TCA6424RGJR

Overview

The TCA6424RGJR is a low-voltage, 24-bit I/O expander from Texas Instruments designed for I2C and SMBus interfaces. It operates within a supply voltage range of 1.65 V to 5.5 V, supporting bidirectional voltage translation between the P-port and SDA/SCL lines. The device features a maximum clock frequency of 400 kHz and includes an interrupt output capability. It is housed in a 32-UQFN (5x5 mm) package with exposed thermal pad. Operating temperatures span from -40°C to +85°C, with a typical quiescent current of 8 µA and output drive capabilities of 10 mA or 25 mA depending on configuration.

Feature Summary

• Bidirectional voltage level translation allows communication between microcontrollers operating at lower voltages and peripheral components connected to higher voltage rails.
• Integrated open-drain interrupt output signals state changes on input ports to the host controller without continuous bus polling.
• Hardware-configurable I2C address selection enables multiple devices to share the same bus interface.

Applications

• Remote I/O expansion for microcontroller systems requiring additional digital inputs and outputs.
• Driving LEDs directly from P-port outputs due to high current absorption capabilities.
• Interfacing with peripherals where power domains differ between the processor and external components.

Procurement Notes

Verify the specific suffix against the manufacturer's latest documentation to confirm package type and tape/reel specifications. Confirm RoHS compliance status through official datasheets prior to integration. Ensure the exposed thermal pad connection strategy aligns with PCB layout requirements for thermal management and electrical grounding.

Selection Notes

Select this component when a system requires 24 general-purpose I/O lines accessible via standard I2C protocols. It is suitable for designs needing wide supply voltage flexibility to bridge different logic levels. Consider the 32-UQFN package constraints regarding soldering profiles and thermal dissipation needs during the layout phase.

Part Context

This part belongs to the TCA6424 series of I/O expanders. It shares functional similarities with other Texas Instruments I2C expanders but is distinct in its 24-bit capacity and specific voltage translation architecture. The RGJR suffix denotes the specific UQFN-32 packaging variant offered by the manufacturer.

Replacement Considerations

Consult the TCA6424A datasheet for potential pin-compatible alternatives within the same family. Verify that any substitute maintains the 1.65 V to 5.5 V operating range and 400 kHz interface speed. Ensure the replacement supports the required 24 I/O count and interrupt functionality.