(Topic ID: 74471)

2013 has been a bad year for electronic component supplies...

By G-P-E

10 years ago


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  • 108 posts
  • 44 Pinsiders participating
  • Latest reply 56 days ago by dasvis
  • Topic is favorited by 21 Pinsiders

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    #38 9 years ago

    sigh.
    Good think I design my own boards with only SMT now.
    It is concerning that TO-92 are going obsolete. What are all these engineering students going to use for Labs? PSpice only gives you so much info.

    3 months later
    #73 9 years ago

    Sigh... what are the EE students going to do without breadboarding labs?

    5 months later
    #77 8 years ago
    Quoted from CactusJack:

    As some of you might know, the going rate (places like Mouser, Digikey, Arrow) for an LM338K (5 amp adjustable TO-3 regulator) is around $42-$50. That's each!

    Ouch! So what I'm hearing is that someone should make a 5A +5V switcher which can fit in existing TO3 case?

    3 weeks later
    #84 8 years ago
    Quoted from G-P-E:

    Latest news -- I was told *ALL* DIP style logic devices to be phased out within two years.
    On-Semi (Motorola), Philips, ST and others have already done so. TI is sole survivor ... for now.

    This doesn't really surprise me; but really... what do EE students do now in LABs? I remember using solderless breadboards and DIP packages all the time... how does the universities teach electrical engineering now?

    Very disappointing; but I'm guessing it'll take years for the current stock to disappear...and then decades for "pulls" to disappear.

    #93 8 years ago

    There's something to be said for learning with actual wires and whatnot.
    Oh well.

    2 years later
    #94 6 years ago

    My Data East Star Trek has been having some issues which I've traced down to a very low (4.4v) +5V power supply.
    I went to order some replacement parts from digikey and found that these important parts are out-of-stock as a last time buy.

    LM723C - the main +5V regulator chip
    2N6284 - the TO3 power darlington which runs the +5V regulator

    I was able to secure a UA723CDR in the 14SOIC package and
    PA0004-ND
    SOIC-14 TO DIP-14 SMT ADAPTER
    to hopefully get the PSU healthy for TPF'2018 from Digikey.
    I subbed a MJ11012G transistor for the 2N6284

    With these chips/transistors going by way of the dodo... I'm starting to get more than a little concerned at the amount of work it's going to be to keep these machines running.

    5 months later
    #98 5 years ago
    Quoted from Zitt:

    I was able to secure a UA723CDR in the 14SOIC package and
    PA0004-ND
    SOIC-14 TO DIP-14 SMT ADAPTER
    to hopefully get the PSU healthy for TPF'2018 from Digikey.
    I subbed a MJ11012G transistor for the 2N6284

    ...

    Quoted from G-P-E:

    Fortunately, there is still one alternate part number remaining for now - UA723CN.

    Yeap. Incidentally; the UA723CDR w/ SOIC-14 dip adapter worked beautify. Played another set of games on the DEST this afternoon.

    #100 5 years ago
    Quoted from G-P-E:

    Regarding the 2N6284G...

    Unsure if that was just general advice; or you were directing at me.
    At the time *I* ordered... TO3s were in very short supply at Digikey. I did the best I could with what I had available at the time of order.
    That said; I'm not 100% sure I replaced my 2N6284... It's possible just the UA723CDR was all I need to get the PSU functional.

    #105 5 years ago

    basic, original 7400 series has been eol for years. only the more modern replacements are available. IE 74HCT or similar because they are usually direct replacements.

    5 years later
    #107 3 months ago

    Just got word from Digikey that TI is discontinuing the LM339 opamps currently used in a lot of modern Williams games for the switch matrix:

    LM339 EOL 10/16/2024LM339 EOL 10/16/2024

    Last Time Buy Date: 10/16/2024
    All the listed alternates are SOIC-14 packages.

    I stand corrected. Apparently the thruhole version isn't being eoled - yet. as far as I can tell.

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