MCP23018T-E/MJ Microchip Integrated Circuit (Quad Flat No-Lead) In Stock
Microchip MCP23018T-E/MJ is a 16-bit I2C GPIO expander in a compact QFN-24 package. Provides 2 ports of 8 configurable I/O lines each, supporting up to 10 MHz clock. Available from stock with worldwide shipping.
- Manufacturer
- Microchip
- Package
- Quad Flat No-Lead
- Pin Count
- 24
- Lifecycle
- ACTIVE
- Datasheet
- MCP23018T-E/MJ Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $1.4700(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 MCP23018T-E/MJ?
- 16-bit I2C GPIO expansion with 2 independent 8-bit ports configurable as inputs or outputs
- Up to 10 MHz I2C clock frequency for high-speed communication with host microcontrollers
- Open-drain output architecture supporting multiple voltage levels across mixed-supply systems
- Compact QFN-24 package enabling high port density in space-constrained designs
What is MCP23018T-E/MJ used for?
The MCP23018T-E/MJ is designed for applications requiring additional GPIO capacity beyond a microcontroller's native pins, such as keyboard matrix scanning, LED array driving, and relay or relay-driver control in industrial automation panels. Its 16 I/O lines with interrupt-on-change capability make it well-suited for human-machine interfaces, touchpad controllers, and smart building systems where numerous buttons and indicators must be monitored. The open-drain output structure also fits multi-master I2C buses used in server management and embedded computing boards.
What are the specifications of MCP23018T-E/MJ?
| Manufacturer Package Code | QFN-24 |
| Factory Lead Time | 6Weeks |
| YTEOL | 9 |
| Clock Frequency-Max | 10MHz |
| JESD-30 Code | S-PQCC-N24 |
| 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 | LCC24,.16SQ,20 |
| Package Shape | SQUARE |
| Package Style | CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Current-Max | 1mA |
| Supply Voltage-Max | 5.5V |
| Supply Voltage-Min | 1.8V |
| Supply Voltage-Nom | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | AUTOMOTIVE |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.5mm |
| Terminal Position | QUAD |
| uPs/uCs/Peripheral ICs Type | PARALLEL IO PORT, GENERAL PURPOSE |
| Package | Quad Flat No-Lead |
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 |
Where can I find the MCP23018T-E/MJ datasheet?
MCP23018T-E/MJ Datasheet DownloadOfficial datasheet from Microchip
What are equivalent replacements for MCP23018T-E/MJ?
Compatible alternatives and drop-in replacements for MCP23018T-E/MJ:
suggested
suggested
suggested
Frequently Asked Questions
How many individually configurable GPIO lines does the MCP23018T-E/MJ provide, and how are they organised?
The MCP23018T-E/MJ delivers 16 GPIO lines divided into 2 independent 8-bit ports, GPIOA and GPIOB. Each pin can be individually configured as an input or output via the IODIR register, and each input pin can optionally enable a 100 kΩ internal pull-up resistor, making the device very flexible for keyboard scanning, LED driving, and signal monitoring tasks.
What is the maximum I2C clock speed the MCP23018T-E/MJ supports, and does it work with standard Fast-Mode controllers?
The MCP23018T-E/MJ supports I2C clock frequencies up to 10 MHz using its high-speed mode, which is significantly faster than the standard 400 kHz Fast Mode. Standard Fast-Mode and 100 kHz Standard-Mode controllers are also fully compatible, so the device integrates seamlessly with virtually all modern 1.8 V to 5.5 V microcontrollers without special logic-level adapters.
In a keyboard matrix or button-panel design, how does the MCP23018T-E/MJ's interrupt-on-change feature reduce host CPU load?
The MCP23018T-E/MJ features interrupt-on-change outputs (INTA and INTB) that assert a signal whenever any monitored input pin changes state. The host processor can sleep or run other tasks and only wake on the interrupt, avoiding continuous polling of all 16 I/O lines over the I2C bus. This reduces bus traffic by orders of magnitude in applications with infrequent events such as button presses or 8-channel sensor alarms.
How many MCP23018T-E/MJ devices can share the same I2C bus, and what sets their addresses?
Up to 8 MCP23018T-E/MJ devices can share a single I2C bus simultaneously, yielding 128 additional GPIO pins from one bus. Each device's 3-bit hardware address is set by connecting the A0, A1, and A2 pins to VDD or VSS, producing addresses in the range 0x20 to 0x27. This is particularly valuable in large LED display panels, industrial relay boards, and server backplane management controllers.
When should a designer choose MCP23018T-E/MJ over MCP23008 for a new product?
Choose the MCP23018T-E/MJ when the design requires 16 GPIO lines in a single device, as the MCP23008 provides only 8 I/O lines in a similar package. The dual-port device halves the component count and reduces I2C bus traffic compared to using two MCP23008 chips, which lowers BOM cost and simplifies PCB routing on designs such as 4×4 keypad scanners, 16-output relay drivers, or mixed input/output control panels.
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