I just did a Google search and got this TI page:berkeman said:Welcome to PF, John.
That's a strange photo. Did you add the orange lettering to enhance the photo to make it more readable? If not, it looks like the component has been "black topped" and re-labeled (note how the pin-1 mark misregisters between the orange marking and the injection molded mark).
What year is this PCBA probably from? Paging @davenn and @Baluncore for their expertise...
Now, I know that's wrong!berkeman said:
Yes. This is likely the correct approach.Baluncore said:
Nope. We're looking for something in a DIP-8, this has way too many pins. It's likely too new also (2016).dlgoff said:
Dang, You're right. Sorry about that. So the one @hutchphd posted in post #6 above is the right one?DaveE said:
Well, I wouldn't assume that. But if you put a gun to my head and no time to research, that would be my guess. I'd sketch out the circuit it's in first and try to guess the application/function. For example, is it one amp or two, etc. ?dlgoff said:
The 318 would have had LM in front of it's number if it was the fast bipolar amp. LM stands for Linear Monolithic.Averagesupernova said:
Do we even know it's an opamp...Baluncore said:
The layout of tracks on the component side of the PCB are the standard op-amp supply lines. That was an optimal manual routing technique that held power on the component side, signals on the solder side, and used components or wire links to cross tracks.Averagesupernova said:
You mean PF helps those who help themselves? I think I'm done.berkeman said:Given the high level of participation in this thread by the OP @JohnNNN that may be hard for us to get...
An opamp, short for operational amplifier, is an electronic component used to amplify and process signals in various circuits. It is commonly used in analog circuits to perform mathematical operations such as addition, subtraction, and integration.
To identify an old opamp, you can look for the manufacturer's logo, part number, and date code on the component. You can also refer to the datasheet or use a multimeter to test the functionality of the opamp.
The most common types of opamps used in old circuits are the 741, 358, and 4558. These are all bipolar junction transistor (BJT) opamps and were widely used in the 1970s and 1980s.
In most cases, yes, you can replace an old opamp with a modern one as long as the specifications and pinout are the same. However, it is important to note that some old opamps may have unique characteristics that cannot be replicated by modern opamps.
Yes, it is important to handle old opamps with caution as they may contain hazardous materials such as lead and mercury. It is recommended to wear gloves and avoid inhaling any dust or particles from the opamp. Proper disposal of old opamps is also important to prevent environmental contamination.