MCP23017T-E/ML Microchip Integrated Circuit (Quad Flat No-Lead) In Stock
MCP23017T-E/ML is a 16-bit I2C I/O expander providing two 8-bit GPIO ports with interrupt outputs, configurable pull-ups, and up to 10 MHz clock in a 28-pin QFN package. Expands MCU I/O over a 2-wire I2C bus with up to 8 devices per bus for 128 additional I/O lines. Available from stock with worldwide shipping.
- Manufacturer
- Microchip
- Package
- Quad Flat No-Lead
- Pin Count
- 28
- Lifecycle
- ACTIVE
- Datasheet
- MCP23017T-E/ML Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 16 bidirectional GPIO lines organized as two independent 8-bit ports, each configurable as input or output per pin via simple I2C register writes
- Hardware address pins allow up to 8 MCP23017 devices on a single I2C bus, yielding up to 128 additional I/O lines per bus
- Dedicated interrupt-on-change outputs for each port enable interrupt-driven MCU wake-up without polling overhead
- Operates from 1.8 V to 5.5 V supply covering 3.3 V and 5 V system rails, with 400 mA per port sink/source current for LED driving
- 28-pin VQFN (QFN-28) package at 6 x 6 mm offering compact footprint for densely populated control boards
Applications
MCP23017T-E/ML is widely used for expanding GPIO on microcontrollers with limited pins, such as adding keyboard matrix scanning, relay output boards, or LED indicator arrays to a Raspberry Pi or Arduino without hardware changes to the host MCU. Its 2-wire I2C interface with selectable 7-bit address enables stacking up to 8 expanders on one bus, making it practical for PLC-style I/O modules needing 64 to 128 digital I/O channels from a single board. Industrial HMI panels, vending machine controllers, and building automation systems commonly use MCP23017 to manage button inputs and status indicator outputs through a compact 28-pin QFN footprint.
Specifications
| Pbfree Code | Yes |
| Manufacturer Package Code | VQFN-28 |
| Factory Lead Time | 3Weeks |
| YTEOL | 8 |
| Clock Frequency-Max | 10MHz |
| JESD-30 Code | S-PQCC-N28 |
| 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 | LCC28,.24SQ,25 |
| 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 | 4.5V |
| Supply Voltage-Nom | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | AUTOMOTIVE |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.65mm |
| Terminal Position | QUAD |
| Time@Peak Reflow Temperature-Max (s) | 40 |
| uPs/uCs/Peripheral ICs Type | PARALLEL IO PORT, GENERAL PURPOSE |
| ## MCP23017T-E/ML Alternates Showing results | Image |
| Package | Quad Flat No-Lead |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
| Country of Origin | Philippines, Thailand |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for MCP23017T-E/ML:
Frequently Asked Questions
How many I/O lines does MCP23017T-E/ML add, and how are they organized?
MCP23017T-E/ML provides 16 bidirectional I/O lines organized as two 8-bit ports (PORTA and PORTB), each pin independently configurable as input or output via I2C register writes at up to 10 MHz bus speed, effectively doubling or tripling available GPIOs on an MCU with only 8 to 12 physical pins spare.
How many MCP23017T-E/ML devices can share one I2C bus, and how many total I/O lines does that yield?
Up to 8 MCP23017T-E/ML devices can share a single I2C bus by setting 3 hardware address pins (A0–A2) to unique binary combinations from 0b000 to 0b111, providing 8 x 16 = 128 additional I/O lines per bus, sufficient for a full 128-input keyboard scanner or 128-output LED matrix driver.
Does MCP23017T-E/ML support interrupt-driven I/O to avoid continuous polling?
Yes, MCP23017T-E/ML provides two dedicated interrupt output pins (INTA for PORTA, INTB for PORTB) that assert on any configured pin change, allowing the host MCU to sleep and wake only on I/O events rather than polling I2C registers every millisecond, reducing CPU load by over 90% in button-matrix scanning applications.
What supply voltage range does MCP23017T-E/ML support, and can it interface 3.3 V MCUs with 5 V peripherals?
MCP23017T-E/ML operates from 1.8 V to 5.5 V, but it must share the same logic level as the I2C bus; for true 3.3 V to 5 V level translation you need an external bidirectional level shifter, while the device on its own is ideal for single-voltage 3.3 V or 5 V systems driving relays, LEDs, or opto-isolators rated at the same rail.
For a panel controller needing 48 button inputs, how does using three MCP23017T-E/ML devices compare to a dedicated keyboard controller?
Three MCP23017T-E/ML devices on one I2C bus provide 48 interrupt-capable input lines at a combined BOM cost under $3, with no firmware stack needed beyond simple 2-wire register reads, compared to a dedicated keyboard controller IC that typically adds a proprietary serial protocol, higher unit cost, and a longer lead time of 10+ weeks.
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