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Date: Fri, 23 Oct 2015 09:02:14 +0200
From: "Gabriel Paubert (paubert AT iram DOT es) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To: "Evan Foss (evanfoss AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Subject: Re: [geda-user] The Chippocolypse is coming!
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On Thu, Oct 22, 2015 at 03:20:42PM -0400, Evan Foss (evanfoss AT gmail DOT com) [via geda-user AT delorie DOT com] wrote:
> On Sat, Oct 17, 2015 at 1:17 AM, al davis (ad252 AT freeelectron DOT net)
> [via geda-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote:
> > On Monday 12 October 2015, Bob Paddock
> > (graceindustries AT gmail DOT com) [via geda-user AT delorie DOT com] wrote:
> >> Looks mostly like Audio and Audio Op-Amps, among some Line
> >> Drivers and even a COP8micro (People really used those?)
> >>
> >> That Corp makes studio grade parts:
> >>
> >> http://www.thatcorp.com/
> >
> > "That" is great if "that" makes what you need, but it's all
> > special stuff.  What happens when "that" is EOL?
> >
> > The big loss here is a high performance op-amp.  I use the
> > LM4562 in some designs.  Can anyone recommend a truly comparable
> > dual op-amp?  2.7 nv/rtHz noise, 45 mHz GBP, 20 v/us slew rate,
> > drives 600 ohms.  I can find alternatives that might meet any
> > one of those, but all???
> >
> > At least when the 4562 is no longer available, since it is an
> > op-amp with standard pinout, something else will work with only
> > a minor performance hit.  The "minor performance hit"
> > alternatives are mostly cheaper.
> 
> That is not too different from the LME49720 which *might* still be out
> there in the TO-99 package. For some reason the TO-99 packaged
> versions of the LME amplifiers are not being killed off.

Surprising, since most manufacturers have obsoleted everything in TO-99
package, with very few exceptions. 

For example, and as far as I can tell, Linear Technology has eliminated 
all TO-99 versions except the LTZ1000A, where the metal can is superior
for reasons related to thermal insulation and mechanical stress on the die.

    Gabriel