MCP23S18T-E/MJVAO

I/o Expanders Overview

The MCP23S18T-E/MJVAO is a 16-bit I/O expander with open-drain outputs, manufactured by Microchip Technology. It utilizes an SPI serial interface and is housed in a 24-pin QFN package (4x4 mm). The device operates within a supply voltage range of 1.8 V to 5.5 V and supports clock frequencies up to 10 MHz when VDD is between 2.7 V and 5.5 V. It features two interrupt pins (INTA and INTB) and passes AEC-Q100 automotive reliability testing. Operating temperatures range from -40°C to +125°C.

I/o Expanders Feature Summary

• Provides 16-bit remote bidirectional I/O expansion via SPI interface
• Features configurable interrupt output pins supporting active-high, active-low, or open-drain modes
• Includes polarity inversion register for input port data configuration
• Supports hardware reset input and low standby current consumption

I/o Expanders Applications

• Automotive electronic systems requiring reliable I/O expansion
• Industrial control applications needing extended digital inputs and outputs
• Embedded systems utilizing SPI communication protocols

I/o Expanders Procurement Notes

Verify the specific ordering suffix MJVAO against official Microchip documentation to confirm the QFN-24 package and tape-and-reel packaging format. Ensure the component meets the required AEC-Q100 qualification standards for your specific application environment. Cross-reference the datasheet revision DS20002103B for accurate pinout and electrical specifications before finalizing procurement.

I/o Expanders Selection Notes

Select this component when an SPI interface is preferred over I2C for higher speed communication up to 10 MHz. It is suitable for designs requiring 16 general-purpose I/O pins with open-drain capabilities. Consider the 24-pin QFN package constraints for PCB layout and thermal management. Verify that the system voltage falls within the 1.8 V to 5.5 V operating range.

I/o Expanders Part Context

This part belongs to the MCP23X18 family, which includes both I2C (MCP23018) and SPI (MCP23S18) variants. The MCP23S18 specifically replaces the I2C bus lines with SPI signals (CS, SCK, SI, SO), eliminating the need for hardware address pins found on the I2C version. It shares identical GPIO functionality, register maps, and interrupt handling mechanisms with its I2C counterpart.

I/o Expanders Replacement Considerations

The MCP23S18T-E/SO is a direct replacement offering the same SPI interface and functionality in a 28-pin SOIC package. For I2C interface requirements, the MCP23018 series serves as the functional equivalent but requires different bus wiring.