[SI-LIST] Re: IC package

  • From: "Matthew Kaufmann" <mkaufmann@xxxxxxxxxxxx>
  • To: si-list@xxxxxxxxxxxxx
  • Date: Wed, 18 Aug 2004 10:43:44 -0700

I think this was mentioned before but the encapsulant does not provide =
much
protection from cosmic/alpha particles.  Actually, it's a fairly =
significant
source of alpha particles (from the silica filler).

-Matt

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
On
Behalf Of Andrew Ingraham
Sent: Tuesday, August 17, 2004 5:51 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: IC package


[OK, this is try number 3.  I don't know what's blocking my mail.]

Steve Weir wrote:

> Stefan, Dr. Photoelectric is a lot more concerned with photons that
> dancing
> molecules.

Translation: I think what you're saying (in your strange way) is that =
opaque
packages are best, so that light doesn't reach the die, where =
photo-electric
effects would otherwise occur and disturb the electronics.  (Yes, it
happens, I've seen it.)

My guess is that's one of the big reasons, but others like cost and
mechanical considerations are there too.  And then there's radiation =
(Alpha
particles), but I think that mostly comes from the metal in the solder,
leadframe, or pins.

Years ago there were some white IC packages.  I think they may have been
ceramic, not plastic.  They were opaque too, or at least reasonably so.

Regards,
Andy



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