MCP23017-E/SP Microchip Integrated Circuit (Dual-In-Line Packages) In Stock
MCP23017-E/SP is a 16-bit I/O port expander communicating over I2C at up to 10 MHz, packaged in a 28-pin SPDIP through-hole format. It provides two independently configurable 8-bit ports with interrupt outputs and configurable pull-up resistors. Designed to expand GPIO resources of microcontrollers in HMI panels, relay drivers, LED matrices, and industrial control systems.
- Manufacturer
- Microchip
- Package
- Dual-In-Line Packages
- Pin Count
- 28
- Lifecycle
- ACTIVE
- Datasheet
- MCP23017-E/SP Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $1.2631(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 MCP23017-E/SP?
- 16-bit bidirectional I/O expansion over I2C interface
- I2C clock speed up to 10 MHz
- Two independent 8-bit ports with interrupt outputs
- Configurable internal pull-up resistors per pin
- 3-bit hardware address selection for up to 8 devices on one bus
- 28-pin SPDIP through-hole package
What is MCP23017-E/SP used for?
The MCP23017-E/SP is commonly used in Raspberry Pi and Arduino projects to add 16 extra GPIO lines over I2C when onboard pins are insufficient for driving relay banks, keypads, or LED arrays. Industrial HMI panels use it to interface front-panel buttons and indicator LEDs to a microcontroller without consuming additional SPI or UART channels. Its 8-device addressability allows up to 128 additional I/O lines on a single I2C bus in automation controllers.
What are the specifications of MCP23017-E/SP?
| Pbfree Code | Yes |
| Manufacturer Package Code | SPDIP-28 |
| Factory Lead Time | 6Weeks |
| YTEOL | 8 |
| CPU Family | MCP23X17 |
| Clock Frequency-Max | 10MHz |
| 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 |
| Supply Current-Max | 1mA |
| Supply Voltage-Max | 5.5V |
| Supply Voltage-Min | 4.5V |
| 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 | 8542.39.00.01 |
| Country of Origin | Thailand |
Where can I find the MCP23017-E/SP datasheet?
MCP23017-E/SP Datasheet DownloadOfficial datasheet from Microchip
What are equivalent replacements for MCP23017-E/SP?
Compatible alternatives and drop-in replacements for MCP23017-E/SP:
Frequently Asked Questions
How many I/O pins does the MCP23017-E/SP add to a microcontroller via I2C?
The MCP23017-E/SP provides 16 bidirectional I/O pins organized as two independent 8-bit ports, each configurable individually as input or output, effectively doubling available GPIO on a microcontroller with a single I2C connection.
Can multiple MCP23017-E/SP devices share the same I2C bus without address conflicts?
Yes, three hardware address pins (A0, A1, A2) allow up to 8 MCP23017-E/SP devices on one I2C bus, giving a maximum of 128 additional I/O lines from a single 2-wire bus running at up to 10 MHz.
How do the interrupt outputs on the MCP23017-E/SP reduce polling overhead in an embedded design?
Each port has a dedicated INTA or INTB interrupt output that asserts when any enabled input changes state; the host microcontroller only needs to query the device upon interrupt, eliminating the overhead of constantly polling 16 pins at the I2C bus speed.
For a relay-driver board using the MCP23017-E/SP, how much current can each output source or sink?
Each output pin can source or sink up to 25 mA, and the total package dissipation limits the aggregate current; for driving relay coils above 25 mA, an external driver transistor or ULN2003 array is recommended per output.
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