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TBU™ Circuit Protection Blocking Technology | Bourns

Part Number Information
Part #:Price/Availability:
P500-G120Buy Now button
P500-G200Buy Now button
P850-G120Buy Now button
P850-G200Buy Now button
C650-100Buy Now button
C650-180Buy Now button
C650-260Buy Now button
C850-180Buy Now button
C850-260Buy Now button
P650-U180Buy Now button
P650-U260Buy Now button
P850-U180Buy Now button
P850-U260Buy Now button
P40-G240Buy Now button
TBU-CABuy Now button
TBU-PLBuy Now button
TBU™ Circuit Protection Blocking Technology | Bourns

The TBU™ device, constructed using MOSFET semiconductor, placed in system circuit will monitor the current with the MOSFET detection circuit triggering to provide an effective barrier behind which sensitive electronics are not exposed to large voltages or currents during surge events. The TBU™ device responds in less than 1 µs, once line current exceeds the TBU™ device’s Itrigger (trigger current) point. When operated, the TBU™ device restricts line current to less than 1 mA typically and the TBU™ device will block surge voltages.

After the surge transient dissipates, the TBU™ device resets when the voltage across the TBU™ device falls below the Vreset level. The TBU™ device will always reset on lines which have no DC bias or have DC bias below Vreset (such as unpowered signal lines). If the line has a normal DC bias above Vreset, the voltage across the TBU™ device may not fall below Vreset after the surge. In such cases, special care needs to be taken to ensure that the TBU™ device will reset, with software monitoring as one method used to accomplish this. Bourns application engineers can provide further assistance.

The TBU™ device is provided in a surface mount DFN package and meets industry standard requirements such as RoHS and Pb Free solder reflow profiles and are available in six families: TBU-CA, TBU-PL, P40, P-G (P500-G, P850-G), C (C650 and C850), and P-U (P650-U and P850-U).

Features & Benefits:

  • Meets very high surge requirements
  • Prevents arcing and other damage
  • Offers very high bandwidth for VDSL and VDSL2 applications
  • Meet rate-reach requirements
  • Provides protection against lightning and power cross events
  • Resettable
  • High bandwidth of 3GHz


  • Telecom
  • Industrial
  • Test & Instrumentation
  • Sensors
  • LVDS
  • Transportation

Additional Information: