Can you heatsink a transistor without a exposed collector? - Page 2 - diyAudio
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Old 26th January 2013, 10:27 PM   #11
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Old 26th January 2013, 11:12 PM   #12
CBS240 is offline CBS240  United States
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The TO-126 with the metal backing are generally intended for medium power amplifiers and the ones without are generally intended for small signal or driver applications. The epoxy does conduct heat quite well but still has a higher Rth than the metal tab. The larger package allows for larger surface area and thus faster heat transfer than a TO-92 or TO-92(L). Another option is TO-237, or TO-92 with the collector of the die mounted to a small metal tab that sticks out of the top of the package.
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Old 26th January 2013, 11:13 PM   #13
JMFahey is online now JMFahey  Argentina
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Raw metal is *always* better than epoxy or any other plastic, even if you have to use greased mica or silpads.
Now, if you don't push the chip to the limit, plastic is acceptable and sure saves on mounting time and complexity.
Specially in automated or non skilled labor assembly.
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Old 27th January 2013, 06:59 AM   #14
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Default Yes, you can heatsink them.

If not they would not manufacture because they are not retarded.

Not that good alike exposed metal, but you have a reasonable heat transference.

People is not stupid, no one born stupid...if they did that way, is because was tested that way, and passed their test and heatsinking was obviously considered and studied... they do not want to fail or to close their business.

Carlos
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