Where can I buy BF422, BF423

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AMV8

Member
2005-01-06 12:23 pm
near london
  • #1
    Hi
    Where can I buy BF422 BF423?

    I am trying to buy BF422 but Mouser just stopped selling them. They used to be 200 for £20. However they are no longer available at Mouser and they do not plan to restock. BF423 are also getting scarce.

    The specs for BF422/423 are;
    Vdc 250
    Ima 50
    mW 600/800
    MHz 60
    gain 50
    Cpf 2.8/1.6

    BF421/423 are the same except 300Vdc however these have not been around for some time.
    Don
     
    A

    AMV8

    Member
    2005-01-06 12:23 pm
    near london
  • #4
    Hi
    Thanks for the replies

    Mjselan Thanks; these look nice parts, however I am hoping to find some semiconductors with a lower capacitance. In the BF422 and BF423 the capacitance is 1.6 / 2.6 pf as against 7pf in most of the possible replacements I have seen todate.

    Katie and dad Yes both of these sources do sell the parts. However the price at other companies has always been around £0.07 per part as against £1.25 and £0.25 at the companies you mention. Those sounces are OK if you only want 1 or 2 for replacements but the prices are not realistic for orders of more than 1 or 2.

    Don
     
    dchisholm

    dchisholm

    Member
    2011-03-29 4:48 am
    St Louis, Mo
  • #7
    Do you really need the 250V breakdown?

    The KSA916/KSC2316 may be suitable substitutes.

    Be careful when comparing capacitance specs from Data Sheets. The values vary over a WIDE range depending on test conditions (i.e., the amount of reverse bias on the PN junction). A manufacturer who publishes a spec based on a modest reverse bias of 5 or 10 volts may show a worse value than a manufacturer who measures with 50 or 100 volts - even though the "worse" part is actually faster!

    Dale
     
    A

    AMV8

    Member
    2005-01-06 12:23 pm
    near london
  • #9
    Thanks for thr replies. I did manage to find some BF422 from Toshiba but I believe I may have got the last ones around.

    Ketje
    Thanks for your suggestions. I tried the company you suggested. He had just sold out the week before and his friends had also sold out the week before.

    D Chisholm
    You may well be correct that the capacitance figures are not what they seem with some transistors. However I always try to buy transistors with the most linear transfer curves and lowest capacitance. The audio equipment I have built seems better when I stick to that position - and some makers do claim that their parts were designed to have low capacitance.

    linuxguru
    Thanks for your help although I do have all the parts I need now.

    Thanks for thr help
    Don
     
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