MCP23018T-E/SS

I/o Expanders Overview

The MCP23018T-E/SS is a 16-bit I/O expander with an I2C interface, manufactured by Microchip Technology. It operates within a supply voltage range of 1.8 V to 5.5 V and supports clock frequencies up to 3.4 MHz. The device features open-drain outputs capable of 25 mA sink current per pin and 400 mA total. It includes configurable interrupt outputs (INTA, INTB), an external reset input, and a hardware address pin allowing up to eight devices on the bus. Operating temperatures range from -40°C to +125°C. It is housed in a 24-pin SSOP package.

I/o Expanders Feature Summary

• Passes Automotive AEC-Q100 Reliability Testing
• Configurable Interrupt Output Pins: Active-high, Active-low or Open-drain
• Single Hardware Address Pin for Multi-device Bus Support
• Low Standby Current: 1 µA (-40°C to +85°C)

I/o Expanders Applications

• Embedded systems requiring parallel I/O expansion via I2C
• Automotive electronics applications
• Industrial control interfaces

I/o Expanders Procurement Notes

Verify the ordering suffix 'T' indicates tape-and-reel packaging and '-E' denotes industrial temperature grade. Confirm the 'SS' suffix corresponds to the 24-pin SSOP package. Ensure compatibility with the host system's I2C voltage levels and signal integrity requirements before procurement.

I/o Expanders Selection Notes

Select this component when an I2C interface is required for 16-bit I/O expansion. Compare against MCP23S18 if SPI connectivity is preferred. Verify that the 24-pin SSOP package fits the PCB layout constraints. Check if the automotive qualification is necessary for the specific application environment.

I/o Expanders Part Context

This part belongs to the MCP23X18 family, which provides 16-bit general-purpose parallel I/O expansion. The MCP23018 variant specifically utilizes an I2C interface, distinguishing it from the MCP23S18 which uses SPI. Both share identical GPIO functionality and register maps.

I/o Expanders Replacement Considerations

MCP23018T-E/SO (SOIC-28 package)

I/o Expanders FAQ

How many devices can be connected on the I2C bus using the MCP23018?

Up to eight devices can be connected on the bus using the single hardware address pin (ADDR).

What is the default state of the I/O pins upon power-on reset?

The I/O pins default to input mode after a Power-on Reset (POR).

Can the interrupt output polarity be configured?

Yes, the interrupt output pins (INTA and INTB) can be configured as active-high, active-low, or open-drain.