PCA9554D,118

I/o Expanders Overview

The PCA9554D,118 is an 8-bit I/O expander from NXP Semiconductors designed for I2C-bus and SMBus applications. It provides General Purpose parallel Input/Output (GPIO) expansion in a 16-lead SOIC package (SOT162-1). The device operates within a supply voltage range of 2.3 V to 5.5 V and supports clock frequencies up to 400 kHz. It features individual I/O configuration, polarity inversion registers, and an active LOW interrupt output. The component includes noise filters on SCL/SDA inputs and an internal power-on reset mechanism.

I/o Expanders Feature Summary

• Provides 8 bits of GPIO expansion with individually configurable input or output directions via the Configuration register.
• Features an open-drain interrupt output that activates when any configured input state differs from its corresponding Input Port register value.
• Includes a Polarity Inversion register allowing users to invert the logic polarity of the Input Port register data.
• Supports hardware-selectable I2C addresses using three pins (A0, A1, A2), enabling up to eight devices on a single bus.

I/o Expanders Applications

• ACPI power switches
• Sensor interfaces
• Push button detection systems
• LED control circuits
• Fan speed monitoring

I/o Expanders Procurement Notes

Verify the specific ordering suffix '118' corresponds to the Reel 13” Q1/T1 packing method as documented in the official NXP datasheet. Confirm the package type matches the SO16 plastic small outline specification (SOT162-1) required for your PCB layout. Ensure the ambient temperature operating range aligns with your system requirements, specifically the -40 °C to +85 °C limit defined for this part number.

I/o Expanders Selection Notes

Select the PCA9554D,118 when an 8-bit I/O expander with interrupt capability is required in a standard SOIC footprint. Consider the PCA9554A variant if a different fixed I2C address base is needed to accommodate more than eight devices on the same bus line. Verify that the 5 V tolerant I/Os meet the voltage levels of your connected subsystems and that the open-drain interrupt output can drive your controller's interrupt pin appropriately.

I/o Expanders Part Context

This component belongs to the PCA9554 family of CMOS I/O expanders developed by NXP Semiconductors. It enhances previous generations by offering higher drive capability, lower supply current, and smaller packaging options compared to legacy parts like the PCF8574 series. While pin-compatible with older devices, software modifications are necessary due to the added features such as polarity inversion and distinct register structures.

I/o Expanders Replacement Considerations

Publicly confirmed substitute part numbers include TCA9554DWR and TCA9554PWR from Texas Instruments. These alternatives offer similar functionality but may require verification of pin compatibility and software register mapping adjustments during integration.