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.
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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.
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?
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.
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.
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.
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.
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.
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:
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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