TL07x vx. TL08x… Which one?? - Page 1
Forum section: electronics / projects

author: proschuno
author_rank: Contributor
timestamp: April 12, 2014, 01:54:06 am
content: So after pouring hours upon hours over the data sheets for these two types of opamps, I can't seem to find a difference between the two. They're both Jfet input opamps that I believe were designed for audio use (they have high slew rates anyway…). Can anyone who is experienced with this chips enlighten me? I've uploaded the data sheets below:http://namselectro.free.fr/Datasheet/TL08X.pdfhttp://www.ti.com/lit/ds/symlink/tl071a.pdf

author: Lightages
author_rank: Unknown
timestamp: April 12, 2014, 03:15:15 am
content: I defy anyone to hear a difference in a properly implemented TL072, or TL084, or a LF357, or a LF356, or an NE5532/4. Just look at what you re trying to do, what load it will drive, what input load it needs to present, what bandwidth, need for lower current noise or voltage noise... etc. Without knowing your specific need or use it is impossible to tell you which is better. If you are not sure what you are going use the opamp for then it is all a pointless discussion.

author: David_AVD
author_rank: Super Contributor
timestamp: April 12, 2014, 03:48:38 am
content: The TL06x series is lower Iq and more noise, but the TL07x and TL08x do seem to have the same specs.Interestingly the TI site says:QuoteI must admit I only looked at the basic web specs, not the full data sheet for each.

author: edavid
author_rank: Super Contributor
timestamp: April 12, 2014, 04:39:59 am
content: When they first came out, the TL08x had a higher noise spec. At some point, TI revised it to be the same as the TL07x. So, buy whichever is cheaper.

author: calexanian
author_rank: Super Contributor
timestamp: April 12, 2014, 05:15:39 am
content: Just simply a spec thing. I have been told the TLO7* and TLO8* use the same dies nowadays.. Just tested for a lower noise spec of the 7*. the TLO6* series is actually very different internally according to the equivalent circuit diagram. Just plunk in the 72. Billions of them out there cant be wrong!

author: edavid
author_rank: Super Contributor
timestamp: April 12, 2014, 05:41:21 am
content: Quote from: calexanian on April 12, 2014, 05:15:39 amThis is not correct, the TL07x no longer have a lower noise spec.

author: proschuno
author_rank: Contributor
timestamp: April 12, 2014, 12:21:50 pm
content: TL07x series it is then…. These appear cheaper on places like ebay and the like, so I just wanted to see a difference before I ordered en masse.I just found it really odd that two opamp series can have exactly the same specs like that…. literally wondered the point of one family existing, know what I mean?

author: dannyf
author_rank: Super Contributor
timestamp: April 12, 2014, 12:32:39 pm
content: The TL05x/6x/7x/8x were probably different families (by yield?) then, but not now.

author: GK
author_rank: Super Contributor
timestamp: April 12, 2014, 04:19:25 pm
content: Quote from: proschuno on April 12, 2014, 12:21:50 pmTL05X had better input offset voltage & drift specs the last time I looked. They are probably all the exact same parts just sorted after manufacture into different grades. I measured a bunch of TL071's a while back and they all had quite a lot less 1/f noise than the datasheet suggested.

author: calexanian
author_rank: Super Contributor
timestamp: April 13, 2014, 06:00:26 am
content: Quote from: edavid on April 12, 2014, 05:41:21 amFantastic. I suppose if you are even considering a TLO72 noise is not really a concern. My guess is you just need a cheap fet input "Jellybean" device at that point. There are far better newer parts to chose from these days, but they are not quite as low priced.

author: proschuno
author_rank: Contributor
timestamp: April 13, 2014, 01:05:05 pm
content: In reply to calexanian:Basically … but I don't mind paying a little bit more if anything else slightly better could be recommended.