MCP23018T-E/MJ

I/o Expanders Overview

The MCP23018T-E/MJ is a Microchip Technology I/O expander featuring a 16-bit bidirectional port with open-drain outputs. It utilizes an I2C interface supporting 100 kHz, 400 kHz, and 3.4 MHz speeds. The device operates on a supply voltage ranging from 1.8 V to 5.5 V. Each pin provides 25 mA sink capability, with a total of 400 mA available across the port. It includes configurable interrupt outputs and a hardware address pin for multi-device bus configurations. The component passes Automotive AEC-Q100 reliability testing and functions within a temperature range of -40°C to +125°C.

I/o Expanders Feature Summary

• Passes Automotive AEC-Q100 Reliability Testing
• Configurable Interrupt Output Pins
• Single Hardware Address Pin for Bus Expansion
• External Reset Input

I/o Expanders Applications

• Automotive electronic systems requiring reliable I/O expansion
• Embedded controllers needing additional bidirectional ports via I2C
• Industrial applications operating in extended temperature environments

I/o Expanders Procurement Notes

Verify the specific package designation associated with the MJ suffix against official Microchip documentation to confirm physical dimensions and pinout compatibility. Ensure that the ordering suffix corresponds exactly to the required tape-and-reel configuration for automated assembly processes.

I/o Expanders Selection Notes

Select this model when an I2C interface is preferred over SPI for system connectivity. Consider the single hardware address pin limitation if more than eight devices are required on the same bus segment. Verify that the open-drain output characteristics align with the load requirements of the connected peripherals.

I/o Expanders Part Context

This component belongs to the MCP23X18 family of 16-bit I/O expanders. It shares functional similarities with the MCP23S18, which differs primarily by utilizing an SPI interface instead of I2C. Both variants offer identical GPIO capabilities and register structures, allowing for flexible interface selection based on host controller availability.

I/o Expanders Replacement Considerations

MCP23018T-E/SS

I/o Expanders FAQ

How many devices can be addressed on a single I2C bus using the hardware address pin?

Up to eight devices can be placed on the bus by applying different voltage levels to the ADDR pin.

What is the maximum sink current per I/O pin?

Each I/O pin is capable of sinking up to 25 mA.

Does the device support interrupt-on-change functionality?

Yes, the interrupt source can be configured to trigger when an input state differs from its corresponding input port register state or a pre-configured default value.