TBU-CA085-300-WH

Overview

The Bourns TBU-CA085-300-WH is a bidirectional Transient Bus Suppressor (TBU) high-speed protector designed for board-level surge protection. It functions as a solid-state, self-resetting current limiter that blocks transient currents and provides voltage isolation against lightning, power induction, cross-power, and ground potential rise events. The device features an 850V maximum clamping voltage and a 600mA trigger current rating. It operates within a temperature range of -55°C to +125°C and utilizes a DFN surface-mount package.

Feature Summary

• Provides bidirectional surge protection against high-energy transients such as lightning and EPR.
• Acts as a solid-state, self-resetting barrier blocking transient current flow.
• Offers overcurrent and overvoltage protection in a compact surface-mount form factor.

Applications

• Protection of communication ports against induced surges
• Shielding sensitive electronics from ground potential rise events
• Defense against power induction and cross-power interference

Procurement Notes

Verify the specific datasheet revision and manufacturing origin when sourcing this component. Confirm that the DFN package dimensions align with your PCB footprint requirements. Ensure the supplier provides documentation confirming RoHS compliance and UL recognition status prior to final procurement decisions.

Selection Notes

Select this component for applications requiring robust, resettable protection against high-energy bus surges rather than simple ESD events. The 850V clamping capability suits systems exposed to significant transient voltages. Consider the 600mA trigger threshold relative to the normal operating current of the protected line to ensure proper activation during fault conditions.

Part Context

This part belongs to the Bourns TBU-CA series of high-speed protectors. This series variant offers five pulse voltage options and five trigger current ratings, providing flexibility for various industrial and telecom protection schemes. It complements other Bourns overvoltage products to create comprehensive circuit defense strategies.

Replacement Considerations

Consult official Bourns documentation for verified substitute part numbers within the TBU family. Cross-reference trigger currents and clamping voltages carefully when evaluating alternatives to ensure equivalent surge handling performance.