PCA9555DBQR

I/o Expanders Overview

The PCA9555DBQR is a remote 16-bit I/O expander designed for I2C and SMBus interfaces, manufactured by Texas Instruments. It operates within a supply voltage range of 2.3V to 5.5V and supports clock frequencies up to 400 kHz. The device features push-pull outputs capable of sourcing or sinking 10mA or 25mA. It is housed in a 24-SSOP package with a width of 3.90mm. The component includes an interrupt output pin and power-on reset (POR) functionality. It is rated for operation between -40°C and +85°C. This specific part number is classified as obsolete and no longer in production.

I/o Expanders Feature Summary

• Provides 16 bidirectional digital input/output channels via serial interface
• Includes dedicated interrupt output pin for efficient event handling
• Supports standard I2C and SMBus communication protocols
• Features configuration registers for individual pin direction control

I/o Expanders Applications

• Remote I/O expansion in embedded systems
• Consumer electronics requiring additional GPIO pins
• Industrial control panels with limited microcontroller ports
• Automotive infotainment systems

I/o Expanders Procurement Notes

Verify component authenticity carefully as the PCA9555DBQR is officially obsolete. Check datasheet revisions and manufacturing dates against current inventory sources. Confirm that replacement parts meet identical electrical specifications and pin compatibility requirements before integration into existing designs.

I/o Expanders Selection Notes

Consider the TCA9555 series for active alternatives with similar functionality but potentially different voltage ranges. Evaluate package availability and lead times for substitute components. Ensure that any replacement maintains compatibility with existing PCB footprints and software drivers to minimize redesign efforts.

I/o Expanders Part Context

This component belongs to the PCA9555 family of I/O expanders from Texas Instruments. It serves as a bridge between microcontrollers and peripheral devices needing additional digital lines. The DBQR suffix indicates a tape-and-reel packaging format suitable for automated assembly processes in high-volume manufacturing environments.

I/o Expanders Replacement Considerations

Public confirmed substitutes include PCA9555DBR and PCA9555DWR. Verify pinout compatibility and electrical characteristics before substitution.