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Chip Amps Amplifiers based on integrated circuits

LM4780
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Old 21st May 2019, 03:11 PM   #1
AndroidClone is offline AndroidClone
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Default LM4780

Help! I bought some fake lm4780 chips on aliexpress since I cannot find a US supplier. Can someone help me source a chip? I broke the IC on my hybrid amplifier (8 years of service) and cannot find a replacement.
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Old 21st May 2019, 07:31 PM   #2
MINUX75 is offline MINUX75  France
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mount anyway the "fake" in your amplifier and try it. If it works, the job is done and your IC was not fake. There is not proof that your lm4780 chips is fake.
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Old 21st May 2019, 07:38 PM   #3
asuslover is offline asuslover  Romania
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LM4780
Post a picture of that chip plz.
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Old 21st May 2019, 08:06 PM   #4
AndroidClone is offline AndroidClone
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Quote:
Originally Posted by MINUX75 View Post
mount anyway the "fake" in your amplifier and try it. If it works, the job is done and your IC was not fake. There is not proof that your lm4780 chips is fake.
Well here's the thing, I ran a continuity check and tested -v lines as well as positive pins according to the lm4780 datasheet and it does not match at all. The first and second row pins are inverted according to the data sheet. See attached picture. Click the image to open in full size. it says it's an lm4780ta but this is definitely not it. Pin 1 and 27 share continuity which should not be the case as the last pin is a voltage line. I would have destroyed my amp if I tried to plug it in. If you look at the picture the short pins do not match.
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Old 21st May 2019, 08:14 PM   #5
AndroidClone is offline AndroidClone
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Quote:
Originally Posted by asuslover View Post
Post a picture of that chip plz.
Here's an actual picture of the fakes. Odd pins should be short pins but they are long and on the first row. Click the image to open in full size.
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Old 30th May 2019, 04:06 PM   #6
tomchr is offline tomchr  Canada
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The odd pins are the long ones. Just as the LM3886. If you post a picture of the back of the chip, we might be able to tell real from fake by the shape of the metal on the back.

Either way, you're not going to find an LM4780 at any of the distributors. It was discontinued by TI 2-3 years ago.

Tom
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Old 10th August 2019, 01:50 PM   #7
jvhb is offline jvhb  Europe
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Hi, if you are still looking for LM4780, I have some (12 actually) left over from a project. They were ordered directly from Farnell, and are still in sealed bags.

Send me a PM if you want...
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File Type: jpg LM4780TA.jpg (99.4 KB, 40 views)
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Last edited by jvhb; 10th August 2019 at 01:52 PM. Reason: Picture attached...
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