MCP23017T-E/SO Microchip Integrated Circuit (Small Outline Packages) In Stock
The MCP23017T-E/SO is a 16-bit I/O expander from Microchip that communicates over an I2C interface at up to 1.7 MHz, adding 16 individually configurable GPIO pins to any microcontroller. It operates from 1.8 V to 5.5 V, supports up to 8 devices on a single bus via 3 address pins, and is housed in a 28-pin SOIC package. Ideal for keyboard scanning, LED matrix control, and embedded systems requiring additional I/O lines.
- Manufacturer
- Microchip
- Package
- Small Outline Packages
- Pin Count
- 28
- Lifecycle
- ACTIVE
- Datasheet
- MCP23017T-E/SO Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $1.1600(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 MCP23017T-E/SO?
- 16 bidirectional GPIO pins split into two 8-bit ports (PORTA and PORTB)
- I2C interface supporting up to 1.7 MHz fast-mode plus with 3-bit address selection for 8 devices on one bus
- Per-pin configurable pull-up resistors (100 kΩ) eliminating external resistors on inputs
- Interrupt output with configurable interrupt-on-change per pin for efficient event-driven designs
- Wide supply voltage: 1.8 V to 5.5 V for compatibility with 3.3 V and 5 V systems
- 28-pin SOIC package with tape-and-reel packaging for automated assembly
What is MCP23017T-E/SO used for?
The MCP23017T-E/SO is widely used in Raspberry Pi and Arduino-based projects to expand the available GPIO count for driving LED matrices, scanning keyboard arrays, and controlling relay banks without consuming microcontroller I/O pins. It also appears in industrial HMI panels, motor controller front-ends, and IoT gateway boards where up to 8 expanders on a single I2C bus can add 128 additional I/O lines.
What are the specifications of MCP23017T-E/SO?
| Pbfree Code | Yes |
| Manufacturer Package Code | SOIC-28 |
| Factory Lead Time | 1Week |
| YTEOL | 8 |
| Clock Frequency-Max | 10MHz |
| JESD-30 Code | R-PDSO-G28 |
| 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 | SOP28,.4 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 250 |
| 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 | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 40 |
| uPs/uCs/Peripheral ICs Type | PARALLEL IO PORT, GENERAL PURPOSE |
| ## MCP23017T-E/SO Alternates Showing results | Image |
| Package | Small Outline Packages |
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 MCP23017T-E/SO datasheet?
MCP23017T-E/SO Datasheet DownloadOfficial datasheet from Microchip
What are equivalent replacements for MCP23017T-E/SO?
Compatible alternatives and drop-in replacements for MCP23017T-E/SO:
Frequently Asked Questions
How many MCP23017T-E/SO devices can share a single I2C bus without additional hardware?
Up to 8 MCP23017T-E/SO devices can share a single I2C bus simultaneously, because the device has 3 hardware address pins (A0, A1, A2) that set the lower 3 bits of the 7-bit I2C address. With all 8 devices present, a single bus can control 128 independent GPIO lines (8 devices × 16 pins), making it very efficient for large I/O expansion in 1.8 V to 5.5 V systems.
Does the MCP23017T-E/SO support interrupt-driven operation to avoid constant polling?
Yes, the MCP23017T-E/SO provides two dedicated interrupt output pins (INTA and INTB), one per 8-bit port. Each pin can be individually configured to trigger an interrupt on change from a default value or on any pin-state change. The interrupt is cleared by reading the GPIO or INTCAP register, allowing a host microcontroller to respond only when an input changes rather than polling all 16 pins continuously, reducing CPU load significantly.
What pull-up resistor options are built into the MCP23017T-E/SO for input pins?
The MCP23017T-E/SO includes individually selectable internal 100 kΩ pull-up resistors on each of the 16 I/O pins when configured as inputs. Enabling these internal pull-ups via the GPPU register eliminates the need for external resistors on button or switch inputs, saving board space and component count. The pull-up voltage tracks VDD, so they work correctly across the full 1.8 V to 5.5 V supply range.
At what I2C clock frequency does the MCP23017T-E/SO operate, and is it compatible with standard 400 kHz fast-mode buses?
The MCP23017T-E/SO supports I2C clock frequencies up to 1.7 MHz (fast-mode plus), which is fully backward compatible with the more common 100 kHz standard mode and 400 kHz fast mode used by most microcontrollers. At 400 kHz a single-byte GPIO register read takes approximately 45 µs, providing response times well within the needs of keyboard scanning or LED refresh applications.
Which package does the MCP23017T-E/SO come in, and how does it compare to the DIP version for production use?
The MCP23017T-E/SO is packaged in a 28-pin SOIC measuring approximately 17.9 mm × 7.5 mm with 1.27 mm pitch leads. Compared to the through-hole PDIP version, the SOIC occupies roughly 40% less PCB area and is supplied on tape-and-reel (the -E/SO suffix) for automated pick-and-place assembly in medium-to-high volume production, making it the preferred choice for compact and manufacturable designs.
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More from Microchip
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $1.6700 | $1.67 |
| 25+ | $1.3473 | $33.68 |
| 100+ | $1.2400 | $124.00 |
| 1000+ | $1.1700 | $1170.00 |
| 5000+ | $1.1600 | $5800.00 |
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