MCP23S18T-E/MJ

I/o Expanders Overview

The MCP23S18T-E/MJ is a 16-bit I/O expander with open-drain outputs, utilizing an SPI interface. It operates within a voltage range of 1.8V to 5.5V and supports clock frequencies up to 10 MHz at 2.7V ≤ VDD ≤ 5.5V. The device features 16 bidirectional I/O pins defaulting to input, with 25 mA sink capability per pin and 400 mA total. It includes configurable interrupt outputs (INTA/INTB), polarity inversion registers, and an external reset input. Packaged in a 24-pin QFN (4x4 mm) format, it passes AEC-Q100 reliability testing and functions across temperatures from -40°C to +125°C.

I/o Expanders Feature Summary

• Provides 16-bit remote bidirectional I/O expansion via high-speed SPI interface
• Features open-drain outputs tolerant to 5.5V with configurable interrupt-on-change or default value comparison
• Includes hardware address decoding for I2C variants and single hardware address pin support

I/o Expanders Applications

• Automotive electronic systems requiring AEC-Q100 qualified components
• Industrial control panels needing extended GPIO capabilities
• Embedded systems integrating multiple peripheral devices via serial interfaces

I/o Expanders Procurement Notes

Verify the specific suffix MJ corresponds to the 24-pin QFN package configuration as documented in official Microchip datasheets. Confirm that the operating environment meets the specified temperature range and voltage requirements before finalizing procurement orders.

I/o Expanders Selection Notes

Select this model when an SPI interface is required instead of I2C. Ensure the host system can handle the 10 MHz maximum clock frequency. Consider the 24-pin QFN package constraints for PCB layout and thermal management during the design phase.

I/o Expanders Part Context

This component belongs to the MCP23X18 family, which includes both I2C (MCP23018) and SPI (MCP23S18) variants. The primary distinction lies in the serial communication protocol used for register access and data transfer between the host microcontroller and the expander.

I/o Expanders Replacement Considerations

Direct functional substitutes include other MCP23S18 variants with different packaging options such as SOIC-28 or SSOP-24, provided the pinout compatibility and interface requirements are met.