TBU® High-Speed Protectors

Part Number Information
Part #: Price/Availability:
TBU-CA Buy Now
TBU-DT Buy Now
TBU-PL Buy Now
P40-G Buy Now
P850-G Buy Now
C650 Buy Now
C850 Buy Now

Bourns® TBU® high-speed protectors are circuit protection devices constructed using MOSFET semiconductor technology. When placed in series in the system, the TBU® protector monitors the current flowing through the line. If the current exceeds a preset level, the TBU® device triggers, providing an effective barrier to large, destructive voltages or currents during surge events, thereby protecting sensitive electronics. The TBU® device operates in approximately 1 μs - once line current exceeds the TBU® device’s trigger current Itrigger. When operated, the TBU® device restricts line current to less than 1 mA typically, and blocks voltages including the surge up to rated limits. After the surge, the TBU® automatically resets itself when the voltage across the TBU® device falls to the Vreset or below.  


Bourns® TBU® High Speed Protector Briefing

Bourns TBU Circuit Protection Blocking Technology


  • High-speed performance
  • Blocks voltages and currents
  • Extremely low let-through energy of 100 nJ
  • Self-resetting on non-DC biased lines
  • Very high bandwidth up to 3 GHz
  • Small size in DFN package
  • TBU-PL & TBU-PK series offer voltage triggering
  • Smallest PCB area
  • Ultra low profile


  • Voice / VDSL cards
  • Protection modules and dongles
  • Process control equipment
  • Test and measurement equipment
  • General electronics