[sdiy] DIP LM13700 discontinuation

[Roman Sowa]

With special tip I'm able to desolder SOIC16 within 5 seconds or so. Not 
doable with DIP, although there are also special tips for DIP, at least 
I have seen one in the 80's.
It's hard to have every possible tip for every possible package, so hot 
air comes handy. Recently I have desoldered a few TQFP44. Took a minute 
or two, no damage to traces, which is important as and it was done 
several times on the same PCB.
I have tried also the thin stainless wire method, but it takes more 
practice and needs room around the chip to operate the wire.
At one trade show years ago I have seen a guy desoldering SOIC with 
DenOn SC7000 but I was never able to do that.

Roman

W dniu 2021-05-20 o 11:04, chris pisze:
> On Thu, 20 May 2021 10:07:19 +0200 Steve via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
>>> And at that scale, the rework is also not hard, and I think it's far
>>> easier to actually properly desolder SMT parts than through hole.
>> There it would seem that smaller parts are easier - heat it all up with
>> the hot air station (the cheap ATTEN 858D+ does it),
>> which would seem difficult with SOIC of that pin count. (OK it's also
>> not fun with e.g. UFQFPN with a nasty thermal sink in the middle)
>>
>> IIRC I never de-soldered a SOIC - how *do* you do that? Flux and wick
>> still leaves a little bit of connecting solder on many pins at the same
>> time?
>> I faintly remember once using a piece of lacquer insulated copper wire,
>> dragging it under the first heated pin in line, then the next, and so
>> forth, where the wire keeps the pins from the pads. That was not as big
>> a part, though.
> 
> Using hot air this is easier than I had expected.
> 
> I once had to desolder a finger nail sized TQFP Atmel Mega 64, and it
> was a breeze. I had suspected everything around would float away, but it
> was possible to work exactly where I wanted. Only took a couple of
> seconds.
> 
> I'd rather do that than suck-wicking a DIL-40.
> 
> Chris
> 
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