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- Power Semi-conducter
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- Lightning Surge Protection Circuit
Lightning Surge Protection Circuit
Select products by the circuit board you will use.
Lightning surge protection circuit
The surge protection element is a thyristor type semiconductor element that conducts by applying a specified voltage.
It is widely used as a lightning surge protection in communication equipment.
1 TSS: Thyristor type silicon surge protection element. It absorbs guided thunder superimposed on the communication line and protects communication equipment.
Symbol
Features
- 1 Fast response
- Very fast operation against high pressure surge is possible.
- 2 Automatic recovery
- The tyristor type surge protection element can design the holding current (IH) to be large and automatic circuit recovery possible.
- 3 Low junction capacitance (Cj)
- It can be used for analog or digital communication systems.
- 4 Extensive lineup
- The optimum product can be selected from the surge current rating 30～350A(10/1000µs)
- 5 Application example
- The steep surge is absorbed by the surge protection element, and the surge of a particularly large energy can be effectirvely protected by using gas tube arrester (GDT) or zinc oxide varistor in combination.
Selection procedure
- 1 Determining the off voltage VDRM.
- The off voltage VDRM is determined from the maximum power supply voltage VB applied to the device
- 2 Determining the clamping voltage VCL
- The clamping voltage VCL is determined from the maximum withstand voltage of the circuit (IC, LSI) to be protected.
- 3 Determining the surge resistance ITSM
- The surge capability ITSM of the device is determined from the supposed surge current waveform.
- 4 Determining the holding current IH
- The circuit short-circuit current IL is obtained from the maximum power supply voltage VB and the circuit impedance RL and IL>HL is gauranteed as self-restoration operation after the surge protection element operation. (Check the temperature characteristic chart because the holding current IH has temperature dependence)
- 5 Confirming the junction capacitance
- Consider the dull waveform with high frequency and confirm the junction capacitance Cj of the surge protection element.
