How can an Op-Amp of type TL072C be found if there are multiple variations?    - Page 1
Forum section: electronics / repair

author: EE_enthused
author_rank: Newbie
timestamp: August 29, 2022, 12:51:51 am
content: I am looking for a particular Op-Amp of type TL072C made by TI, but there are so many variations and the one I need does not come with any labeling to allow me to find it via Google.The top says TL072C 18K C774 G4. What does the 18K C774 designate it as?

author: manicdoc
author_rank: Unknown
timestamp: August 29, 2022, 01:43:53 am
content: Quote from: EE_enthused on August 29, 2022, 12:51:51 amWhat's it being used for in the circuit? What are the supply rails and what signals is it dealing with?

author: Hiemal
author_rank: Regular Contributor
timestamp: August 29, 2022, 04:00:30 am
content: The codes/numbers below the main part number aren't totally relevant, at all actually!Those are either date codes, manufacturing site/factory codes, or some internal use code number. Any TL072 would work!

author: bdunham7
author_rank: Super Contributor
timestamp: August 29, 2022, 04:30:54 am
content: Assuming you are looking for the ST version of an actual TL072C, I think most of the 'variations' you are seeing are the package type (PDIP-8, TSSOP, etc) and the packaging (bulk, tape, reel, etc). The markings you are seeing probably won't correlate to either of those things and will be production dates or things like that.

author: macboy
author_rank: Super Contributor
timestamp: August 29, 2022, 08:02:46 am
content: All that extra stuff doesn't matter. What does matter use the letters immediately following the part number. In this case, the version of the ubiquitous TL072 that you are looking for is TL072C. If you download the TI datasheet for TL072, and look at the Electrical Characteristics section, you will find different specifications for the different variations: TL072C, TL072AC, TL072BC, TL072M, and others. The TL072H is actually manufactured differently as it is a higher voltage device, but the other "versions" are likely all manufactured identically. The difference is in testing of the finished devices done by TI. They test various parameters like input offset voltage, and bin the devices based on how well they test. Only the better ones might meet the better specs of the TL072AC version, so they are marked as such and sold at a premium price. Others which meet the TL072BC specs are marked and sold as such. The TL072C is a lower spec part so they are sold cheaper. Any one may be just as good as any random TL072AC marked part, but maybe not; the guarantee is that it at least meets the specs in the datasheet.So if you want an "exact" replacement, buy a TI branded TL072C from a reputable source (Digikey, Mouser, etc., But not eBay, Ali, or Amazon). The AC and BC are acceptable too as they are maybe even "better". But you can't replace an (e.g.) AC part with a lower spec C part and blindly trust that it will be good enough. It will likely be fine most of the time, but not if the circuit depends on a tight spec like low input offset, and you happen to get one which falls at the bad end of that spec.

author: Zenith
author_rank: Frequent Contributor
timestamp: August 29, 2022, 12:10:12 pm
content: Quote from: EE_enthused on August 29, 2022, 12:51:51 am18K C774 could be anything such as batch code and plant code for quality control purposes. It's almost certainly irrelevant for your purposes.Looking at the ST datasheet TL072C differs from others, such as TL072M, in having slacker tolerances in some areas and a narrower operating temperature range.Unless your application has very particular requirements, such as guaranteed performance at sub zero temperatures, you will probably find any TL072 from any maker will be fine.

author: strawberry
author_rank: Super Contributor
timestamp: August 29, 2022, 04:30:00 pm
content: for consumer product it doesnt matter . generally any IC will workindustrial equipment it might matter . there are better ICs than TL072

author: tooki
author_rank: Super Contributor
timestamp: August 29, 2022, 05:10:02 pm
content: Quote from: macboy on August 29, 2022, 08:02:46 amFYI, for TI parts, there is no “etc” any more: Mouser and Digi-Key are the only distributors for most of the world. (Asia has one or two more.) TI eliminated almost all of its reseller network a few years ago. The OP is in USA, and for USA and Europe, the only authorized vendors are Mouser, Digi-Key, and TI’s own web store.