CMOS blew

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Discussion in 'General Electronics Chat' started by R!f@@, Feb 11, 2012.

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  1. Feb 11, 2012 #1
    R!f@@

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    Would a 74HC series IC blow with 12V applied. :confused:

    I say yes, cause one did at my face.:eek:
     
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  2. Feb 11, 2012 #2
    MrChips

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    Didn't you check the specs? Vcc max is 7V.
     
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  3. Feb 11, 2012 #3
    R!f@@

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    No kiddin!

    I was going thru my junk and I happen to find an LCD with a couple of 7 seg digits. it has 74HC's all thru out. I just thought I could use the LCD in a project with numeric digits.

    As I happen to have a 12V battery near by, I just jumped the supply cap...with some wires which also was near by..:cool:

    The LCD lit to my surprise with 8's or 0's :D , I'm not sure and then bang ! :eek:. A shrapnel hit my face....so I searched and found it to 74HC393.

    I had been coned..I always thought the HC series can handle more than 12V
     
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  4. Feb 11, 2012 #4
    SgtWookie

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    The C series can handle more than 7v. The HC, HCT versions cannot.
     
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  5. Feb 11, 2012 #5
    t06afre

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    Ah... the golden rule in electronics. NEVER EVER assume. The moment you assume. The probability of being wrong is 99.99%
     
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  6. Feb 11, 2012 #6
    mik3

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    But assumptions is what makes electronics design possible or easier. :cool:
     
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  7. Feb 11, 2012 #7
    kubeek

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    And that is why the path of the designer is beset by dead circuits on all sides ;)
     
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  8. Feb 11, 2012 #8
    Wendy

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    I have had finger brands of parts manufacturers in mirror image, thought fortunately they healed over time. I have also destroyed protoboards (multiple), with great big melted spots where the parts used to be. I have turned capacitors into foil popcorn. I have left craters in chips where silicon used to be.

    In other words, this is normal.
     
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  9. Feb 11, 2012 #9
    R!f@@

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    If it was a MOSFET....then it could have been normal :D

    Blowing IC's is a first .
     
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  10. Feb 11, 2012 #10
    crutschow

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    I believe the CD4000 and 74C00 series are the only CMOS logic families that can work at up to 15V.
     
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  11. Feb 11, 2012 #11
    Wendy

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    Actually some of the CMOS family can to to 20V, especially the 4500 series.
     
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  12. Feb 11, 2012 #12
    MrChips

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    Congratulations R!f@@. You are now the 10th member of the prestigious group who have posted 5K or more and fewer than 10K posts.
     
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  13. Feb 11, 2012 #13
    R!f@@

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    HUH !! Caramba...:D

    I passed 5000.

    Beware guys. :D
     
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