PCA9501PW,118

Overview

The PCA9501PW,118 is an 8-bit I/O expander with integrated 2-kbit EEPROM in a TSSOP20 package. It operates on a 2.5 V to 3.6 V supply and supports I2C/SMBus interfaces up to 400 kHz. The device features eight quasi-bidirectional I/O pins, an active LOW open-drain interrupt output, and six hardware address pins allowing up to 64 devices on the bus. It includes internal pull-ups, power-on reset, and noise filters.

Feature Summary

• Integrates 2-kbit EEPROM for board configuration and diagnostic data storage
• Supports hot insertion and multi-device addressing via six hardware address pins
• Provides active LOW interrupt output triggered by input state changes
• Features 5 V tolerant inputs/outputs and robust ESD protection

Applications

• Board version tracking and configuration
• Multi-card systems in telecom and networking infrastructure
• Board health monitoring and status reporting
• Field recall and troubleshooting functions for installed boards

Procurement Notes

Verify the specific ordering suffix '118' corresponds to the TSSOP20 package variant when sourcing. Confirm RoHS compliance and REACH SVHC status through official manufacturer documentation or certificates of analysis provided by authorized distributors prior to integration into production designs.

Selection Notes

Select this component when replacing PCF8574 devices requiring non-volatile memory capabilities. Ensure the system voltage falls within the 2.5 V to 3.6 V range. Verify that the required number of I/O lines does not exceed eight and that the I2C bus speed requirements are compatible with the 400 kHz maximum clock frequency specification.

Part Context

This part belongs to the PCA9501 series of I/O expanders manufactured by NXP Semiconductors. It serves as a direct replacement for legacy PCF8574 components while adding integrated EEPROM functionality. The series includes variants in SO20 and HVQFN20 packages, offering flexibility for different thermal and spatial constraints in embedded applications.

Replacement Considerations

The PCA9501 is explicitly documented as a replacement for the PCF8574. No other substitute part numbers are listed in the official datasheet.