TBU-CA085-500-WH-Q

Overview

The TBU-CA085-500-WH-Q is a bidirectional transient current breaker manufactured by Bourns. It functions as a board-mount surge protector with an 850V voltage rating and a maximum clamping voltage of 850V. The device features a single-diode configuration in a DFN package, measuring 6.5 x 4 x 0.85mm. It operates within a temperature range of -55°C to +125°C and has a maximum reverse standby voltage of 20V. The component triggers at 85mA and supports a peak pulse current of 1A.

Feature Summary

• Provides overcurrent and overvoltage protection for sensitive electronics
• Bidirectional design suitable for AC or DC signal lines
• Integrated trigger mechanism for rapid response to transients

Applications

• Circuit protection for video transcoders
• Surge suppression in RS-485 communication interfaces
• Protection against electrostatic discharge (ESD) events
• Mitigation of lightning-induced surges in input circuits

Procurement Notes

Verify the specific suffix 'Q' when ordering, as it denotes a qualified variant distinct from the standard TBU-CA085-500-WH. Confirm that the trigger current specification aligns with the system's operational requirements before integration. Ensure the DFN footprint matches the PCB layout constraints. Cross-reference the datasheet for any updates on compliance standards such as UL certification.

Selection Notes

Select this component for applications requiring robust protection against high-energy transients without shunting normal operation currents. The bidirectional capability makes it ideal for differential signal lines. Consider the 20V standby voltage limit to ensure compatibility with low-voltage logic levels. The compact DFN package suits space-constrained designs where thermal performance up to 125°C is required.

Part Context

This part belongs to Bourns' TBU (Transient Current Breaker) family, designed to replace traditional fuses and TVS diodes in many scenarios. Unlike standard TVS diodes that may short-circuit during severe faults, TBUs can reset after the fault condition clears. This series offers enhanced reliability for critical infrastructure and industrial equipment protection.

Replacement Considerations

The TBU-CA085-500-WH is the standard version of this component. Verify if the 'Q' suffix indicates specific qualification or packaging differences. Direct substitution requires confirming identical trigger characteristics and package dimensions to avoid rework.