What are these components?

Discussion in 'General Electronics Chat' started by drkblog, Oct 18, 2012.

  1. drkblog

    Thread Starter Member

    Oct 4, 2012
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    Hello. Here we go again :) What are these?

    [​IMG]

    Markings

    1. 07 / K250 / 9538
    2. SCK 2R55A
    3. Gold, Yellow, Green, Brown
    4. 9740J / SFH 617-2 / X001
    5. BY / 206 / F831
    6. Various colors
    7. BZX / 5V6 / 55C

    And: What's a "GLASS PASSIVATED JUNCTION RECTIFIER"?
     
    Last edited: Oct 18, 2012
  2. MrChips

    Moderator

    Oct 2, 2009
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    I am gonna make guesses here:
    1. MOV
    2. MOV
    3. MOV
    4. Bridge rectifier
    5. Diode
    6. Diodes
    7. 5.6V Zener - the only one I am certain of
     
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  3. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,998
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    1,2,3 are Surge protectors, or Inrush limiters (movs)
    4,bridge diodes
    5,6 diodes
    7, 5.6v zener

    All look like they are from a power supply.
     
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  4. drkblog

    Thread Starter Member

    Oct 4, 2012
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    Thank you both!

    I have a bunch of diodes (figure 6) they seem to be silicon (0.6V). But is there any hope of finding out more information?

    5 was a diode, actually, with 528mV tension (silicon I guess).

    Should I keep these MOVs? Is there a chance of using them while designing a circuit?

    Update:

    4 is an optocoupler >> http://www.alldatasheet.com/view.jsp?Searchword=SFH617-2
     
    Last edited: Oct 18, 2012
  5. THE_RB

    AAC Fanatic!

    Feb 11, 2008
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    3 may be a thermistor. Try measuring it's resistance cold and again after holding a soldering iron NEAR it for a while. If so it might be useful. Otherwise if they are all MOVs probably no use to you at all. :)
     
  6. bertus

    Administrator

    Apr 5, 2008
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  7. t06afre

    AAC Fanatic!

    May 11, 2009
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    Most of these components look like they have come from a switch-mode power supply. Number four is certainly not a bridge rectifier. It is a 5.3 kV optocoupler from the SFH617A series quite common in switch-mode power supplies. In picture six. The component with a red band in the middle is most probably an inductor. The rest some kind of diodes I will guess.
     
  8. larryhfish

    New Member

    Oct 11, 2012
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    There are two styles of passivation for rectifiers. Silicone rubber and glass. Rectifiers can absorb moisture through the plastic package. Glass passivation seals the sides of the junction preventing additional leakage current. Silicone rubber is supposed to do the same job, but it is invariably not so good. Pay any extra cost you have to for the glass passivation or your rectifiers will fail after just a few weeks.
     
  9. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    Why should any modern rectifier in plastic package fail after a few weeks? Not to say an IC in a plastic package?
    What you claim souds fishy to me.
     
  10. THE_RB

    AAC Fanatic!

    Feb 11, 2008
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    Sorry but I believe they are all glass diodes. That one with a red band is a common look for a 400mW zener.
     
  11. drkblog

    Thread Starter Member

    Oct 4, 2012
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    Thank you guys!
     
  12. t06afre

    AAC Fanatic!

    May 11, 2009
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    Might very well be so. At the first glance it looked like an inductor. But i have been proved wrong before in this forum:eek:
     
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