[SI-LIST] Re: IC package

  • From: Ray Anderson <reanderson@xxxxxxxxxxxxx>
  • To: si-list@xxxxxxxxxxxxx
  • Date: Tue, 17 Aug 2004 09:20:27 -0700

Hal Murray wrote:

>>Black was also cheaper to make before, (remember mostly black and grey
>>plastics only)
>I assume the basic answer is cost.
>Clear plastic is available for LEDs and photo receptors - other 
>colors/filters too.  Anybody have an estimate as to how much more non-black 
Another reason for black (or other photo opaque color) other than clear 
is that ambient light shining on the die can have 'unintended 
consequences' . I remember a couple cases a long time ago where in one 
instance ambient light shining through the 'erase' window on an EPROM 
somehow changed timing enough to crash a system (covering the window 
with black tape restored normal functionality). In another case 120Hz 
noise was modulated onto some driver outputs in a de-lidded chip we were 
working on in the lab. Shielding the die from the ambient fluorescent 
lighting made the 120Hz nose on the outputs go away.


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