recomendations for DIP rail-to-rail OpAmp - Page 1
Forum section: electronics / beginners

author: dentaku
author_rank: Frequent Contributor
timestamp: July 20, 2015, 11:19:20 pm
content: The TLV2462cp seems like a handy utilitarian rail-to-rail OpAmp still available in a DIP packagehttp://www.ti.com/lit/ds/slos220j/slos220j.pdfAdafruit says "This is our favorite hobby op-amp, which we use in our kits"It's only rated for a maximum of 6V so I've done some searching for something similar than can be used at higher voltages like 12V or even 15V.The TS922INhttp://www.digikey.ca/product-detail/en/TS922IN/497-3049-5-ND/634813is more like what I'm looking for (for example).Can anyone recommend a similar DIP (has to be breadboardable) / rail-to-rail decently high power OpAmp I should look for? Nothing particularly fast or low power, just something you can use where you might even use a LM358 but need to get much closer to the rails.

author: Cliff Matthews
author_rank: Unknown
timestamp: July 21, 2015, 12:24:45 am
content: I can't speak from much experience but someone may (be patient). Here's a $orted Digikey search for R2R pDIP's in 8, 14 and 16 pins..http://www.digikey.ca/product-search/en?FV=fff40027%2Cfff800dd%2Ca40070%2C142c035e%2C142c0398%2C142c0442&mnonly=0&newproducts=0&ColumnSort=1000011&page=1&stock=0&pbfree=0&rohs=0&quantity=&ptm=0&fid=0&pageSize=500..just noticed we're on the same side of the border... You may want to check here if you live in horseshoe area:http://www.dipmicro.com/store/index.php?act=viewCat&catId=648

author: dadler
author_rank: Unknown
timestamp: July 21, 2015, 01:34:06 am
content: How about this? LMC6482AIhttp://www.mouser.com/ProductDetail/Texas-Instruments/LMC6482AIN-NOPB/?qs=sGAEpiMZZMtCHixnSjNA6JlKxGj6zye%252bezT2xgWd1g0%3dI have a bunch of these in SOIC-8 but they come in DIP as well.

author: ludzinc
author_rank: Unknown
timestamp: July 21, 2015, 01:47:38 am
content: I've used these before:http://www.ti.com/lit/ds/symlink/lm6132.pdfin this project:http://ludzinc.blogspot.com.au/2015/01/psu-console.htmlBonus was I got them as free samples from TI

author: Cliff Matthews
author_rank: Unknown
timestamp: July 21, 2015, 11:40:18 am
content: Quote from: blueskull on July 21, 2015, 12:40:10 amQuite true! I hadn't looked at the price of these in a while.. So yeah, .23cents each in small quantities, supply your own headers and Bob's your uncle!http://www.futurlec.com/SMD_Adapters.shtmlThey take Paypal too... I just noticed, that catchy accent from down-under is having its effect on me.. (ah, no worries mate)

author: Zero999
author_rank: Super Contributor
timestamp: July 21, 2015, 11:56:37 am
content: The TS272 is my favourite.http://www.st.com/web/en/resource/technical/document/datasheet/CD00000495.pdf

author: Cliff Matthews
author_rank: Unknown
timestamp: July 21, 2015, 01:40:40 pm
content: Quote from: Hero999 on July 21, 2015, 11:56:37 am8pin, dual, 18v, sinks 45ma, source 30ma, not bad for ~75cents..

author: dentaku
author_rank: Frequent Contributor
timestamp: July 21, 2015, 02:52:31 pm
content: That's all very interesting stuff.Maybe I should check if I can get samples of some of those.

author: fcb
author_rank: Super Contributor
timestamp: July 21, 2015, 02:56:57 pm
content: MCP6002

author: jlmoon
author_rank: Unknown
timestamp: July 21, 2015, 03:17:38 pm
content: If you have not found a part yet, take a look at ST Microelectronics TS95X family Rail to Rail BiCMOS Op Amps.

author: Rick Law
author_rank: Super Contributor
timestamp: July 21, 2015, 04:53:37 pm
content: Quote from: blueskull on July 21, 2015, 12:40:10 amI wonder if I am typical for hobbyist. For me, I would prefer dip8 directly. No sense paying extra and extra work. That extra adapter makes it more difficult to breadboard as well.As DIPs become less available, it will get more difficult for us less-advanced hobbyist. This I bet already impacted young kids wanting to play with electronics. Think about the process of just experimenting with an OpAmp adder using all SMDs. All SMDs add an order of magnitude more skill (and more work) necessary to get going. You can't even get that far until you get adequately good with soldering. How would a kid get started? Well you need to learn X, but to do so, you got to get good with Y. But before you can touch Y, you got to practice Z. And to even try Z, you got to by A,B, and C... So, he/she gets back to Angry Bird and his/her virtual world of games.

author: Zero999
author_rank: Super Contributor
timestamp: July 21, 2015, 05:02:00 pm
content: Quote from: Cliff Matthews on July 21, 2015, 01:40:40 pmIt's not rail-to-rail though - whoops.Quote from: fcb on July 21, 2015, 02:56:57 pmIt has a maximum rated voltage of 6V though.

author: Cliff Matthews
author_rank: Unknown
timestamp: July 21, 2015, 06:08:29 pm
content: Quote from: Hero999 on July 21, 2015, 05:02:00 pmThere's the TLV272 (3Mhz, dual r2r) at 77cents.. But it only kicks out 13ma.. There's the OPA2188 (costs more and no dip available)Can we win?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: July 21, 2015, 06:09:29 pm
content: TLV2372, good to 16V

author: Cliff Matthews
author_rank: Unknown
timestamp: July 21, 2015, 06:25:08 pm
content: Quote from: T3sl4co1l on July 21, 2015, 06:09:29 pmDouble the price, and kicks 15ma. Ops original LM358 preference sources 30ma but sinks 15ma. Perhaps TLV272 seems to have best bang-for-the buck and the TLV272 pinout is the same as the LM358.More chatter on this here:http://electronics.stackexchange.com/questions/156793/rail-to-rail-opamp-parameters-for-signal-conditioningOther sources (under a dollar CDN each):http://canada.newark.com/texas-instruments/tlv272ip/op-amp-3mhz-2-4v-us-dip-8/dp/76C8486?ost=TLV272ipandhttp://www.digikey.ca/product-detail/en/TLV272IPE4/TLV272IPE4-ND/1677987

author: Zero999
author_rank: Super Contributor
timestamp: July 21, 2015, 07:26:57 pm
content: Does this need to work at DC?If it only needs to work for AC, the power supply can be bootstrapped to nearly double the output voltage.http://www.valvewizard.co.uk/glassblower.htmlFor greater efficiency, R1 & R2 can be replaced with Schottky diodes.

author: poorchava
author_rank: Super Contributor
timestamp: July 21, 2015, 07:35:32 pm
content: I hardly see why people are using DIP ICs anymore, maybe except for specific situations (high impedance stuff, high voltage stuff). Anybody making their own PCBs can fabricate a sheet of several dozens of different breakout boards for all sorts of SMD chips. And soldering SMD really does not require any extraordinary skill, just bare minimum of dexterity.

author: dentaku
author_rank: Frequent Contributor
timestamp: July 21, 2015, 07:40:33 pm
content: Quote from: Cliff Matthews on July 21, 2015, 06:25:08 pmAfter looking at datasheets for all the recommended OpAmps you see the different styles of each manufacturer. Some are easier to read than others.Sometimes it's easy to see just how far an OpAmp can swing (the TLV272 datasheet is nice) and sometimes you have to go hunting through obscure stuff and not find what you're looking for if you're a beginner.I wish most parts had a section that says "this much current on one pin will eventually kill the inputs/outputs of this chip"

author: T3sl4co1l
author_rank: Super Contributor
timestamp: July 21, 2015, 10:10:25 pm
content: Sometimes they give you peculiar hints at misbehavior, like there was an earlyish MOS op-amp (I think a low-power parody of LM324 or something like that) which had a graph of something like fT vs. Vcm. What, you mean the damn thing gets faster the closer to -V I operate?! What a mess! Good luck trying to use that at elevated Vcm, let alone in circuits with wide swing (if fT is a big part of your circuit's dynamics, you might even get chaos from it!).You can almost always tell when you've got an RRIO "full complementary" type, because the Vos vs. Vcm plot has a funny step near one of the rails. That's the input stage being a pair of diff pairs, one "up", one "down", and one of them switches off near the rail, hence the shift in Vos (which is predominantly a characteristic of the input transistors). Assuming they give one of these plots, of course. TLV2372 is one of this type, of course.Tim

author: Rick Law
author_rank: Super Contributor
timestamp: July 21, 2015, 11:12:28 pm
content: Quote from: poorchava on July 21, 2015, 07:35:32 pmCase and point of my earlier post on how all-SMD increases the barrier for hobbyist. They need to learn how to make their own PCB to make a prototype, or use adapters after adapters. And to make your PCB, you need to learn how-to etch it. At the minimum, at least learn how to use yet another software package to lay it out and then send to an out-sourcer to make the PCB for you. Worst is, as beginner and hobbyist, likely the first one isn't going to work or some factors were missed - after all, it was designed by a beginner or "merely" an hobbyist. So, the circuit needs to go multiple rounds with multiple $-expense and multiple weeks delay.Whereas, with through hole components, you can get a prototyping board with pre-drilled holes and off you go.The all-SMD really makes it difficult for quick prototyping for hobbyist. For non-professional or one without professional aspiration, that added cost make it less worth doing.