PCA9500PW,112

I/o Expanders Overview

The PCA9500PW,112 is an 8-bit I/O expander with integrated 2-kbit EEPROM in a TSSOP16 package. It operates on a supply voltage of 2.5 V to 3.6 V and supports I²C-bus and SMBus interfaces up to 400 kHz. The device features eight quasi-bidirectional data pins that can be independently assigned as inputs or outputs. It includes three hardware address pins allowing up to eight devices on the bus. The internal power-on reset ensures all channels are configured as inputs upon startup.

I/o Expanders Feature Summary

• Drop-in replacement for PCF8574 with integrated non-volatile memory
• Supports hot insertion for removable card applications
• Includes noise filters on SCL and SDA inputs

I/o Expanders Applications

• Board version tracking and configuration
• Multi-card systems in telecommunications and networking equipment
• Field recall and troubleshooting functions for installed boards

I/o Expanders Procurement Notes

Verify the ordering suffix '112' corresponds to the standard marking tube packing method specified in the datasheet. Confirm the package type matches the TSSOP16 outline (SOT403-1). Ensure the component meets the required industrial temperature range of -40 °C to +85 °C before finalizing procurement specifications.

I/o Expanders Selection Notes

Select this component when an I²C interface is required alongside persistent storage for board identification or diagnostic data. It serves as a direct functional substitute for the PCF8574 while adding EEPROM capabilities. Verify that the system voltage falls within the 2.5 V to 3.6 V operating range and that the available I²C addresses accommodate up to eight units on the same bus.

I/o Expanders Part Context

This part belongs to the PCA9500 series of 8-bit I/O expanders manufactured by NXP Semiconductors. The PW suffix indicates the TSSOP16 plastic thin shrink small outline package variant. The device integrates both GPIO expansion and 2-kbit EEPROM functionality into a single IC, appearing as two separate devices to the bus master.

I/o Expanders Replacement Considerations

The PCA9501 is a functionally similar alternative suitable for systems requiring interrupt outputs or higher device density on the I²C bus. For basic GPIO expansion without memory, the PCF8574 remains a compatible drop-in replacement.