"Jellybean" low voltage op-amp - Page 1
Forum section: electronics / projects

author: mcovington
author_rank: Regular Contributor
timestamp: June 04, 2024, 01:43:01 pm
content: In this day and age, what's a good default choice for a general-purpose low-voltage (5-volt) op-amp? MCP6271? Something else? DIP package is needed for breadboarding. Is there an inexpensive one that is RRIO and will run on 5 volts but will also take supply voltages up to about 15?The exact use is not yet foreseen... this is for general use, to have on hand.There are strong traditions of using chips designed 50 years ago... that's what I want to get away from, unless the ancient chips are really good.

author: tggzzz
author_rank: Super Contributor
timestamp: June 04, 2024, 02:07:11 pm
content: Quote from: mcovington on June 04, 2024, 01:43:01 pmFor such questions - and many like them - have a look at the tables in TAoE and TAoE x-Chapters. They will help you match components to your project's requirements.Start here...https://www.eevblog.com/forum/chat/the-art-of-electronics-x-chapters/msg2528661/#msg2528661

author: shapirus
author_rank: Super Contributor
timestamp: June 04, 2024, 02:14:39 pm
content: Something like MCP601 (.../2/3/4)?...except that it won't work up to 15 volts and it's only RRO. I've missed those.From my limited experience, RRIO and up to 15 volts supply and jellybean rarely, if ever, come together.

author: David Hess
author_rank: Super Contributor
timestamp: June 04, 2024, 02:46:19 pm
content: Only the major analog suppliers like Texas Instruments have 16 volt processes.For single/dual DIP parts, the only general purpose 16 volt TI chip with a rail-to-rail input is the TLV2371/TLV2372, and it is not a bad choice. Note that the absolute maximum supply voltage is 16.5 volts, and THEY ARE NOT KIDDING! This part should really be limited to 15 volts, and even minor excursions above this are likely to damage it.The TLV2401/TLV2402 is the slow micropower version of the same parts.

author: Kleinstein
author_rank: Super Contributor
timestamp: June 04, 2024, 03:01:22 pm
content: Wanting a DIP package can limit the choices quite a bit. The TS912 is a type on my list.Otherwise use the search function of the supplier: DIP8 and RR will not show that many hits.If SMD and a adaper PCB is OK there are OPA990/991/992 as RR parts that can handle 2.7 to 40 V supply.AFAIK microchip does not have many parts for more than 12 V. If really needed the MCP6V51 even goes to 45 V supply, but it is an auto zero type and SMD only.

author: shapirus
author_rank: Super Contributor
timestamp: June 04, 2024, 03:03:04 pm
content: Quote from: David Hess on June 04, 2024, 02:46:19 pmIndeed. Added some to my shopping cartThis looks like "a better LM358".

author: David Hess
author_rank: Super Contributor
timestamp: June 04, 2024, 04:00:21 pm
content: Quote from: shapirus on June 04, 2024, 03:03:04 pmTI has other parts which are better LM358s. Once you discard the rail-to-rail input requirement, then there are lots of options and modern parts which operate to 36 volts, but have a rail-to-rail output.If cost has no limit, then Analog Devices has high performance devices.As Kleinstein points out, the DIP package requirement really limits you. Accepting SO-8 parts with a cheap SO-8 to DIP-8 adapter opens up a lot more possibilities, some of which are likely less expensive.

author: ch_scr
author_rank: Frequent Contributor
timestamp: June 04, 2024, 05:56:46 pm
content: Well, for a better LM358 and 5V, there isLMV358A. Needs SOIC-2-DIL adapter, though...

author: Conrad Hoffman
author_rank: Super Contributor
timestamp: June 04, 2024, 08:31:19 pm
content: AFAICT nothing new is available in PDIP. The old standbys like TL061, 062 and such are still listed as active and still listed for PDIP. They may be 46 years old, but if you want PDIP, you'll have to go that way or use adapter boards for SMT stuff.

author: David Hess
author_rank: Super Contributor
timestamp: June 04, 2024, 08:55:29 pm
content: My list of operational amplifiers includes a couple of *inexpensive* high voltage CMOS rail-to-rail input parts:OPA196 $13.50/10 40V 2.5MHz SO-8OPA197 $14.70/10 40V 10MHz SO-8OPA991 $12.20/10 42V 4.5MHz SOT-23My only complaint about them is that they have high low frequency noise. The above are the lowest noise ones, but there are some others in the same families which are slower and lower power or faster and higher power.Here are the SO-8 to DIP adapter and the pins for it that I am using for SO-8 parts. There is a similar one for SOT-23 parts:https://www.mouser.com/ProductDetail/474-BOB-13655https://www.mouser.com/ProductDetail/575-643506If you are so inclined, there is also an inexpensive chopper-stabilized part with rail-to-rail inputs, but it is a lower power slower part with an odd maximum supply voltage of 26 volts:OPA186 $12.00/10 26V 0.75MHz SO-8I do not really know how noisy these parts are without testing because I do not completely trust the Texas Instruments specifications.

author: exe
author_rank: Unknown
timestamp: June 05, 2024, 08:09:24 am
content: Quote from: David Hess on June 04, 2024, 08:55:29 pmCould you please share the whole list of opamps, please?)I could share mine too (lt1468, opa828, etc), but I'm not that opamp-savvy...

author: David Hess
author_rank: Super Contributor
timestamp: June 05, 2024, 11:18:14 am
content: Quote from: exe on June 05, 2024, 08:09:24 amIt is an ongoing project to find a set of modern parts to stock which started with a search for an operational amplifier to repair my Tektronix DM501A multimeter. It is not well organized yet but all are welcome to peruse it.