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MCP23017

MCHPMCP23017

MPN: MCP23017T-E/SO
Microchip Technology
I/O Expander 16 I2C 1.7 MHz 28-SOIC
NRND38,944 in stock
Datasheet Digi-Key Mouser Compare Prices

Overview

The MCP23017 is a 16-bit I/O expander that provides remote bidirectional I/O for microcontroller-based systems via an I2C interface. It features two 8-bit ports with configurable interrupt outputs and a wide operating voltage range of 1.8V to 5.5V. This device is AEC-Q100 qualified, making it suitable for automotive and high-reliability industrial environments.

Why Choose This Part

The device supports a high-speed I2C clock frequency of up to 1.7 MHz and includes a polarity inversion register for flexible logic management. Its low standby current of 1uA and integrated power-on reset (POR) simplify power management in battery-operated or critical systems.

Applications

User Interface Expansion
Scanning matrices of keypads, buttons, and switches while managing status LEDs with 25mA source/sink capability per pin.
LCD and Peripheral Control
Driving parallel interfaces for character LCDs or controlling multiple chip-select lines for SPI peripherals when host GPIO is limited.
Industrial Sensor Monitoring
Aggregating digital status signals from industrial equipment using the configurable interrupt-on-change feature to reduce MCU polling overhead.

Key Specifications

Features POR
Interface I2C
Output Type Push-Pull
Mounting Type Surface Mount
Number of I/O 16
Package / Case 28-SOIC (0.295", 7.50mm Width)
Clock Frequency 1.7 MHz
Interrupt Output Yes
Voltage - Supply 1.8V ~ 5.5V
Operating Temperature -40degC ~ 125degC
Supplier Device Package 28-SOIC
Current - Output Source/Sink 25mA

Getting Started

To begin development, connect the SCL and SDA pins to an I2C host and use the three hardware address pins (A0, A1, A2) to set a unique bus address. Many engineers use the Microchip PICkit Serial Analyzer or common libraries available for the Arduino and Raspberry Pi ecosystems to rapidly prototype register configurations.

Part of PCF8574 / MCP23017 I/O Expanders family » MCP23017T

MCP23017T Family

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

Part Number Package Stock
MCP23017T-E/SO (this part) SOIC-28 38,944
MCP23017T-E/ML VQFN-28 32,477
MCP23017T-E/SS SSOP-28 32,890

Also Consider

PCA9555 NXP Semiconductors - An industry-standard 16-bit I2C expander often used as an alternative when 1.7 MHz operation is not required.

Categories

Interface ICs > I/O Expanders