Re: Goo on calculator PCBs
From: Guy Macon (http://www.guymacon.com)
Date: 11/20/04
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Date: Sat, 20 Nov 2004 05:15:48 +0000
ghazan.haider@gmail.com (Ghazan Haider) wrote:
>When I opened up a few calculators, and Commodore64 expansion
>cartridges a long time ago, some PCBs have wires that converge into
>what seems like a solidified drop of black plastic or ceramic. The
>drop looks like it was liquid once upon a time, and is too hard to
>remove, to check if there was an IC underneath or just silicon.
>Apparently the object (IC or just silicon die) was placed on the PCB
>connected to the wires, and the goo dropped on and solidified.
>What is this process?
That's epoxy over a bare die wirebonded to the board. Same technology
that's inside an IC, except the little wires go to the PWB instead of
the IC lead frame.
> Why dont they do this anymore?
Who says we don't dom it anymore?
>And can home hobbyists do it?
I have a prototype-quantity wirebonder in my lab, but it was quite
expensive, Far better to use ICs until you reach the point where
you are prototyping something that you will make 100,000/day of.
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