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Low leakage capacitors

Discussion in 'Electronic Components' started by Paul, May 1, 2009.

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  1. Paul

    Paul Guest

    Hi,

    I'm trying to find the lowest leakage capacitor, somewhere in the
    range of 0.01uF to 1uF, *might* be able to live with 0.001uF, for DC
    use. I'm not sure if PTFE (teflon) is the best choice, but here's one
    -->

    http://www.cde.com/catalogs/MCM-MIN.pdf

    It says, "Insulation Resistance: 1000 M¥Ø*¥ìF Need not exceed 100,000 M¥Ø
    at 25 ¨¬C" What exactly do they mean by "Need not exceed 100,000 M¥Ø" ?

    Also I heard polystyrene is good.

    I've performed various RC time constant tests on caps by placing a
    voltage source on the cap for a period of time, removing the voltage
    source and time it, then measure the DC voltage after a certain time
    period, and calculate the parallel resistance. It appears that the
    longer the voltage source is held on the cap results in more parallel
    resistance-- possibly dielectric absorption.

    So this makes it more difficult to find the best type of caps for this
    use. IOW, perhaps one cap might have less leakage after 1 minute, but
    after 10 hours perhaps another type of cap might have less leakage.

    I'm looking for a cap that would contain as much charge as possible
    for about one day. The voltage levels are around 1 volt.

    Any help is greatly appreciated!
    Paul
     
  2. Baron

    Baron Guest

    Have you considered glass !
     
  3. Baron

    Baron Guest

  4. Guest

    re : lowest leakage caps :
    a high voltage film like teflon or polysulfone would be ok if space is
    not a problem.
    Otherwise ELNA makes low leakage caps the size of regular RB and RT
    electros,
    specifically designed for timing circuits.

    jcdrisc
     
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