Bourns TBU High-Speed Protectors

Bourns Transient Blocking Units (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. After the surge, the TBU automatically resets itself when the voltage across the TBU device falls to the V-reset or below. 

Bourns TBU-CA-Q series high-speed protectors are low-capacitance single bidirectional high-speed protection components designed to protect against faults caused by short circuits, AC power cross, induction, and lightning surges. Bourns TBU-CA-Q high-speed protectors monitor the current in the system circuit with the MOSFET detection circuit triggering to provide an effective barrier from large voltages or currents during surge events.

Features

  • AEC-Q101 compliant
  • Blocks high voltages and currents
  • Blocks surge up to rated limits
  • Extremely high-speed performance
  • Low impedance
  • Overcurrent and overvoltage protection
  • Requires minimal PCB area
  • RoHS compliant
  • Simple, superior circuit protection
  • Small SMT package which takes up minimal PCB area
  • Superior circuit protection
  • Two TBU protectors in one small package
  • UL recognized
  • Very high bandwidth with GHz compatible

Applications

  • Battery management systems
  • Cable and DSL
  • Ethernet ports
  • Exposed sense and data lines
  • Factory automation
  • General electronics
  • High data rate interface IC protection (LVDS, HDMI, etc.)
  • Industrial sensors and controls
  • MDU/MTU modems
  • Process control equipment
  • Protection modules and dongles
  • RS-485 interfaces
  • SLIC protection
  • Test and measurement equipment
  • Voice / VDSL line cards xDSL (ADSL, VDSL, VDSL2)

Technical Specifications

Series Description Maximum impulse voltage
(V)
Maximum RMS voltage
(V)
Trigger current levels
(mA)
Trigger time
(µs)
Footprint
(mm)
Operating temperature range
(°C)
Datasheet
(PDF)
C650 Single Bidirectional

650 300 150, 220, 330 1 8.25 x 4 -40 to +85 C650
C850 Single Bidirectional

850 425 150, 220, 330 1 8.25 x 4 -40 to +85 C850
P40-G Bidirectional 40 28 240 0.2 4 x 4 -55 to +125 P40-G
P500-G Dual Bidirectional 500 300 100, 200 1 6 x 4 -40 to +85 P500-G
P850-G Dual Bidirectional 500, 850 300, 425 100, 200 1 6 x 4 -40 to +85 P850-G
TBU-CA Single Bidirectional 250, 400, 500, 650, 850 100, 200, 250, 300, 425 50, 100, 200, 300, 500 1 6.5 x 4 -55 to +125 TBU-CA
TBU-CA-Q Single Bidirectional 250, 400, 500, 650, 850 100, 200, 250, 300, 425 50, 100, 200, 300, 500 1 6.5 x 4 -55 to +125 TBU-CA-Q
TBU-DB-Q Dual Bidirectional 550 N/A 100 1 6.50 x 5.50 -55 to +125 TBU-DB-Q
TBU-DF Dual Bidirectional 550, 850 250, 425 50, 300, 500 1 6.50 x 5.50 -55 to +125 TBU-DF
TBU-DT Dual Unidirectional 650, 850 300, 425 100, 200, 300, 500 1 5 x 5 -40 to +125 TBU-DT
TBU-PL Dual Bidirectional 500, 600, 750, 850 300, 350, 400, 425 100, 200 1 6.5 x 4 -55 to +125 TBU-PL

Video

This TTI Tech Specs video for Bourns TBU High-Speed Protectors explains that the TBU-CA series is MOSFET-based and transitions from the operating state to the protected state in 1 microsecond or less during surge events, and the device will automatically reset once the line falls below the reset voltage. 

See video transcript below

Video Transcript

Bourns TBU-CA series high-speed protectors are faster than a newly-licensed teenage driver and protect sensitive electronics against shorts, lightning surges, and other faults. The TBU-CA series is MOSFET-based and transitions from the operating state to the protected state in 1 microsecond or less during surge events, and the device will automatically reset once the line falls below the reset voltage.

Products are available that can withstand peak impulses up to 850 volts and continuous overvoltages up to 425 volts RMS. Designers can select the trigger current appropriate to the application, ranging from 75 to 750 milliamps. The devices are low-capacitance and have low series resistance in the operating state, minimizing the impact to the operating circuit. Bourns TBU-CA series high-speed protectors are rated for operation from negative 55 to positive 125 degrees Celsius.

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