PCA9517DG4

Signal Buffers, Repeaters, Splitters Overview

The PCA9517DG4 is a level-translating I2C bus repeater manufactured by Texas Instruments. It facilitates communication between I2C/SMBus devices operating at different voltage levels, supporting standard mode (100 kHz) and fast mode (400 kHz). The device features an active-low enable input to control operation. It is designed to isolate bus segments, protecting upstream components from faults on downstream lines. The component is housed in an 8-pin Small Outline package (SOIC), specifically the DGK or similar variant depending on suffix, with industrial temperature range capabilities.

Signal Buffers, Repeaters, Splitters Feature Summary

• Performs bidirectional level translation between two distinct voltage domains for I2C and SMBus protocols.
• Provides electrical isolation between bus segments to protect host controllers from short circuits or excessive current draw on peripheral lines.
• Includes an active-low enable pin to selectively activate or deactivate the repeater function.

Signal Buffers, Repeaters, Splitters Applications

• Connecting low-voltage microcontrollers to higher-voltage I2C sensors or peripherals.
• Isolating sensitive system buses from potentially faulty or high-capacitance sensor arrays.
• Interfacing mixed-voltage subsystems within automotive or industrial control units.

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the specific tape-and-reel quantity and RoHS compliance status directly with the manufacturer or authorized distributors before ordering. Confirm that the DG4 suffix denotes lead-free packaging and matches the required environmental standards for your assembly process. Ensure the SOIC-8 package dimensions align with your PCB footprint design rules.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when bidirectional level shifting is required between I2C masters and slaves operating at different supply voltages. It is suitable for applications needing bus isolation to prevent fault propagation. Compare against alternatives like the TCA9517 if automotive qualification (AEC-Q100) is not strictly required, as the TCA9517 offers similar functionality with potential automotive-grade reliability benefits.

Signal Buffers, Repeaters, Splitters Part Context

The PCA9517 series belongs to Texas Instruments' interface IC portfolio, specifically designed for I2C bus expansion and protection. It serves as a bridge between different voltage domains, ensuring signal integrity while maintaining protocol compatibility. This family includes variants such as the PCA9517A and the automotive-grade TCA9517, offering options for different performance and reliability requirements.

Signal Buffers, Repeaters, Splitters Replacement Considerations

The TCA9517DRG4 is a direct functional equivalent with automotive qualification. The PCA9517A provides similar level-shifting capabilities. Verify pinout compatibility and voltage range specifications when substituting to ensure seamless integration without hardware redesign.