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Re: TI Parts Going End of Life
Posted: Fri Sep 16, 2016 5:51 am
by mediatechnology
Looks like TI had a change of heart and moved the LM4562, LME49710 and LME49720 back into production on an 8 inch line.
TI Reinstates the LME4562, LME4971, LME49720.
Source:
http://media.digikey.com/pdf/PCNs/Texas ... 04003A.pdf
I checked a few days ago and Mouser have them in stock again.
Lets hope they got the burst noise problem under control.
Re: TI Parts Going End of Life
Posted: Fri Sep 16, 2016 4:48 pm
by ricardo
mediatechnology wrote:Looks like TI had a change of heart and moved the LM4562, LME49710 and LME49720 back into production on an 8 inch line.
....
Lets hope they got the burst noise problem under control.
I wonder if the original NS made parts had the burst noise.
In da old days, it was very dependent on the
exact process & factory ... basically sh*t in the chip.
Re: TI Parts Going End of Life
Posted: Sat Sep 17, 2016 9:32 am
by JR.
In general I would expect modern processes to be quieter with less impurities in the silicon. As they keep shrinking geometry the impurities can cause more damage to smaller features. Of course they can always use cheaper grades of raw silicon.
The proof is in the pudding (bench tests).
It's been so long since I messed with op amps that we've seen high performance op amps come and go, without my ever using them...
JR
Re: TI Parts Going End of Life
Posted: Sat Sep 17, 2016 3:11 pm
by mediatechnology
Gold is sometimes one of the contaminates that causes noisy transistors.
I read an article once where a manufacturer kept seeing contamination after repeated cleaning.
Turned out to be a quartz tube reused from a logic line.
I have to wonder if on older lines, in order to keep them running, if they re-used equipment that once processed gold-doped logic.
That 6" line is the one that was shut down.
TI admits they don't test for burst noise because the test time is too long.
I can only hope that parts made on the newer 8" line are quiet.
Other bipolar TI part numbers (OPA1612) are quiet.
The LM833 also returned as well as the LM386.
Re: TI Parts Going End of Life
Posted: Tue Jan 23, 2018 9:12 am
by vintagedesign
Looks like the LM3914N-1 has reached it's end of life as well.
The PLCC20 version is more expensive
Re: TI Parts Going End of Life
Posted: Tue Jan 23, 2018 9:40 am
by JR.
mediatechnology wrote: ↑Sat Sep 17, 2016 3:11 pm
Gold is sometimes one of the contaminates that causes noisy transistors.
I read an article once where a manufacturer kept seeing contamination after repeated cleaning.
Turned out to be a quartz tube reused from a logic line.
I have to wonder if on older lines, in order to keep them running, if they re-used equipment that once processed gold-doped logic.
That 6" line is the one that was shut down.
TI admits they don't test for burst noise because the test time is too long.
I can only hope that parts made on the newer 8" line are quiet.
Other bipolar TI part numbers (OPA1612) are quiet.
The LM833 also returned as well as the LM386.
I once gonged a Motorola 3 terminal regulator from being bought by Peavey because of noise. Motorola refused to guarantee or even spac a noise floor... see ya.
JR
Re: TI Parts Going End of Life
Posted: Tue Jan 23, 2018 9:41 am
by mediatechnology
I hope someone like JRC, CoolAudio or Xvive pickup the LM3914N.
And it looks like LME49720s on 8" still have a lot-dependent noise problem. It's causing Vicktor lots of problems in his oscillator. He's seeing up to 50% rejects.
Re: TI Parts Going End of Life
Posted: Tue Jan 23, 2018 10:01 am
by JR.
mediatechnology wrote: ↑Tue Jan 23, 2018 9:41 am
I hope someone like JRC, CoolAudio or Xvive pickup the LM3914N.
And it looks like LME49720s on 8" still have a lot-dependent noise problem. It's causing Vicktor lots of problems in his oscillator. He's seeing up to 50% rejects.
I expect the 391x to remain because it is used so widely still for DIY generic meters. However manufacturers of SKUs with even modest digital content can get meters almost free.... The ubiquitous 391x will likely be replaced by modern serial input latch (led) drivers for large scale production.
The 391x is a mature design so could probably benefit from a die shrink/redesign to reduce fab cost, just unclear that the investment is justified. I wouldn't be surprise to see the old masks reappear in China (if not there already).
JR
Re: TI Parts Going End of Life
Posted: Tue Jan 23, 2018 10:17 am
by mediatechnology
The fact that the LM3914 will remain in SMT seems to suggest that there's volume (or one big customer) outside of DIY.
Re: TI Parts Going End of Life
Posted: Tue Jan 23, 2018 10:39 am
by JR.
I didn't know there was a SMD version. They might have already done a die shrink...
I suspect there will be legs from old thru hole designs that get repackaged as SMD to reduce manufacturing cost. When I managed an engineering group there was always pressure from management to recycle old design blocks.
JR