TBU-DF085-100-WH

Overview

The Bourns TBU-DF085-100-WH is a dual unidirectional transient current limiter designed for board mount surge protection. It features an 850 V voltage rating and a 200 mA current rating, operating within a temperature range of -40°C to +85°C. The device utilizes SMD/SMT termination in a DFN package, providing overcurrent and overvoltage protection for Ethernet ports, protection modules, dongles, and test equipment.

Feature Summary

• Provides solid-state resettable protection against transient currents and voltage spikes
• Acts as a series barrier to block surge energy while maintaining voltage isolation
• Dual unidirectional configuration suitable for differential signal lines

Applications

• Ethernet port protection
• Protection modules and dongles
• Test equipment

Procurement Notes

Verify the specific suffix WH against the manufacturer datasheet to confirm packaging and tape/reel specifications. Ensure the component meets RoHS compliance requirements for the target assembly process. Cross-reference the UL certification status if required by end-product safety standards. Confirm the DFN package dimensions match the PCB footprint design.

Selection Notes

Select this component when dual unidirectional protection is required for high-speed data lines exposed to lightning or power induction surges. The 850 V rating supports applications with higher potential transient voltages compared to lower-rated variants. Consider the 200 mA holding current limit relative to the operational signal current to prevent nuisance tripping during normal operation.

Part Context

This part belongs to the TBU-DT series of high-speed protectors from Bourns. These devices are engineered as effective barriers that interrupt fault currents rapidly. The series offers various pulse voltage and trigger current combinations to suit different interface speeds and surge immunity levels.

Replacement Considerations

Consult official substitution lists for equivalent TBU-DT series parts with matching voltage and current ratings. Verify pin compatibility and thermal characteristics before replacing with other manufacturers' transient current limiters.