TBU-DF055-300-WH

Overview

The Bourns TBU-DF055-300-WH is a bidirectional Transient Breakdown Unit (TBU) high-speed protector designed for board-level surge protection. It operates within a peak pulse voltage range of 550V to 850V and features a continuous AC RMS voltage rating of 250V to 425V, depending on the specific variant. The device functions as a solid-state current limiter, providing overcurrent and overvoltage protection in a compact surface-mount DFN package. It supports an operating temperature range from -55°C to +125°C and includes MOSFET detection circuit triggering to isolate sensitive electronics during transient events.

Feature Summary

• Provides effective barrier against short circuits, overvoltage transients, and battery cell failures
• Features MOSFET detection circuit triggering for rapid response to large voltage or current surges
• Acts as a solid-state resettable current limiter to block transient currents and provide voltage isolation

Applications

• RS-485 interface protection
• General electronic equipment
• Factory automation systems
• Process control equipment
• Protection modules and dongles

Procurement Notes

Verify the exact part number suffix and manufacturer documentation to confirm specifications. Ensure compatibility with the intended circuit's voltage and current requirements. Check for RoHS compliance and UL certification status as listed in the official datasheet. Confirm the package type and pin configuration match the design layout.

Selection Notes

Select this component for applications requiring robust protection against lightning, power induction, cross-power, and ground potential rise events. Consider the specific peak pulse voltage and trigger current ratings required for the target application. Evaluate the need for bidirectional protection and the benefits of solid-state resettable functionality over traditional fuses.

Part Context

This component belongs to the Bourns TBU® High-Speed Protector (HSP) series, which are silicon-based solid-state devices. The TBU-DF series specifically offers two pulse voltage options and five trigger current options. These protectors are designed to be placed in series within a circuit to provide superior surge protection compared to standard TVS diodes.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.