Microchip Technology MCP23S17-E/SS 16-Bit I/O Expander
Best I/O expander for space-constrained electronics projects.
Expand your system's I/O capabilities with the Microchip Technology MCP23S17-E/SS, a 16-bit I/O expander designed for efficient integration via the SPI serial interface. This component offers precise control over each I/O pin, allowing you to configure them as inputs or outputs with polarity inversion options. It operates at speeds up to 10MHz and supports a 5.5V operating voltage, making it a versatile solution for a wide range of electronic projects. Housed in a compact 28-pin SSOP package, it's an ideal choice for adding digital interfacing where space is a consideration.
$86.56
Owner Satisfaction
4.7
/ 5
Category Rank
44
/ 1004
#44 in Integrated Circuits & Chips
Price vs Category Average
+0%
Below average
Interface
SPI
/ SPI
Who it's for
- Engineers needing extra pins for complex sensor arrays
- Developers requiring high-speed data throughput for responsive systems
- Programmers looking to optimize code by eliminating constant polling
Who should skip it
- Designers working with microcontrollers that have limited available pins
- Hobbyists lacking the equipment for fine-pitch surface mount soldering
- Engineers requiring ultra-fast bit-banging performance for time-critical tasks
Performance breakdown
Interface Speed
The 10MHz SPI throughput handles high-speed data transfers with ease.
I/O Density
Sixteen bits of expansion in a compact footprint maximizes board efficiency.
Configuration Flexibility
Individual pin control and polarity inversion offer exceptional design versatility.
Voltage Compatibility
Reliable 5.5V operation integrates seamlessly into most standard logic systems.
Form Factor
The SSOP package is perfect for space-constrained modern circuit designs.
Integration Ease
Standard SPI protocol ensures straightforward implementation for most microcontroller projects.
Key Specs
Interface
SPI
Pins
28-Pin
Operating Voltage
5.5 V
Maximum Speed
10MHz
Package Type
SSOP 28-Pin
Model Number
MCP23S17-E/SS
Resolution
16 bits
Function Type
Logic Gate
Features
- 16-bit parallel I/O expansion
- Configurable input/output pins
- High-speed SPI interface
- Input polarity inversion control
- Dedicated configuration registers
- Compact SSOP 28-pin package
- Ideal for general purpose I/O
- Supports 5.5V operation
What customers say
The MCP23S17 I/O Expander is highly regarded as a reliable workhorse for embedded projects using the SPI bus. Users consistently praise its seamless integration and the availability of excellent software libraries, which greatly simplify implementation and speed up development. This component reliably delivers 16 additional general purpose I/O pins without adding complexity or noticeable latency. Satisfaction is high among engineers and hobbyists alike, recognizing the MCP23S17 as an essential, dependable component that performs exactly as expected, offering great utility in its standard package.
Know before you buy
This chip is designed to expand the number of digital input/output pins on your microcontroller. It provides 16 additional I/O lines, which is particularly useful when your main processor has run out of available pins.
The MCP23S17-E/SS uses the SPI serial interface. It supports high-speed communication up to 10MHz, making it a fast and reliable choice for data-intensive projects.
Yes, each of the 16 pins can be independently configured as either an input or an output. You can also utilize the built-in polarity inversion feature to flip the logic state of input pins as needed.
The device operates at a maximum voltage of 5.5V. It is designed to be compatible with standard logic levels, ensuring easy integration into most 5V-based electronic systems.
The 28-pin SSOP package is quite compact, which is great for space-constrained designs. However, because it is a surface-mount component with a fine pitch, you will likely need a breakout board or a PCB if you are prototyping on a standard breadboard.
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