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The MCP23S08T-E/ML is an 8-bit SPI interface I/O expander in a 20-QFN (4×4mm) package, designed specifically for embedded systems that require GPIO expansion via a serial interface. The device communicates with the host MCU via the SPI bus and can flexibly configure eight general-purpose I/O pins as inputs or outputs, making it suitable for applications such as industrial control, consumer electronics, and IoT devices.

Core Advantages (MCP23S08T-E/ML)

SPI High-Speed Communication: Supports a 10MHz clock frequency for fast data transmission.

Wide Voltage Range: Operates within a 1.8V to 5.5V power supply range, compatible with 3.3V/5V systems.

High Drive Capability: Each I/O pin supports 25mA sink/source current, capable of directly driving LEDs or relays.  

Interrupt Function: Configurable interrupt output reduces polling overhead on the host MCU.  

Industrial-Grade Reliability: Operating temperature range of -40°C to +125°C, suitable for harsh environments.

Product Features (MCP23S08T-E/ML)

8-bit port expander with interrupt output

2 address inputs, supporting up to 4 devices on a single bus

Each I/O port has 25mA sink/source current capability

Supports up to 10MHz SPI™ clock speed

Built-in power-on reset (POR) function

Product Attributes (MCP23S08T-E/ML)

Manufacturer:    Microchip         

Mounting Style:    SMD/SMT    

Package/Case:    QFN-20    

Interface Type:    Serial, SPI    

Number of I/O Pins:    8 I/O    

Interrupt Output:    With Interrupt    

Minimum Supply Voltage:    1.8 V

Supply Voltage - Maximum:    5.5 V    

Maximum Clock Frequency:    10 MHz    

Minimum Operating Temperature:    -40°C    

Maximum Operating Temperature:    +125°C

Operating Supply Current:    1 mA    

Operating Supply Voltage:    1.8 V to 5.5 V    

Pd - Power Dissipation:    700 mW

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