TCA9509DGKR

Overview

The TCA9509DGKR is a dual-channel bidirectional translating buffer and repeater designed for I2C and SMBus applications. Manufactured by Texas Instruments, it operates within a supply voltage range of 1.65 V to 3.6 V on the A side and 2.7 V to 5.5 V on the B side. The device supports data rates up to 400 kHz and features an absolute propagation delay of 132.8 ns. It is housed in an 8-pin VSSOP package with dimensions of 3.1 mm x 3.1 mm x 0.95 mm. The component functions as a bus interface that allows seamless communication between different voltage domains while maintaining signal integrity.

Feature Summary

• Provides bidirectional level translation between two independent power domains
• Functions as a bus repeater to extend I2C/SMBus network reach
• Supports standard and fast-mode I2C protocols up to 400 kHz

Applications

• Connecting low-voltage microcontrollers to higher-voltage peripheral devices
• Extending I2C bus length in complex embedded systems
• Interfacing mixed-voltage subsystems in industrial control boards

Procurement Notes

Verify the specific suffix DGKR against official Texas Instruments documentation to confirm the VSSOP-8 packaging and tape-and-reel quantity. Ensure compatibility with your system's voltage requirements before procurement. Cross-reference the manufacturer part number with authorized distributors to avoid counterfeit components. Check for RoHS compliance status if required by your manufacturing standards.

Selection Notes

Select this component when interfacing circuits operating at different voltage levels, such as 1.8 V or 3.3 V logic with 5 V peripherals. It is suitable for designs requiring bus isolation or extension without protocol conversion. Consider the 132.8 ns propagation delay for timing-critical applications. Ensure the chosen package fits the available PCB footprint constraints.

Part Context

This part belongs to the TCA9509 series of dual-channel bus interfaces. It is distinct from single-channel buffers like the TCA9517 or multi-channel expanders. The DGKR suffix specifically denotes the VSSOP-8 package variant. It serves as a specialized interface IC rather than a general-purpose logic gate or memory device.

Replacement Considerations

Direct substitutes include other Texas Instruments dual-channel translators such as the TCA9509DR or TCA9509DGR. Verify pinout compatibility and voltage ranges when considering alternatives from other manufacturers. Ensure any replacement maintains the same I2C/SMBus protocol support and package dimensions.