PCA9538PW

I/o Expanders Overview

The PCA9538PW is an 8-bit I/O expander manufactured by Texas Instruments, designed for I2C and SMBus interfaces. It operates within a supply voltage range of 2.3 V to 5.5 V and supports a maximum clock frequency of 400 kHz. The device features interrupt output capabilities and includes configuration registers, an interrupt pin, and a reset pin. It is housed in a TSSOP-16 package suitable for surface mount technology (SMD/SMT). 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-driven monitoring
• Features internal configuration registers allowing flexible I/O direction control
• Provides hardware reset capability via a dedicated reset pin

I/o Expanders Applications

• Portable consumer electronics requiring low-power I/O expansion
• Industrial control systems utilizing I2C-based communication networks
• Embedded devices needing additional general-purpose input/output lines

I/o Expanders Procurement Notes

Verify the manufacturer designation on the component marking to confirm it originates from Texas Instruments rather than other vendors like NXP Semiconductors who also produce this part number variant. Ensure the suffix 'PW' corresponds to the TSSOP-16 package type required for your specific PCB layout constraints. Cross-reference the RoHS compliance status with current regulatory requirements before finalizing procurement orders.

I/o Expanders Selection Notes

Select this component when an 8-bit I/O expansion solution is needed with I2C compatibility. The TSSOP-16 package offers a compact footprint compared to larger DIP options. Consider the 2.3 V minimum operating voltage if designing for low-voltage battery-powered applications. Verify that the 400 kHz clock speed meets the timing requirements of the host controller bus.

I/o Expanders Part Context

This component belongs to the PCA9538 series of low-power I/O expanders. It serves as a bridge between microcontrollers and peripheral devices, extending available I/O lines over standard serial buses. The PW suffix specifically denotes the Thin-Shrink Small Outline Package (TSSOP) with 16 leads, distinguishing it from other package variants like DW or DBR.

I/o Expanders Replacement Considerations

The PCA9538PW,118 manufactured by NXP Semiconductors is a publicly confirmed substitute with identical electrical specifications and pinout. Other Texas Instruments variants such as PCA9538PWR share the same core functionality but differ in packaging format.