Bypass capacitors

Discussion in 'General Electronics Chat' started by lyndia, Aug 3, 2009.

  1. lyndia

    Thread Starter New Member

    Jul 31, 2009
    4
    0
    Hi,

    I am choosing parts for a PCB I'm designing. While searching for bypass capacitors on Digikey I came across capacitors described as bypass/decoupling capacitors, and they are generally ~0.8 each. I was wondering whether these are really better than general purpose capacitors (less than 0.1 each).

    Thanks
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    293
    Got a part number? And the manufacturer's?
     
  3. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
    2,181
    410

    The "official" decoupling capacitors have generally less parasitic inductance than other types. Depending on the sort of frequency range/switching time your circuit is working at, you may get by will cheaper capacitors. Decoupling PCBs is a bit of an art form.

    eric
     
  4. jpanhalt

    Expert

    Jan 18, 2008
    6,386
    1,225
    Are you referring to the X2Y capacitors? The datasheet for them describes some fairly specialized and high frequency (>10 GHz) applications as well as more mundane ones. They have four terminals.

    John
     
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