PCA9557PWT

I/o Expanders Overview

The PCA9557PWT is a remote 8-bit I2C and SMBus low-power I/O expander manufactured by Texas Instruments. It operates within a supply voltage range of 2.5 V to 6 V and supports clock frequencies up to 400 kHz. The device provides eight general-purpose I/O pins with configuration registers for input or output selection. It is housed in a TSSOP-16 surface-mount package and functions reliably across an operating temperature range of -40°C to +85°C. The component includes ESD protection rated at 2 kV.

I/o Expanders Feature Summary

• Supports I2C and SMBus serial communication protocols for system integration
• Includes configuration registers to define pin directionality
• Designed for low-power operation in remote expansion scenarios

I/o Expanders Applications

• Remote I/O expansion in embedded systems
• Consumer electronics requiring additional digital control lines
• Industrial control interfaces utilizing I2C buses

I/o Expanders Procurement Notes

Verify the specific suffix PWT against the manufacturer's current datasheet to confirm the tape-and-reel packaging format and quantity. Confirm RoHS compliance status through official documentation before procurement. Check for end-of-life notices as availability may be restricted.

I/o Expanders Selection Notes

Select this component when an 8-bit I/O expansion solution is required with I2C connectivity. Ensure the system voltage aligns with the 2.5 V to 6 V operating range. Verify that the TSSOP-16 package fits the PCB layout constraints and thermal requirements.

I/o Expanders Part Context

This part belongs to the PCA9557 series of I/O expanders from Texas Instruments. It shares core functionality with variants like the PCA9557DT and PCA9557RGYR, differing primarily in package type such as SOIC-Narrow-16 or VQFN-16. All variants maintain the same electrical specifications and interface capabilities.

I/o Expanders Replacement Considerations

Direct replacements include PCA9557DT (SOIC-16) and PCA9557RGYR (VQFN-16). Verify pin compatibility and package dimensions before substitution. Cross-reference with NXP PCA9557BS for functional equivalence.