MCP23009-E/P Microchip Integrated Circuit (Dual-In-Line Packages) In Stock
Microchip MCP23009-E/P is an 8-bit I/O port expander with I2C interface in an 18-pin PDIP package. It provides 8 independently configurable GPIO lines with interrupt-on-change and internal pull-ups operating up to 10 MHz clock. Extends microcontroller I/O capacity with minimal wiring overhead.
- Manufacturer
- Microchip
- Package
- Dual-In-Line Packages
- Pin Count
- 18
- Lifecycle
- ACTIVE
- Datasheet
- MCP23009-E/P Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $1.1500(MOQ 1)
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of MCP23009-E/P?
- 8 individually configurable GPIO pins with selectable internal pull-up resistors
- I2C interface operating up to 10 MHz for fast GPIO expansion over a 2-wire bus
- Interrupt-on-change output to notify host MCU without polling the bus
- Open-drain interrupt output compatible with 3.3 V and 5 V logic systems
- 18-pin PDIP through-hole package facilitating prototyping and easy board assembly
What is MCP23009-E/P used for?
The MCP23009-E/P expands the GPIO capacity of resource-constrained microcontrollers in industrial control panels, home automation controllers, and embedded HMI systems requiring more digital I/O lines than the host MCU provides. Its interrupt-on-change feature allows the host to service up to 8 inputs without repeatedly polling the I2C bus, reducing CPU overhead in event-driven firmware designs. The through-hole PDIP-18 package makes it a popular choice for breadboard prototyping, educational labs, and low-volume production builds.
What are the specifications of MCP23009-E/P?
| Pbfree Code | Yes |
| Manufacturer Package Code | PDIP-18 |
| Factory Lead Time | 6Weeks |
| YTEOL | 9 |
| Clock Frequency-Max | 10MHz |
| JESD-30 Code | R-XDIP-T18 |
| JESD-609 Code | e3 |
| Number of Bits | 8 |
| Number of I/O Lines | 8 |
| Number of Ports | 8 |
| Package Body Material | UNSPECIFIED |
| Package Equivalence Code | DIP18,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Qualification Status | Not Qualified |
| Supply Current-Max | 1mA |
| Supply Voltage-Max | 5.5V |
| Supply Voltage-Min | 1.8V |
| Supply Voltage-Nom | 5V |
| Surface Mount | NO |
| Technology | CMOS |
| Temperature Grade | AUTOMOTIVE |
| 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) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Thailand |
Where can I find the MCP23009-E/P datasheet?
MCP23009-E/P Datasheet DownloadOfficial datasheet from Microchip
What are equivalent replacements for MCP23009-E/P?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How many GPIO pins does the MCP23009-E/P add, and can they be mixed as inputs and outputs?
The MCP23009-E/P provides 8 GPIO pins that can each be independently configured as an input or output by setting the corresponding bit in the IODIR register. Internal 100 kΩ pull-up resistors on each input pin reduce external component count, and any mix of input and output directions is supported simultaneously.
At what I2C clock speed does the MCP23009-E/P operate, and how many devices can share one bus?
The MCP23009-E/P supports I2C clock frequencies up to 10 MHz (High-Speed mode) and has 3 address configuration pins, allowing up to 8 MCP23009 devices on a single 2-wire I2C bus. This means a host MCU can control up to 64 additional GPIO lines with just 2 signal wires.
For a prototyping setup, why is the PDIP-18 package of the MCP23009-E/P beneficial compared to surface-mount alternatives?
The 18-pin PDIP through-hole package fits directly into breadboards and standard 0.1-inch pitch DIP sockets without soldering, enabling rapid hardware iteration. Lab setups and educational projects can swap the device in seconds, while the 2.54 mm pin pitch allows hand-soldering on perfboard for low-volume prototypes.
How does the interrupt-on-change feature of the MCP23009-E/P reduce bus traffic in event-driven designs?
When any enabled GPIO input changes state, the MCP23009-E/P asserts its open-drain INT pin, signaling the host MCU to read only the capture register rather than polling all 8 inputs on every cycle. This interrupt-driven approach can reduce I2C bus transactions by an order of magnitude in low-activity systems, freeing MCU bandwidth for other tasks.
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