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<DIV dir=ltr align=left><SPAN class=376030420-19052021>When DIP dies, I stop
doing electronics. I hate hand-soldering SMD -- it's not fun. In
fact, it's insulting, because I'm not a robot and I resent being taken as
one.</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=376030420-19052021></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=376030420-19052021>But, seriously, I haven't
used an LM13700 for 10 years or more, so I'm not really too upset about that
one.</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=376030420-19052021></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=376030420-19052021>Finally, why was the way
email addresses are handled changed in this forum? I used to be able to
just click "Reply All" and it would go to the whole list. Not
anymore. Now I have to find the list name in my address book and add it
manually. Please change it back.</SPAN></DIV><BR>
<DIV dir=ltr lang=en-us class=OutlookMessageHeader align=left>
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<FONT size=2 face=Tahoma><B>From:</B> Synth-diy
[mailto:synth-diy-bounces@synth-diy.org] <B>On Behalf Of </B>Pete Hartman via
Synth-diy<BR><B>Sent:</B> Wednesday, May 19, 2021 7:11 AM<BR><B>To:</B>
chris<BR><B>Cc:</B> synth-diy@synth-diy.org<BR><B>Subject:</B> Re: [sdiy] DIP
LM13700 discontinuation<BR></FONT><BR></DIV>
<DIV></DIV>
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<DIV><BR></DIV>
<DIV dir=auto>Repairs.</DIV>
<DIV dir=auto><BR></DIV>
<DIV dir=auto>Existing established designs. It's not trivial to "port" to
smd the right way, i.e. not just dumping into the new format without testing to
ensure it's still good (yes usually it will be, but it still has to go through
the process).</DIV>
<DIV dir=auto><BR></DIV>
<DIV dir=auto>As already pointed out, breadboard work.</DIV>
<DIV dir=auto><BR></DIV>
<DIV dir=auto>Nothing dogmatic about simply noting the continued fading of
through hole either.</DIV>
<DIV dir=auto><BR></DIV>
<DIV dir=auto>The skill of soldering smd well is *different* from soldering
through hole well. Easier or not this is still a concern to a lot of
people who don't have that experience with smd.</DIV>
<DIV dir=auto><BR></DIV>
<DIV dir=auto>Pete</DIV>
<DIV dir=auto><BR></DIV>
<DIV dir=auto><BR></DIV>
<DIV dir=auto><BR></DIV>
<DIV dir=auto><BR></DIV>
<DIV dir=auto><BR>
<DIV dir=auto class=gmail_quote>
<DIV dir=ltr class=gmail_attr>On Wed, May 19, 2021 at 8:46 AM chris <<A
href="mailto:chris@chrismusic.de">chris@chrismusic.de</A>> wrote:<BR></DIV>
<BLOCKQUOTE
style="BORDER-LEFT: rgb(204,204,204) 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex"
class=gmail_quote>Hmm, I don't understand why people are dogmatically sticking
to DIP.<BR><BR>Soldering SO is a piece of cake. Even my 60+ years old eyes and
fingers<BR>have no problems with SO. It's not as if it were 0.4mm pitch or
BGA.<BR><BR>Or is it the old wives' tale that the holes make it sound better?
<BR>Like f holes on a violin...?<BR><BR>Chris<BR><BR><BR><BR>On Wed, 19 May
2021 08:06:59 -0400 (EDT) <A href="mailto:mskala@ansuz.sooke.bc.ca"
target=_blank>mskala@ansuz.sooke.bc.ca</A> wrote:<BR><BR>> It seems Texas
Instruments is discontinuing the LM13700N - that is the DIP<BR>> version of
the part. Mouser lists it as "End of Life" and links to this<BR>>
discontinuation notice dated May 12, 2021, with the last order date
May<BR>> 12, 2022:<BR>> <A
href="https://www.mouser.com/PCN/Texas_Instruments_PCN20210505000_2021051212340278.pdf"
rel=noreferrer
target=_blank>https://www.mouser.com/PCN/Texas_Instruments_PCN20210505000_2021051212340278.pdf</A><BR>>
<BR>> I haven't been able to find this notice on the TI Web site, which
still<BR>> shows the product's status as "active," including the DIP
version.<BR>> <BR>> CoolAudio makes a 13700 clone and their data sheet
describes both DIP and<BR>> SOIC versions, but the DIP seems to be a
unicorn. CoolAudio doesn't sell<BR>> it on their Web site, neither do
any distributors, and a Web search for<BR>> the purported part number of
V13700D only turns up the data sheet. I<BR>> don't believe it really
exists in any way accessible to hobbyists. Maybe<BR>> they'd make it
for you if you ordered a million units.<BR>> <BR>> A Chinese
manufacturer called "XinLuDa" offers a DIP dual operational<BR>>
transconductance amplifier called the XD13700, available through LCSC,<BR>>
which seems to be a clone; I don't know how faithful it is or isn't.
They<BR>> do note in their data sheet that there are differences in the
buffer units<BR>> between the XD13700 and XL13700 (which is their own
surface-mount version<BR>> of a similar part). Interestingly, they
claim that the DIP version is<BR>> better - in which case why make them
different at all?<BR>> <BR>> Alfa offers a 3280 clone (data sheet says
both DIP and SOIC, but the Web<BR>> site only lists the SOIC); and
something called the AS13704, which is a<BR>> 13700-like OTA in a quad
instead of dual configuration, and only in SOIC.<BR>> Neither can directly
replace a DIP 13700.<BR>> <BR>> I think the 13700 may be a bellwether
for through-hole packages in<BR>> general. As basically the last OTA
to be available in a through-hole<BR>> version from a major manufacturer,
it has a big share of the market for<BR>> through-hole analog
electronics. If it makes sense to discontinue this<BR>> product, that
means the market in question is now too small to be worth<BR>> serving
anymore, and that assessment will be applied to other products<BR>>
too. Memento mori.<BR>> <BR>> -- <BR>> Matthew Skala<BR>> <A
href="mailto:mskala@ansuz.sooke.bc.ca"
target=_blank>mskala@ansuz.sooke.bc.ca</A>
People before tribes.<BR>> <A
href="https://ansuz.sooke.bc.ca/" rel=noreferrer
target=_blank>https://ansuz.sooke.bc.ca/</A><BR>>
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