection Notes

Select this model when an I2C interface is required rather than SPI. Verify that the open-drain output configuration meets system sink current requirements. Ensure the single hardware address pin capability aligns with the maximum eight-device limit on the bus.

I/o Expanders Part Context

This part belongs to the MCP23018/MCP23S18 family. The MCP23018 variant specifically provides an I2C interface, whereas the MCP23S18 uses SPI. Both share identical 16-bit I/O functionality and register structures but differ in serial communication protocols.

I/o Expanders Replacement Considerations

MCP23018-E/SO (Tube Packaging)

I/o Expanders FAQ

How does the ADDR pin function?

The ADDR pin acts as a voltage input to determine the client address, allowing up to eight devices on the I2C bus using a single pin.

What are the default states of the I/O pins?

Upon power-up, all I/O pins default to input mode.

Can the interrupt source be configured?

Yes, the interrupt source can be configured to trigger on pin change or when an input state differs from a pre-configured register value.