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zener diode look alike component

Discussion in 'General Electronics Chat' started by cax4784, Jan 6, 2009.

  1. cax4784

    cax4784 New Member

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    hi. i'm newbies here. Quit informative website here.. I got a component just like a zener diode with came colour and size but without any part number. A letter of "U1" stated on PCB on its place. Any idea what component it is?
     
  2. kchriste

    kchriste New Member Forum Supporter

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    A picture would help. Maybe. ;)
    U1 usually designates an IC of some kind, but I've never heard of an IC in a 2 lead axial package.
     
  3. Janis1279

    Janis1279 Member

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    Hi.
    Maybe your component is zener diode or diode.
    A letter of "U1" stated on PCB looks similar to
    a letter of "D1" ?
    Some times when removed on PCB fixed components , it damages symbols under components.
     
    Last edited: Jan 7, 2009
  4. dave

    Dave New Member

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  5. Speakerguy

    Speakerguy Active Member

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    U is also the default prefix in a lot of PCB packages (if some careless engineer forgot to change it).
     
  6. duffy

    duffy New Member

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    "Same color as a zener" - ?

    I got blue, red, black and silver zeners. Even zeners aren't the same color as zeners.
     
  7. hxsemic

    hxsemic New Member

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    If you are sure it's a Zener, it can be tested for what voltage value by connecting a power supply vis a resistor 1 to 2k ohms in series. To determine the voltage, it helps to know what kind of circuit you have.

    Power supply must be higher than zener value and this for low voltage zeners only.
    Measure the voltage across the zener. Bear in mind that zeners come in designated voltages like resistor values. They also have tolerances like 5 or 10%. Check the measured voltage to the designated values to determine nearest voltage value.
     

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