PCA8574APW,118

I/o Expanders Overview

The PCA8574APW,118 is a remote 8-bit I/O expander for the I2C-bus manufactured by NXP Semiconductors. It operates within a supply voltage range of 2.3 V to 5.5 V and supports I2C bus frequencies up to 400 kHz. The device features eight quasi-bidirectional ports that default to inputs at power-up, with latched outputs capable of sinking 25 mA per pin and a total package sink capability of 200 mA. It includes an active LOW open-drain interrupt output (INT) and utilizes three hardware address pins to support up to eight devices on a single bus. The component is housed in a TSSOP16 plastic thin shrink small outline package.

I/o Expanders Feature Summary

• Provides general-purpose remote I/O expansion via a two-wire bidirectional I2C-bus interface.
• Features eight quasi-bidirectional ports with latched outputs for direct LED driving.
• Includes an active LOW open-drain interrupt output to notify microcontrollers of input state changes.
• Supports multiple slave addresses through three hardware-selectable address pins.

I/o Expanders Applications

• LED signs and displays
• Industrial control systems
• Medical equipment
• PLCs
• Instrumentation and test measurement

I/o Expanders Procurement Notes

Verify the ordering suffix ',118' corresponds to the Reel 13” Q1/T1 packing method as specified in the official documentation. Confirm the specific variant matches the required address map, as the 'A' designation indicates a distinct fixed portion of the slave address compared to non-'A' variants. Ensure compatibility with the TSSOP16 package dimensions during PCB layout.

I/o Expanders Selection Notes

Select this component when a drop-in replacement for PCF8574/74A series devices is required with improved drive capabilities. Consider the 400 kHz Fast-mode I2C interface and higher sink current limits if system requirements exceed standard specifications. Verify that the operating voltage range of 2.3 V to 5.5 V aligns with the target application's power supply constraints.

I/o Expanders Part Context

This part belongs to the PCA8574 family of remote I/O expanders designed for I2C communication. It serves as a functional upgrade to the PCF8574 series, offering enhanced performance characteristics such as increased bus speed and higher current drive capabilities while maintaining pin-to-pin compatibility with legacy designs.

I/o Expanders Replacement Considerations

The datasheet identifies the PCA8574D as a drop-in replacement for PCF8574T/3, and the PCA8574AD for PCF8574AT/3. For migration to newer packages, the PCA9674 series offers a path with higher bus speeds and additional addressing options.