MCP23017-I/SP Microchip Integrated Circuit (Dual-In-Line Packages) In Stock
Microchip MCP23017-I/SP is a 16-bit I2C I/O expander with two 8-bit GPIO ports, 5 MHz clock support, and interrupt output in a 28-pin SPDIP package, enabling microcontrollers to efficiently control up to 16 additional digital I/O lines.
- Manufacturer
- Microchip
- Package
- Dual-In-Line Packages
- Pin Count
- 28
- Lifecycle
- CONTACT MANUFACTURER
- Datasheet
- MCP23017-I/SP Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 16 bidirectional GPIO pins organized as two independent 8-bit ports for flexible I/O expansion via I2C interface
- Up to 5 MHz I2C clock speed with hardware address pins allowing up to 8 devices (128 I/O lines) on a single bus
- Dedicated interrupt output pins (INTA/INTB) for efficient event-driven designs without constant polling overhead
- Wide supply voltage range from 1.8 V to 5.5 V and -40°C to +85°C operating temperature for industrial and consumer applications
Applications
The MCP23017-I/SP is widely deployed in embedded systems where microcontrollers such as Arduino, STM32, or Raspberry Pi need additional GPIO lines for controlling LEDs, buttons, relays, or keypads without consuming all native MCU pins. It is commonly used in industrial automation panels, home automation controllers, and test fixtures requiring a large number of individually addressable digital outputs. The I2C interface with configurable addresses allows designers to chain up to 8 expanders on one bus, providing up to 128 additional I/O lines from just 2 microcontroller pins.
Specifications
| Pbfree Code | Yes |
| Clock Frequency-Max | 5MHz |
| JESD-30 Code | R-PDIP-T28 |
| JESD-609 Code | e3 |
| Number of Bits | 16 |
| Number of I/O Lines | 16 |
| Number of Ports | 2 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP28,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Qualification Status | Not Qualified |
| Screening Level | TS 16949 |
| Supply Voltage-Max | 5.5V |
| Supply Voltage-Min | 1.8V |
| Supply Voltage-Nom | 5V |
| Surface Mount | NO |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| uPs/uCs/Peripheral ICs Type | PARALLEL IO PORT, GENERAL PURPOSE |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Thailand |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for MCP23017-I/SP:
Frequently Asked Questions
How many devices can share one I2C bus with the MCP23017-I/SP, and what is the total I/O count achievable?
The MCP23017-I/SP provides 3 hardware address pins (A0, A1, A2), allowing up to 8 devices to coexist on a single I2C bus. With each device providing 16 GPIO lines, a designer can expand a microcontroller to 128 additional I/O lines using just 2 MCU pins (SDA and SCL), making it ideal for large LED matrix displays, industrial keypad matrices, and multi-relay control boards.
What interrupt features does the MCP23017-I/SP offer for event-driven microcontroller designs?
The MCP23017-I/SP includes dedicated INTA and INTB interrupt output pins, one per 8-bit port. These can be configured to trigger on pin change or compare-against-default-value modes, allowing the host MCU to wake from low-power sleep states only when an input changes. This eliminates continuous polling of 16 I/O lines, reducing CPU load and power consumption in battery-operated devices.
What supply voltage range does the MCP23017-I/SP support, and which operating temperature grade covers industrial use?
The MCP23017-I/SP operates across a supply voltage range of 1.8 V to 5.5 V, covering both 3.3 V and 5 V systems. The I-grade package suffix indicates an industrial temperature range of -40°C to +85°C, making it suitable for factory automation, outdoor control enclosures, and automotive accessory boards requiring operation across a wide thermal environment.
When would an engineer choose MCP23017-I/SP over direct MCU GPIO expansion for a 16-output control board?
Engineers select the MCP23017-I/SP when their target MCU has fewer than 16 available GPIO pins or when those pins are needed for other peripherals. For example, in a Raspberry Pi-based relay board, the Pi's 28 GPIO pins are quickly consumed by SPI displays, UART interfaces, and PWM outputs; adding an MCP23017-I/SP via I2C provides 16 dedicated relay-drive lines using only 2 pins, with each expander costing significantly less than adding a second, larger MCU to the design.
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