MCP23008-E/P Microchip Integrated Circuit (Dual-In-Line Packages) In Stock
The MCP23008-E/P is a Microchip 8-bit general-purpose I/O port expander communicating over I2C at up to 1.7 MHz with 8 configurable I/O pins. It comes in an 18-pin DIP package and operates from 1.8 V to 5.5 V. Available from stock with worldwide shipping.
- Manufacturer
- Microchip
- Package
- Dual-In-Line Packages
- Pin Count
- 18
- Lifecycle
- ACTIVE
- Datasheet
- MCP23008-E/P Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $1.1200(MOQ 1)
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of MCP23008-E/P?
- 8 independently configurable general-purpose I/O pins via I2C interface at up to 1.7 MHz
- Wide supply voltage range from 1.8 V to 5.5 V supporting both 3.3 V and 5 V systems
- Interrupt-on-change output to alert host MCU without polling, reducing CPU overhead
- 18-pin DIP package enabling rapid prototyping on breadboards and through-hole designs
- Cascadable up to 8 devices on one I2C bus, expanding GPIO by up to 64 pins
What is MCP23008-E/P used for?
The MCP23008-E/P is commonly used in embedded systems that need additional GPIO beyond what a host microcontroller provides, such as keypad scanning, LED array driving, and relay control via a simple 2-wire I2C bus. Its 1.8 V to 5.5 V operating range makes it compatible with both modern low-voltage MCUs and legacy 5 V logic systems. Industrial control panels, home automation gateways, and Raspberry Pi expansion boards frequently use this device to add 8 interrupt-driven I/O lines without consuming valuable host GPIO resources.
What are the specifications of MCP23008-E/P?
| Pbfree Code | Yes |
| Manufacturer Package Code | PDIP-18 |
| Factory Lead Time | 6Weeks |
| YTEOL | 9 |
| Qualification Status | Not Qualified |
| 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 | 8542.39.00.01 |
| Country of Origin | Thailand |
Where can I find the MCP23008-E/P datasheet?
MCP23008-E/P Datasheet DownloadOfficial datasheet from Microchip
What are equivalent replacements for MCP23008-E/P?
Compatible alternatives and drop-in replacements for MCP23008-E/P:
suggested
suggested
suggested
suggested
Frequently Asked Questions
How many I/O pins does the MCP23008-E/P provide, and what communication interface does it use?
The MCP23008-E/P provides 8 general-purpose I/O pins that are individually configurable as inputs or outputs. It communicates with a host microcontroller over a 2-wire I2C interface supporting clock speeds up to 1.7 MHz, reducing the number of MCU pins required to just 2 lines for full 8-bit GPIO expansion.
Can MCP23008-E/P operate in both 3.3 V and 5 V systems, and what is its supply voltage range?
Yes, the MCP23008-E/P supports a wide supply voltage range of 1.8 V to 5.5 V, making it directly compatible with both 3.3 V ARM/RISC-V microcontrollers and traditional 5 V AVR or PIC systems. No level shifters are needed when both the host MCU and MCP23008-E/P share the same supply rail, saving cost and PCB area.
How many MCP23008-E/P devices can share one I2C bus, and what does this mean for large GPIO expansion needs?
Up to 8 MCP23008-E/P devices can be addressed on a single I2C bus using its 3-bit hardware address pins (A2, A1, A0), expanding the available GPIO to 64 pins total. This makes it highly scalable for industrial control panels, LED matrix drivers, or relay boards that require many individually controlled outputs without increasing the I2C wire count.
Does MCP23008-E/P support interrupt-driven I/O, and how does this reduce MCU processing load?
Yes, the MCP23008-E/P features an interrupt-on-change output (INT pin) that asserts whenever any monitored input changes state. The host MCU responds to this hardware interrupt rather than continuously polling the I2C bus, reducing CPU utilization and allowing lower-power sleep states between events. This is particularly useful in battery-powered IoT devices with 8 sensor inputs monitored at low data rates.
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