MCP23S17T-E/SS

I/o Expanders Overview

The MCP23S17T-E/SS is a 16-bit I/O expander with an SPI interface, manufactured by Microchip Technology. It operates within a supply voltage range of 1.8V to 5.5V and supports clock frequencies up to 10 MHz. The device features two interrupt outputs (INTA and INTB) and three hardware address pins for bus configuration. It is housed in a 28-lead SSOP package and functions across an extended temperature range from -40°C to +125°C.

I/o Expanders Feature Summary

• Configurable interrupt output pins support active-high, active-low, or open-drain modes.
• Hardware address pins allow up to eight devices on the same serial bus.
• Polarity inversion register enables logical inversion of input port data.

I/o Expanders Applications

• SPI-based embedded systems requiring GPIO expansion
• Industrial control interfaces operating in extended temperature environments
• Key matrix scanning applications

I/o Expanders Procurement Notes

Verify that the component matches the specific 'E' grade designation for extended temperature operation (-40°C to +125°C). Confirm the 'SS' suffix corresponds to the SSOP-28 package type required for the design. Ensure the datasheet version aligns with the manufacturing date code to validate electrical characteristics.

I/o Expanders Selection Notes

Select this model when an SPI interface is preferred over I2C to avoid address conflicts or when higher clock speeds are necessary. The 'E' variant is required for applications exceeding standard commercial temperature limits. Verify that the host controller supports the required SPI mode and provides sufficient current drive for the selected load conditions.

I/o Expanders Part Context

This part belongs to the MCP23X17 family, which includes both I2C (MCP23017) and SPI (MCP23S17) variants. The T suffix indicates tape and reel packaging, while E denotes the extended industrial temperature grade. The SSOP-28 package offers a compact footprint suitable for space-constrained PCB layouts.

I/o Expanders Replacement Considerations

The MCP23S17T-E/SO serves as a pin-compatible alternative using the SOIC-28 package. For I2C connectivity requirements, the MCP23017T-E/SS provides equivalent functionality with a different serial protocol.