[SI-LIST] Re: IC package

  • From: "Rich Peyton" <p2rich@xxxxxxxxxxxxx>
  • To: <ludwig@xxxxxxxxxxxxxxxxx>, <s.raja@xxxxxxxxxxxxx>
  • Date: Tue, 17 Aug 2004 09:14:15 -0400

I believe black is the most stable, when you want to go to different =
colors
you are adding pigments to get the desired color which degrades the
integrity of the material causing cracks/fractures due to repeated =
thermal
expansion.

(Regarding plastics)
Black was also cheaper to make before, (remember mostly black and grey
plastics only) It has become cheaper to colorize the plastics.  Material
vendors have come a long way in matching the integrity characteristics =
of
any color you want, so I think it all comes down to cost -- it would =
cost
more to make, which in turn means lower profit. =20

I remember reading a good article on that once:

Try a Google search on "IC encapsulants", "epoxy encapsulants", etc... =
----=20

Rich




-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
On
Behalf Of Stefan Ludwig
Sent: Tuesday, August 17, 2004 7:59 AM
To: s.raja@xxxxxxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: IC package


It's because black is the best radiator of heat (see=20
http://www.newton.dep.anl.gov/askasci/phy00/phy00769.htm for instance).

Regards,

Stefan

s.raja wrote:

>why all IC packages are Black in colour?.
>Regards
>Raja
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--=20

Ludwig Systems Engineering         Consulting - Design - Implementation
WWW: www.ludwigsystems.com         System Architectures - FPGAs - PCBs
Ph/Fx: +41-43-355-58-73/74         Hardware - Firmware - Software

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