MCP23S09T-E/SO

I/o Expanders Overview

The MCP23S09T-E/SO is an 8-bit I/O expander with SPI interface in SOIC-18 package. Operating voltage ranges from 1.8V to 5.5V. Maximum clock frequency is 10MHz. It features open-drain outputs capable of 25mA sink per pin and 200mA total. Interrupt output is configurable as active-high, active-low, or open-drain. Internal pull-up resistors are individually configurable. ESD protection is not specified for this variant.

I/o Expanders Feature Summary

• SPI serial interface supporting Mode 0,0 and Mode 1,1
• Configurable interrupt-on-change with capture register
• Open-drain outputs with 5.5V tolerant inputs
• Individual internal pull-up resistor configuration

I/o Expanders Applications

• General purpose parallel I/O expansion for SPI applications
• Systems requiring hardware reset capability
• Multi-device bus configurations using address decoding

I/o Expanders Procurement Notes

Verify the 'T' suffix indicates tape-and-reel packaging. Confirm the 'E' suffix denotes industrial temperature range (-40°C to +125°C). Ensure the SOIC-18 package matches PCB footprint requirements. Check RoHS compliance status if required by specific manufacturing standards.

I/o Expanders Selection Notes

Select this component when SPI interface is preferred over I2C. Use for designs requiring open-drain outputs and configurable interrupts. Suitable for systems needing hardware reset functionality. Consider power consumption specifications for low-power applications.

I/o Expanders Part Context

Part of the MCP23X09 family offering 8-bit I/O expansion. Differs from MCP23009 only in serial interface type (SPI vs I2C). Shares identical register map and electrical characteristics. Available in multiple packages including QFN, PDIP, SSOP, and SOIC.

I/o Expanders Replacement Considerations

MCP23S09-E/SSOP offers same functionality in SSOP-20 package. MCP23S09-E/P provides through-hole option in PDIP-18. MCP23S09-E/ML available in QFN-20 package. All variants share identical electrical specifications and register compatibility.