Bourns TBU®-DF Dual Channel High-Speed Protectors

Bourns TBU®-DF Dual Channel High-Speed Protectors offer superior circuit protection and a peak impulse voltage range of 550V to 850V. These TBU protectors protect against faults caused by short circuits, overvoltage transients, and faults in battery cells. The series features MOSFET detection circuit triggering that provides an effective barrier to protect sensitive electronics from large voltages or currents during transient events. Bourns Dual Channel TBU High-Speed Protectors are ideal for RS-485 interfaces, general electronics, and factory automation applications. 


  • Superior circuit protection
  • Overcurrent protection
  • Blocks surges up to rated voltage limit
  • High-speed performance
  • Small SMT package
  • RoHS compliant


  • 550V to 850V Vimp peak impulse voltage
  • 250V to 425V Vrms continuous AC RMS voltage
  • -55°C to +125°C operating temperature range
  • -65°C to +150°C storage temperature range
  • +125°C maximum ambient temperature


  • RS-485 interfaces
  • Exposed sense and data lines
  • Factory automation
  • Protection modules and dongles
  • Process control equipment
  • Test and measurement equipment
  • General electronics
Published: 2018-11-07 | Updated: 2022-11-15