MCP23017T in PCF8574 / MCP23017 I/O Expanders Family
The MCP23017T family by Microchip Technology consists of 16-bit, general-purpose parallel I/O expansion chips designed for applications requiring additional I/O ports via the I2C serial bus. Operating over a wide voltage range of 1.8V to 5.5V, these expanders provide high-speed serial communication up to 1.7 MHz. They are widely utilized by embedded engineers to reduce microcontroller pin count while maintaining fast response times for user interfaces, sensor arrays, and industrial control logic.
Variants in This Sub-Family
Comparing specs that differ across variants.
| Part Number | Package | Stock |
|---|---|---|
| MCP23017T-E/ML (Microchip Technology) | VQFN-28 | 32,477 |
| MCP23017T-E/SO (Microchip Technology) | SOIC-28 | 38,944 |
| MCP23017T-E/SS (Microchip Technology) | SSOP-28 | 32,890 |
The 'T' suffix denotes tape and reel packaging for automated assembly. Physical variants differ primarily in package dimensions and thermal performance: the E/SO variant uses a 28-lead SOIC for easier prototyping and standard PCB density, the E/SS offers a compact SSOP footprint, and the E/ML provides a space-saving 6x6mm QFN package suited for high-vibration or extremely space-constrained designs.
