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Bourns ? TBU ? Product Overview
I OP
1/R
Reset V
Basic TBU ? Device Operation
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
I trigger . 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 V reset or
below. Therefore, the TBU? device will automatically reset
on lines which have no DC bias or have DC bias below
V reset (such as unpowered signal lines).
If the line has a normal DC bias above V reset , the voltage
across the TBU? device may not fall below V reset after
the surge. In such cases, special care needs to be taken
to ensure that the TBU? device will reset; software
monitoring may be used to accomplish this task. Bourns
application engineers can provide further assistance.
Key Features:
?  TBU? device is used in series with the line
?  TBU? device is triggered by current rise
?  TBU? device can block voltages up to 850 V, enabling
easy coordination
?  TBU? device provides superior protection in less than 1 μs
?  TBU? device resets on voltage
?  TBU? device offers an extremely low capacitance per line
Key Benefits:
?  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
TBU-VI Curve
I
Forward
Trigger
Current
Residual
Reset
Reset Current
Voltage
Threshold
Voltage
Threshold
-I OP
TBU-based Solution Device Selection
Reverse
Trigger
Current
Step 1: Current characterization:
Determine the peak system operating current and maximum operating ambient temperature. Use the TBU?
device data sheet’s “trigger current versus temperature” derating curve to determine the TBU? device derating value.?
Step 2: Overvoltage selection:
Select an overvoltage device that has the lowest available DC breakdown voltage greater than the normal system
voltages and any expected AC power faults. The selected device must also be capable of handling the required
lightning current.
Step 3: TBU? device selection:
Choose a TBU? device with a maximum impulse voltage (V imp ) greater than the maximum impulse breakover
or clamping voltage of the selected overvoltage protector. The selected TBU? device must also have a?minimum
specified I trigger above the maximum peak system operating current compensating for the temperature derating.
Step 4: Tertiary protection:
In most applications, the protected circuit sources sufficient current to trigger the TBU? device.?If the protected
circuit impedance is high, a small avalanche diode to ground or small signal diodes clamping to the power
supply rails may be placed after the TBU? device. This will ensure that the TBU? device triggers, preventing
the voltage at the interface from rising to unsafe levels.
2
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TBU-DT065-100-WH 功能描述:浪涌抑制器 Dual Unidirectional TBU Device RoHS:否 制造商:Bourns 电压额定值:40 V 电流额定值:750 mA 工作温度范围:- 40 C to + 125 C 端接类型:SMD/SMT 封装 / 箱体:
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TBU-DT065-300-WH 功能描述:浪涌抑制器 Dual Unidirectional TBU Device RoHS:否 制造商:Bourns 电压额定值:40 V 电流额定值:750 mA 工作温度范围:- 40 C to + 125 C 端接类型:SMD/SMT 封装 / 箱体:
TBU-DT065-500-WH 功能描述:浪涌抑制器 Dual Unidirectional TBU Device RoHS:否 制造商:Bourns 电压额定值:40 V 电流额定值:750 mA 工作温度范围:- 40 C to + 125 C 端接类型:SMD/SMT 封装 / 箱体:
TBU-DT085-100-WH 功能描述:浪涌抑制器 Dual Unidirectional TBU Device RoHS:否 制造商:Bourns 电压额定值:40 V 电流额定值:750 mA 工作温度范围:- 40 C to + 125 C 端接类型:SMD/SMT 封装 / 箱体:
TBU-DT085-200-WH 功能描述:浪涌抑制器 Dual Unidirectional TBU Device RoHS:否 制造商:Bourns 电压额定值:40 V 电流额定值:750 mA 工作温度范围:- 40 C to + 125 C 端接类型:SMD/SMT 封装 / 箱体:
TBU-DT085-300-WH 功能描述:浪涌抑制器 Dual Unidirectional TBU Device RoHS:否 制造商:Bourns 电压额定值:40 V 电流额定值:750 mA 工作温度范围:- 40 C to + 125 C 端接类型:SMD/SMT 封装 / 箱体:
TBU-DT085-500-WH 功能描述:浪涌抑制器 Dual Unidirectional TBU Device RoHS:否 制造商:Bourns 电压额定值:40 V 电流额定值:750 mA 工作温度范围:- 40 C to + 125 C 端接类型:SMD/SMT 封装 / 箱体: