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???
02/06/06 20:11
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Msg Score: +1
 +1 Good Answer/Helpful		 #109335 - quick answer
Responding to: ???'s previous message
Farshid said:
What should be the resistance of the ferrite in higher frequencies 100 ,200,400,500,600 ?

The more the better!

Two more points are important:

1. Performance at 1GHz:
Choose a ferrite bead, which shows an impedance of more than 200 Ohm at 1GHz.

2. Current rating:
Current rating of ferrite bead should exceed actual flowing DC-current by a factor of 10...20. Otherwise impedance versus frequency plot becomes flat. This has to do with the saturation of ferrite material.

For DC-currents lower than 50mA I use the '742 792 651' and for much higher currents up to 6A the '742 793 2', both from 'Würth Elektronik'.

Datasheets can be found here:

http://www.we-online.de/eisos/pdf/742792651.pdf

http://www.we-online.de/eisos/pdf/7427932.pdf

Kai

List of 34 messages in thread
TopicAuthorDate
Quick 'Ferrite Bead' Question            01/01/70 00:00      
   quick answer            01/01/70 00:00      
      I'll use 500s            01/01/70 00:00      
         Picture?            01/01/70 00:00      
            They are SMD !            01/01/70 00:00      
               0805 better than 1206            01/01/70 00:00      
                  Most of the stock here are            01/01/70 00:00      
                     Depends on ferrite material            01/01/70 00:00      
                        Ok , I'll do my best to buy a documented            01/01/70 00:00      
                           off topic, but alas            01/01/70 00:00      
                              deux chevaux            01/01/70 00:00      
                                 yes, but different horses            01/01/70 00:00      
                           Trabant, a funny and sad object            01/01/70 00:00      
                              what is sad about that            01/01/70 00:00      
                                 Because...            01/01/70 00:00      
                                    and when it nis modified            01/01/70 00:00      
                                       Misleading the world...            01/01/70 00:00      
                                          Could it be true...            01/01/70 00:00      
                                             Don't forget a large part ...            01/01/70 00:00      
                                                English, not British...            01/01/70 00:00      
                                             anything can be true, of course, but            01/01/70 00:00      
                              Re : How much it weight ?            01/01/70 00:00      
                                 Probably light enough...            01/01/70 00:00      
                        Back to Topic            01/01/70 00:00      
                           nope            01/01/70 00:00      
                              Are you sure?            01/01/70 00:00      
                                 of course not            01/01/70 00:00      
                                    You are right            01/01/70 00:00      
                                       Unilke ,I think you're pretty moderate            01/01/70 00:00      
                                          Thanks            01/01/70 00:00      
                                          sometimes it is and sometimes it is not            01/01/70 00:00      
                                             lessons            01/01/70 00:00      
                                                do not worry            01/01/70 00:00      
                                             Still no harm            01/01/70 00:00      

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