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Why ICs are of Black color?
Why ICs are of Black color? ok this is very common thought of a person who sees the IC for the first time. There are different reasons for this. Although there are few colored ICs are now available in market. Let us have a look to know why ICs are of black color.
Two factors can be considered as a reason: price and isolation. The black color comes from carbon-loaded epoxy or plastic. The majority of the electromagnetic spectrum, including light, is blocked by carbon. When it comes to cost, black is the cheapest color to choose if you’re creating a lot of chips. And, I believe, it is what everyone expects; a true chip must be black.
Ceramic integrated circuits are often white, grey, or a gorgeous shade of purple-grey, with gold caps on some. Some are really old, while others are military-grade processors.
Finally, while some current ICs are black, optoisolators are typically white.
The epoxy resin used to enclose the integrated circuit contains additives (fillers). The fillers are there to change the epoxy’s thermal characteristics (reduce its thermal expansion so it doesn’t break or harm the integrated circuit’s connections when temperature is changed).
The majority of integrated circuits are photosensitive. Except for circuits that intentionally employ light (photo diodes, photo transistors, CCD & other camera imagers, UV erasable EPROMS), that light must be blocked or the circuit will not function.
That is not the case! There are a few green ICs or white photocouplers that are extremely rare.
Okay, 99.9% are black since Epoxy HC10 is quite expensive, and it’s also not a perfect heat conductor, so you’ll need a filler to improve the qualities. An industrial black sot was discovered to be an excellent heat transfer filler with exceptional qualities (embedding into epoxy, humidity resistance, and heat conduction)…. And soot is a dark color As a result, all ICs are black.
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