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Question about Varistor

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Mac7978

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Dear all,

As i know, varistor is used for EMI and ESD purpose. But, for a GSM handset, which part is needed to protect by it (RF, baseband, or keypad). And also, How should i choose between the varisotr and ESD diode for ESD purpose.

Thx

Best rgds
 

In RF you need a component with low capacitance (for low distorcion) and fast ....

Look this site: **broken link removed**
 

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