PCA9538DB

I/o Expanders Overview

The PCA9538DB is an 8-bit I/O expander designed for I2C and SMBus interfaces, manufactured by Texas Instruments. It operates within a supply voltage range of 2.3 V to 5.5 V and supports clock frequencies up to 400 kHz. The device features interrupt output capabilities and includes configuration registers, an interrupt pin, and a reset pin. It is housed in an SSOP-16 package suitable for surface mount installation. The component functions across a temperature range of -40°C to +85°C and provides ESD protection rated at 2 kV.

I/o Expanders Feature Summary

• Supports I2C and SMBus serial communication protocols for system integration
• Includes dedicated interrupt output functionality for event monitoring
• Features configurable input/output pins with internal configuration registers

I/o Expanders Applications

• General purpose I/O expansion in embedded systems
• Interface extension for microcontrollers via I2C bus
• Low power I/O management in portable devices

I/o Expanders Procurement Notes

Verify the current lifecycle status as the component is listed as End-of-Life. Confirm availability through authorized distributors or surplus suppliers. Ensure the SSOP-16 package matches the target PCB footprint. Check RoHS compliance documentation before procurement. Validate that the 2.3 V to 5.5 V operating range aligns with the system power design.

I/o Expanders Selection Notes

Select this component when an 8-bit I/O expander with I2C interface is required. Ensure the system voltage falls within the 2.3 V to 5.5 V range. Verify that the SSOP-16 package fits the board layout constraints. Consider the interrupt pin requirement if real-time status monitoring is needed. Compare against other PCA9538 variants for package differences.

I/o Expanders Part Context

The PCA9538DB belongs to the PCA9538 series of low-power I/O expanders from Texas Instruments. This series provides remote I/O expansion via standard two-wire serial interfaces. The DB suffix indicates the SSOP-16 package variant. Other variants include DGVR and DW packages offering different form factors for similar electrical performance.

I/o Expanders Replacement Considerations

Check for TCA9538DBRG4 as a potential alternative within the same family. Verify package compatibility and voltage range alignment. Confirm interface protocol support remains consistent. Evaluate lifecycle status of substitutes to ensure long-term availability.