PCA9539PW

I/o Expanders Overview

The PCA9539PW is a low-power 16-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 16 general-purpose digital input/output pins with open-drain outputs capable of sourcing 25 mA. It includes configuration registers, an interrupt output pin, and a reset pin for system control. Operating temperatures range from -40°C to +85°C, and the component is housed in a TSSOP-24 package.

I/o Expanders Feature Summary

• Supports I2C and SMBus serial communication protocols
• Includes dedicated interrupt output and reset pins
• Configurable input/output direction via internal registers

I/o Expanders Applications

• Portable battery-powered systems requiring low power consumption
• Industrial control panels using SMBus interfaces
• Consumer electronics with limited GPIO availability

I/o Expanders Procurement Notes

Verify the specific suffix 'PW' corresponds to the TSSOP-24 package variant when sourcing. Confirm RoHS compliance status through official manufacturer documentation or authorized distributor datasheets prior to procurement. Ensure the component meets environmental specifications for the intended operating temperature range.

I/o Expanders Selection Notes

Select this component when a 16-bit expansion solution is required for I2C-based designs. Consider the TCA9539 series if operation below 2.3 V or improved power-on-reset robustness is necessary. Verify that the TSSOP-24 package dimensions fit the target PCB layout constraints.

I/o Expanders Part Context

The PCA9539 belongs to the PCA95xx family of I/O expanders from Texas Instruments. This series provides general-purpose remote I/O expansion for microcontrollers. The PCA9539 specifically targets applications needing multiple digital inputs/outputs over standard serial buses while maintaining low current consumption.

I/o Expanders Replacement Considerations

The TCA9539 is a direct functional replacement with enhanced power-on-reset characteristics. Other variants include PCA9539DB (SSOP-24) and PCA9539RGER (VQFN-24). Verify package compatibility before substitution.