Help identify component

Discussion in 'General Electronics Chat' started by Robin Mitchell, May 28, 2011.

  1. Robin Mitchell

    Thread Starter Well-Known Member

    Oct 25, 2009
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    Hi everyone,

    Got a load of electronics from my school and i noticed this bag which says Toxic, Berylium oxide. The components appear to be smd, they have four legs coming out (looks like a cross hair). What is it???

    Thanks
     
  2. Kermit2

    AAC Fanatic!

    Feb 5, 2010
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    BELIEVE the warning. IT IS TOXIC. It has a very high thermal conductivity, can be used in nuclear reactor devices, microwave tubes, Gas laser Tubes, and is an ingredient in special ceramic compounds.

    It causes heart problems when inhaled and is a human carcinogen!

    Best thing for you to do is take it to a fire department and ask them to dispose of it for you, or tell you where such things can be taken for disposal.
     
  3. #12

    Expert

    Nov 30, 2010
    16,269
    6,781
    I remember seeing this warning on rectifiers in the '70's. The nasty gets out if you fracture the ceramic. Just for giggles, try NOT fracturing the ceramic parts.
     
  4. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    Can you post a picture of the part?
    In the older parts BeriliumOxide is used to transfer the heat, as it conducts the heat very well.
    The BeriliumOxide is VERY toxic, a couple of micrograms can cause a lung desease, a larger amount can kill you.

    http://en.wikipedia.org/wiki/Beryllium_oxide
    Beryllium Oxide MSDS

    Bertus
     
  5. KJ6EAD

    Senior Member

    Apr 30, 2011
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    It's probably a really good RF transistor, maybe even radiation hardened. If you really want to identify it, post a good photo. In your device, the beryllium oxide is probably being used as an intermediate substrate between the die and lead frame to reduce the thermal resistance of the package. As long as you don't grind it to dust or soak it in a strong acid, you should be safe.
     
  6. Robin Mitchell

    Thread Starter Well-Known Member

    Oct 25, 2009
    732
    199
    im keeping the **** away from it and there for shall not post a picture, i have hear enough!
    (oh, i took two toxic stickers off the packet and stuck them on my workshop door :D)

    Thank you SO MUCH for the warning guys :)
    Plus very soon i shall take photos of my workshop :D!
     
  7. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    Do they look like the transistors in the picture below?

    [​IMG]

    Those are quite expensive RF transistors.
    As long you do not break or heavely scratch them you are safe.

    Bertus
     
    Last edited: May 29, 2011
  8. Robin Mitchell

    Thread Starter Well-Known Member

    Oct 25, 2009
    732
    199
    Last edited: May 29, 2011
  9. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    The screw on the backside is to mount the transistor on a heatsink.
    The screw goes THROUGH the PCB and the tabs are soldered.

    I have two pictures of a mounted RF transistor:

    one with the soldered transistor:

    [​IMG]

    and one with the screw mounted to a heatsink (this is a small one that is mounted to a larger one in the cabinet):

    [​IMG]

    Bertus
     
  10. Robin Mitchell

    Thread Starter Well-Known Member

    Oct 25, 2009
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    199
    thanks bertus :D!!!
     
  11. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    Can you read the partnumbers of those transistors?
    I might be able to find the specifications.

    Bertus
     
  12. Robin Mitchell

    Thread Starter Well-Known Member

    Oct 25, 2009
    732
    199
    Sorry bertus but im throwing them away. I dont want anything to do with carcogenics
     
  13. KJ6EAD

    Senior Member

    Apr 30, 2011
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    Better throw away your microwave oven and cell phone while you're at it, and everything you own that's not made of wood. :rolleyes:

    Come to think of it, some woods may be carcinogenic, mutagenic and/or teratogenic. :(
     
  14. Wendy

    Moderator

    Mar 24, 2008
    20,765
    2,536
    Beryllium Oxide really is a category unto itself. It isn't just a little toxic, it is extremely toxic. This isn't wood. While in solid form it is safe, but don't every turn it to dust. I would give it to an electronics or HAM myself, if you don't then don't let it fall into the city dump. It is a useful part as is.
     
  15. Robin Mitchell

    Thread Starter Well-Known Member

    Oct 25, 2009
    732
    199
    oh ok then, who wants it?
    You will have to pay p&p + £5

    Fair deal?

    (i think i have loads of other RF transistors)
     
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