PCA9500D,118

I/o Expanders Overview

The PCA9500D,118 is an 8-bit I/O expander with integrated 2-kbit EEPROM. It features quasi-bidirectional data pins independently assignable as inputs or outputs for board status monitoring or LED activation. The device supports I2C-bus and SMBus interfaces with a clock frequency up to 400 kHz. Operating voltage ranges from 2.5 V to 3.6 V. It includes internal pull-ups on three address pins allowing up to eight devices on the bus. The package is SO16 (SOT162-1).

I/o Expanders Feature Summary

• Drop-in replacement for PCF8574 with integrated non-volatile memory.
• Supports hot insertion for removable card applications.
• Internal power-on reset ensures defined initial state.

I/o Expanders Applications

• Board version tracking and configuration storage.
• Multi-card systems in telecommunications and base station infrastructure.
• Field recall and troubleshooting functions for installed boards.

I/o Expanders Procurement Notes

Verify the ordering suffix matches the required packing method. The '118' suffix indicates reel packaging. Confirm the specific tape and reel dimensions align with automated assembly equipment requirements before finalizing procurement orders.

I/o Expanders Selection Notes

Select this component when an I2C interface with onboard storage is needed. Ensure the system voltage falls within the 2.5 V to 3.6 V range. Verify that the SO16 package fits the PCB footprint constraints and thermal requirements of the design.

I/o Expanders Part Context

This part belongs to the PCA9500 series of I/O expanders. It serves as a direct functional equivalent to the PCF8574 but adds EEPROM capabilities. The D suffix denotes the SO16 plastic small outline package variant within the broader family.

I/o Expanders Replacement Considerations

PCA9500BS,118 (HVQFN16 package) and PCA9500PW,118 (TSSOP16 package) are functionally identical alternatives. Verify package compatibility if substituting.