LM393 Differences

[Hayden]

I need to replace a surface mount ic in my amp and the markings are LM393 which the data sheet says it’s a dual differential comparator.
now it seems like there are a ton of difference ones LM393, LM393DR, LM393D, LM393P, LM393N……etc the ic just says a LM393 Is there any difference?
Cheers

 

[wg_ski]

The suffix usually refers to package type or sometimes temperature range. If it just says 393 and it’s in a DIP8 it’s either an N or a P depending on who made it.

 

[JonSnell Electronic]

Comparators RS Components

 

[abraxalito]

As you want a SMT package then LM393D is the one for you. The letter after the package (D for SO8) normally says something about the external packaging.

 

[Hayden]

Thankyou so much for your super quick replies!!😀 this is the chip U13 if that’s any help?
I'm assuming it's the same as the U24 chip up top???

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[nigelwright7557]

I need to replace a surface mount ic in my amp and the markings are LM393 which the data sheet says it’s a dual differential comparator.
now it seems like there are a ton of difference ones LM393, LM393DR, LM393D, LM393P, LM393N……etc the ic just says a LM393 Is there any difference?
Cheers

I designed a USB based LC meter and used a LM393 for the oscillator.
I found some versions worked better than others. There are numerous manufacturers of this device.
Some had glitches on the edges which really messed up measuring the frequency using a microcontroller. I tried changing hysteresis and "speed up" cap but that didnt fix it.

 

[Hayden]

Thanks guys, really appreciate it 🙂
I found this one that's in stock, I can't see any difference apart from the M which if it's .1 of a millimetre different than I can deal with that as long as internally it's the same.
LM393M/NOPB | LM393M/NOPB Texas Instruments, Dual Comparator, Open Collector O/P, 1.3μs 3 → 28 V 8-Pin SOIC | RS Components

 

[Hayden]

Wow the more I look the more that I find.
So many different suffix with slightly different specifications. I researched the suffix and I get various answers.
I still can’t find a straight LM393 like in the photo I pasted on the screenshot
(That’s the original that’s faulty) The screenshot is like only half of the ones I have access too haha

@abraxalito should I pick the LM393D like you said?

Cheers

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[abraxalito]

Either the -D or -M would be fine, they're both SOiC8.

 

[Vovk Z]

First one has MSOP case. All others - SOIC.

 

[Hayden]

Thanks guys so much!!😀
I ended up finding a chip on one of these…. It should work!!
Ordering stuff online here is so slow…weeks and weeks because of this pandemic so I will use this one with fingers crossed😱