TCA9511ADGKR

Overview

The TCA9511ADGKR is a hot-swappable I2C bus and SMBus buffer manufactured by Texas Instruments. It supports bidirectional data transmission for standard mode (up to 100 kHz) and fast mode (up to 400 kHz) devices. The device operates within a supply voltage range of 2.3 V to 5.5 V and functions across an ambient temperature range of -40°C to +125°C. It features a precharge mechanism on SDA and SCL lines to 1 V during insertion to minimize current surges. The component is housed in an 8-pin VSSOP package.

Feature Summary

• Provides isolation between backplane and card-side I2C lines during hot insertion events
• Supports clock stretching, arbitration, and synchronization protocols
• Maintains high-impedance state on I2C pins when powered down

Applications

• I/O card insertion into live backplanes without disrupting bus signals
• Isolating capacitive loads between system backplanes and peripheral cards
• Protecting I2C buses from damage during带电 insertion procedures

Procurement Notes

Verify the specific suffix DGKR corresponds to the tape and reel packaging format required for automated assembly processes. Confirm that the operating environment remains within the specified -40°C to +125°C thermal limits. Ensure the target application voltage stays within the 2.3 V to 5.5 V operational window defined by the manufacturer specifications.

Selection Notes

Select this component when designing systems requiring safe hot-plugging capabilities for I2C or SMBus interfaces. It is suitable for applications needing electrical isolation between distinct board sections during insertion. Consider its low quiescent current and wide supply voltage range for portable or battery-operated equipment designs.

Part Context

This part belongs to the TCA9511A family of bus buffers designed specifically for hot-swappable environments. It serves as a bridge between master and slave devices on I2C networks, ensuring signal integrity during physical connection changes. The DGKR suffix indicates the surface-mount VSSOP-8 package variant optimized for space-constrained PCB layouts.

Replacement Considerations

The PCA9511ADP from NXP Semiconductors is a documented alternative with similar hot-swappable functionality. Verify pin compatibility and electrical characteristics before substitution.