chips vs chad

Chuck Guzis cclist at
Fri Apr 9 00:35:03 CDT 2010

On 9 Apr 2010 at 6:17, Rod Smallwood wrote:

> We used a special Weller tip. It consisted of metal block (about the
> same size and shape as an IC base with holes where the pins would be)
> attached to a Weller tip sleeve (ie the part that held the tip to the
> heating barrel) On the component side you had a spring loaded clip
> that exerted even pressure on the chip away from the board. Apply said
> tip to the copper side of the board and the chip came out complete.
> Then the solder sucker was used to clear out the holes. 

I remember those--you could get them in various patterns, such as a 
round cup for TO-100 packages.  (I may still have one somewhere for 
my Ungar iron).  My recollection is that as manufacturers went to 
multi-layer PCBs and buried ground planes that the amount of heat 
required by the iron to perform the job got to be ridiculous.  The 
only DIP version I've seen worked with 0.300" wide 14/16-pin 
packages.  I've never seen one for a 40- or 64-pin DIP.


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