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Old 2nd September 2012, 07:11 PM   #1
johnr66 is offline johnr66  United States
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Join Date: Mar 2009
Default Fake vs. real TDA2050 die size

I bought some TDA2050s off of that auction site so I could compare to the ones I bought from DigiKey. Having several, I tested, killed and dissected a couple.

real IC: large squarish shaped die (fractured a bit in removing the cover)
Click the image to open in full size.

Fake IC: Very small die (again fractured). About 1/3rd the size of the authentic one.
Click the image to open in full size.

Tests results. The authentic IC put out 18 watts before clipping into a 4 ohm load. The fake measured 2.6 watts less using the same supply (12.6-0-12.6v 2A transformer based dual supply).

Short circuit / thermal overload. The real IC would not blow when shorting the output lead to ground, even for several seconds. The fake did not blow either. The fake TDA2040 ICs I also tested blew instantaneously upon shorting.

With a very undersized heat sink, the authentic TDA2050 would dial back output power when it got too hot. The fake seemed like it was beginning to limit and then failed with a nice bang. Too much heat in that small die?

I did not perform a listening test.
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