MCP23S18-E/SO

I/o Expanders Overview

The MCP23S18-E/SO is a 16-bit I/O expander utilizing an SPI interface, housed in a 28-pin SOIC package. It operates within a voltage range of 1.8V to 5.5V and supports clock frequencies up to 10 MHz at 2.7V or higher. The device features open-drain outputs capable of 25 mA sink current per pin and 400 mA total. It includes configurable interrupt pins (INTA/INTB), hardware reset functionality, and passes AEC-Q100 reliability testing. Operating temperatures span from -40°C to +125°C.

I/o Expanders Feature Summary

• Supports high-speed SPI communication with 10 MHz capability
• Provides 16-bit bidirectional I/O expansion with open-drain outputs
• Features configurable interrupt-on-change and interrupt-on-default mechanisms
• Includes external hardware reset input for system control

I/o Expanders Applications

• Embedded systems requiring parallel I/O expansion via serial bus
• Automotive electronics applications meeting AEC-Q100 standards
• Industrial control interfaces needing wide operating temperature ranges

I/o Expanders Procurement Notes

Verify the specific suffix 'E' indicates the extended industrial temperature grade (-40°C to +125°C) as documented in the datasheet. Confirm the 'SO' designation corresponds to the 28-lead Small Outline Integrated Circuit package. Ensure compatibility with the host controller's SPI protocol settings before procurement.

I/o Expanders Selection Notes

Select this component when an SPI interface is preferred over I2C to avoid address pin configuration complexity. The MCP23S18 variant is suitable for designs requiring up to 10 MHz data rates. Consider the 28-pin SOIC package constraints regarding PCB space and thermal dissipation requirements for the application environment.

I/o Expanders Part Context

This part belongs to the MCP23X18 family of 16-bit I/O expanders. While functionally identical to the MCP23018, it utilizes an SPI interface instead of I2C. This eliminates the need for hardware address pins, simplifying board layout when multiple devices are used on separate chip select lines.

I/o Expanders Replacement Considerations

The MCP23018-E/SO serves as a functional equivalent if the system can support I2C communication. Both share identical register maps and electrical characteristics except for the serial interface type. Verify that the replacement interface matches the host controller's available protocols.