I/O Expander, 16 Bit, 1.7Mhz, Dip-28; No. Of Bits:16Bit; Interfaces:I2C, Serial; Supply Voltage Min:4.5V; Supply Voltage Max:5.5V; Ic Case/Package:Dip; No. Of Pins:28Pins; No. Of I/O S:16I/O S; Operating Temperature Min:-40°C Rohs Compliant: Yes |Microchip MCP23017-E/SP

MCP23017-E/SP – 16-Bit I²C I/O Expander IC – Microchip Technology

Expand your microcontroller capabilities with the MCP23017-E/SP from Microchip Technology. This versatile 16-bit I/O expander solves pin limitation challenges in embedded designs, enabling efficient peripheral control through a simple I²C interface. Ideal for space-constrained applications, it features interrupt-driven operation and wide voltage compatibility for seamless system integration.

Key Features

• 16 configurable I/O ports with individual direction control
• I²C serial interface (up to 1.7 MHz clock frequency)
• Wide voltage range: 1.8V to 5.5V operation
• High drive capability: 25mA source/sink per I/O
• Robust design: -40°C to +125°C operating temperature
• Interrupt output for efficient event monitoring
• Power-On Reset (POR) for reliable initialization

Technical Specifications

• Interface: I²C (supports 100kHz/400kHz/1.7MHz modes)
• Output Type: Push-Pull with programmable pull-ups
• Package: 28-pin SPDIP (through-hole mounting)
• Dimensions: 0.300″ (7.62mm) width
• Compliance: Industrial-grade temperature range

Download the full datasheet for detailed electrical characteristics and register maps.

Typical Applications

• Industrial control panel interfaces
• Home automation systems (sensor arrays, relay banks)
• LED matrix and display drivers
• Keyboard/button expansion modules
• Prototyping boards for Arduino/Raspberry Pi

About Microchip Technology

Microchip Technology stands as a global leader in microcontroller, mixed-signal, and analog semiconductors. With over three decades of innovation, they deliver rigorously tested components renowned for consistent performance in mission-critical applications. Their commitment to quality management systems ensures component-to-component reliability across industrial and automotive environments.

The company maintains extensive in-house manufacturing capabilities paired with vertically integrated testing, guaranteeing supply chain stability. Microchip’s solutions undergo qualification testing beyond industry standards, providing design engineers with confidence in extreme operating conditions.

About I/O Expander ICs

I/O expanders address one of embedded design’s most common constraints: limited microcontroller GPIO pins. These integrated circuits function as “port multipliers,” translating serial protocols like I²C or SPI into additional parallel I/O channels. This enables sophisticated peripheral networks without requiring costly MCU upgrades or complex multiplexing circuits.

Critical for modern electronics, I/O expanders simplify PCB layouts, reduce BOM costs, and provide design scalability. They’re fundamental in applications requiring distributed sensors, multi-segment displays, or high-density control interfaces where direct microcontroller connectivity is impractical.

Packaging

This I/O expander IC is supplied in protective tube packaging, ensuring secure transit and convenient handling for manual assembly or prototyping.

Frequently Asked Questions

Q: How many devices can I chain on one I²C bus?
A: The MCP23017 supports up to 8 devices on a single bus (3 hardware address pins).

Q: Is this IC 5V-tolerant when operating at 3.3V?
A: Yes, all pins withstand 5.5V maximum regardless of operating voltage.

Q: Can I use this with 3.3V microcontrollers like ESP32?
A: Absolutely. The 1.8V-5.5V range ensures compatibility with both 3.3V and 5V systems.

Q: Does it support interrupt-driven input monitoring?
A: Yes, the interrupt output pin signals input state changes, reducing MCU polling overhead.

Q: Are there development resources available?
A> Microchip provides comprehensive code libraries and examples for major platforms.

Q: What’s the typical power consumption?
A> Standby current is 1µA (max), with active current under 1mA at 1MHz operation.

⚠️ Note: Product images are representational; refer to datasheet for exact dimensions.

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