EmbeddedRelated.com
    Parts    MCP23008-E/P
MCP23008-E/P

MCHPMCP23008-E/P

Microchip Technology
I/O Expander 8 I2C 1.7 MHz 18-PDIP
Active7,442 in stock
Datasheet Digi-Key Mouser Compare Prices

Overview

The MCP23008-E/P is an 8-bit I/O expander that uses a high-speed I2C interface to add general-purpose digital pins to a microcontroller. It operates over a wide voltage range of 1.8V to 5.5V and includes a configurable interrupt output to notify the host MCU of input state changes. This variant comes in an 18-pin PDIP package, making it ideal for through-hole prototyping and breadboard use.

Why Choose This Part

It supports high-speed I2C up to 1.7 MHz and provides high-current drive capability of 25mA per I/O for directly driving LEDs. The device features an external reset input and a low standby current of only 1 microamp, making it suitable for power-sensitive applications.

Applications

User Interface Expansion
Driving status LEDs and reading tactile buttons or DIP switches to free up primary MCU pins.
Industrial Control
Interfacing with 5V logic sensors and actuators in systems requiring extended temperature operation up to 125 degrees Celsius.
Mixed-Voltage Systems
Acting as a bridge between low-voltage controllers (1.8V) and higher voltage peripherals (up to 5.5V).

Key Specifications

Features POR
Interface I2C
Output Type Push-Pull
Mounting Type Through Hole
Number of I/O 8
Package / Case 18-DIP (0.300", 7.62mm)
Clock Frequency 1.7 MHz
Interrupt Output Yes
Voltage - Supply 1.8V ~ 5.5V
Operating Temperature -40degC ~ 125degC
Supplier Device Package 18-PDIP
Current - Output Source/Sink 25mA

Getting Started

To use this device, connect the SCL and SDA lines to your MCU's I2C bus with appropriate pull-up resistors. Set the three hardware address pins (A0, A1, A2) to define the unique I2C address, and use standard I2C libraries to write to the IODIR register to configure pins as inputs or outputs.

MCP2300 Family

Comparing specs that differ across variants. The current part is highlighted.

Part Number Package Stock
MCP23008-E/P (this part) DIP-18 7,442
MCP23008T-E/SO SOIC-18 13,576
MCP23008-E/SS SSOP-20 2,619
MCP23008-E/ML VFQFN-20 2,538
MCP23008-E/SO SOIC-18 15,662

Also Consider

MCP23017-E/SP MCHPMicrochip Technology - Offers 16-bit I/O expansion in a 28-pin PDIP package if double the pin count is required.