| MCP23016 | Not Recommended for new designs | | $1.15 | 16-bit I/O Port Expander | 2.0 - 5.5 | I²C™ | 400 | 28/QFN, 28/SOIC 300mil, 28/SPDIP, 28/SSOP 208mil |
| MCP23017 | In Production | | $0.87 | 16-bit I/O Port Expander | 1.8 - 5.5 | I²C™ | 1700 | 28/QFN, 28/SOIC 300mil, 28/SPDIP, 28/SSOP 208mil |
| MCP23018 | In Production | | $1.09 | 16-bit I/O Port Expander | 1.8 - 5.5 | I²C™ | 3400 | 24/QFN, 24/SSOP 208mil, 28/SOIC 300mil, 28/SPDIP |
| MCP23008 | In Production | | $0.73 | 8-bit I/O Port Expander | 1.8 - 5.5 | I²C™ | 1700 | 18/PDIP, 18/SOIC 300mil, 20/QFN, 20/SSOP 208mil |
| MCP23009 | In Production | | $0.82 | 8-bit I/O Port Expander | 1.8 - 5.5 | I²C™ | 3400 | 16/QFN, 18/PDIP, 18/SOIC 300mil, 20/SSOP 208mil |
| MCP23S17 | In Production | | $0.91 | 16-bit I/O Port Expander | 1.8 - 5.5 | SPI | 10000 | 28/QFN, 28/SOIC 300mil, 28/SPDIP, 28/SSOP 208mil |
| MCP23S18 | In Production | | $1.16 | 16-bit I/O Port Expander | 1.8 - 5.5 | SPI | 10000 | 24/QFN, 28/SOIC 300mil, 28/SPDIP |
| MCP23S08 | In Production | | $0.78 | 8-bit I/O Port Expander | 1.8 - 5.5 | SPI | 10000 | 18/PDIP, 18/SOIC 300mil, 20/QFN, 20/SSOP 208mil |