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TBU-CX025-VTC-WH Datasheet(PDF) 2 Page - Bourns Electronic Solutions

Part # TBU-CX025-VTC-WH
Description  High-Speed Protectors
Download  5 Pages
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Manufacturer  BOURNS [Bourns Electronic Solutions]
Direct Link  http://www.bourns.com
Logo BOURNS - Bourns Electronic Solutions

TBU-CX025-VTC-WH Datasheet(HTML) 2 Page - Bourns Electronic Solutions

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Specifications are subject to change without notice.
The device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time.
Users should verify actual device performance in their specific applications.
TBU-CX Series - TBU® High-Speed Protectors
Reference Application
The TBU® devices are general use protectors used in a wide
variety of applications. The maximum voltage rating of the TBU
device should never be exceeded. Where necessary, an OVP
should be employed to limit the maximum voltage. A cost-
effective protection solution combines Bourns® TBU® protection
devices with a pair of Bourns® MOVs. For bandwidth sensitive ap-
plications, a Bourns® GDT may be substituted for the MOV. See
“Trigger Current vs External Resistor Value” graph for selecting
the optimum trigger current value using a 0 ohm –
50 ohm resistor value.
Note: Line Resistance =
TBU® Device Resistance + Rexternal Resistance
The TBU® device, constructed using MOSFET semiconductor
technology, placed in the 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 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. When operated, the TBU® device will
block all voltages including the surge up to rated limits.
After the surge, the TBU® device resets when the voltage
across the TBU® device falls to the Vreset level. The TBU
®
device will automatically 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.
Basic TBU Operation
Performance Graphs
Typical Trigger Current vs. Temperature
Equip.
OVP
OVP
Line
Line
TBU
®
Device
TBU
External
Resistor
®
Device
R
External
Resistor
R
Typical V-I Characteristics (TBU-CX050-VTC-WH with Rext = 1
Ω)
CURRENT
(100 mA/div)
VOLTAGE
(5 V/div)
ITRIP
VRESET
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
-75
-50
-25
0
25
50
75
100 125
Junction Temperature (°C)
Applications
Voice / VDSL cards
Protection modules and dongles
Process control equipment
Test and measurement equipment
General electronics


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