I’m working on the TL074 Curve Tracer project and I’m looking for the exact (correct) part number for the TL074 used in the final version of that particular project. Does anyone happen to know what the correct part number is? The ones that I’m finding form DigiKey are not matching the pineout on the schematic nor the PCB.
This may not be what you want to hear, but I used an LF347N for the quad and an LF353P for the dual. They worked very well. Looking at Digikey it looks to me like either TL047IN or TL074BCN would be suitable. The pinout for the DIP package is on page 10 of the spec sheet and matches the schematic for the curve tracer. Hope this helps.
As far as know, all the TL047 ICs with the same package used in the project (DIP 14 package) have the same pinouts regardless of where you buy them from or what manufacturer that is ( see the DataSheet documentation) and as for this project, any TL074 should and would work. Just make sure you purchase a genuine part and not a cheap and fake Chinese knock-off.I’m working on the TL074 Curve Tracer project and I’m looking for the exact (correct) part number for the TL074 used in the final version of that particular project. Does anyone happen to know what the correct part number is? The ones that I’m finding form DigiKey are not matching the pineout on the schematic nor the PCB.
Thanks for the replies.
I did purchase the correct IC it looks like. However, which pin is considered pin one since the “dot” is directly in the middle? On the TL072 the dot is more to one side making it obvious.
The data sheet indicates that the dot should be to one side.
Here’s a photo from mouser:
The dot is usually on one side but mostly applies to chips that are SMD versions. The thru-hole versions like yours (usually) have the dotted cut-out in the middle. As for which is pin 1, as the rule of thumb pin 1 is to the right of that dotted marking. In other words, consider a “bird’s eye view” in which you look down at the cip, and the dotted end of the cip is nearer to your body. Er, but this is very basic. If you simply search TL074 Pinout there are lots of heats showing you pictures of the pinout and it should also be shown in the technical datasheet document. It is very simple, not hard at all, with a little practice you’ll get used to it.
Thanks for the tip!
I did do a search for TL074 pinout, but there was quite a number of variations from what I saw.
The data sheet (page 10) indicates that the dot should be on one side – so even that is ambiguous in this case.
@ovi4 I appreciate your patience in assisting me with this as I’m quite new to IC’s!
Well, it seems you were looking at the datasheet but on the wrong page. Now let me explain: if you say you’re looking at the datasheet made by TI (Texas Instruments) the one with 84 pages, on page 10, the picture (you’ve looked at) only applies to SMD packages IE: “SOIC” style, etc. The picture has a label (below it) that talks about the package types it applies to. Now further on, if you have a good look at page 73, there is a picture of a package that is of a “DIP” style (thru-hole) package, and that (is what you want!). That is the only picture that applies to your purchased cip and clearly shows the dotted cut-out in the middle. Now, I know that DataSheets are sometimes deceiving and look complicated and intimidating with way too many pages but…. unfortunately one has to flick through every single page to find the needed information. There are “no two ways” about it.
@bh2024el no worries, we can always learn from each other. I’m still a learner too after…er… god knows how many years of tinkering with electronics…now… 🤡
@ovi4 Good point, I thought he was worried about the pinout not matching the schematic. Page 10 shows the pinout for SMD and DIP packages. And the pinout does match the schematic. As for the dot on pin1, sometimes a DIP comes that way, sometimes it doesn’t. The last time I got one particular SMD package (the switch in the ultra-probe amp CD74HC4066), I could only tell what pin 1 was by the bevel on the side of the IC. Thank the good lord, the DIP packages are more obvious.
Oh, yes I just forgot to mention it on the above posts. Yes, there is (sometimes) that bevel on the SMD package instead of a dot and some manufacturers make such a small bewell, that one needs a magnifier to see it. Oh. terrible really.
@leonard-peters It was confusing at first because some diagrams had the full round dot on the other end… and some images had it on the other end! And yes, now that I’ve seen the correct page in the datasheet – the schematic does match. But at least I was able to learn something!
I was able to confirm from Paul that the chip he used was the TL074CN. However, according to the “All Pinout” website the specs match between the TL074IN and the TL074CN.
https://www.allpinout.com/parts/10861/TI/TL074CN.html
https://www.allpinout.com/parts/10877/TI/TL074IN.html
Thread marked as “Solved”
@bh2024el I think you will love that curve tracer. I have really found it to be handy. Particularly on Zener diodes and analog chip comparisons. Neat tool. I hope yours works out great for you. Have fun with the build, I know I did.