Bourns TBU®-DB-Q High-Speed Protectors

Bourns TBU®-DB-Q High-Speed Protector is a bidirectional, dual-channel, and AEC-Q101-compliant high-speed protector for use in automotive applications. This precise and fast-switching protector is constructed using MOSFET technology and is designed to protect against faults caused by short circuits and overvoltage transients/faults. Bourns TBU-DB-Q High-Speed Protector monitors the current with its MOSFET detection circuit, triggering precisely and quickly within 1μs. This module provides an effective barrier to protect sensitive electronics from exposure to large currents during transient events.


  • Superior circuit protection
  • Overcurrent protection
  • Blocks surges up to rated voltage limit
  • High-speed performance
  • 6.5mm x 5.5mm x 0.9mm (L x W x H) SMT package
  • RoHS compliant
  • AEC-Q101 compliant


  • 550V peak impulse voltage withstand with duration less than 10ms
  • 450V peak DC voltage withstand with duration less than 1 hour
  • 150mA current rating
  • 100mA trigger current levels
  • 1µs trigger time
  • -55°C to +125°C operating temperature range


  • RS-485 interfaces
  • Exposed sense and data lines
  • Factory automation
  • Automotive battery management systems
  • Protection modules and dongles
  • Process control equipment
  • Test and measurement equipment


Reference Application

Bourns TBU®-DB-Q High-Speed Protectors
Published: 2018-07-25 | Updated: 2022-11-15