DIP packages & the 555

Chuck Guzis cclist at sydex.com
Thu Sep 23 13:16:35 CDT 2010


On 23 Sep 2010 at 11:01, Ian King wrote:

> My favorite story about the 555 has nothing to do with its function,
> but rather its form.  I was working at an electronics store and a
> customer came in with a desperate need for a 555 (a radio station was
> off the air until the part was replaced in some critical circuit that
> should probably have been redundant in the first place).  I fetched
> our *last* 555 from the warehouse and noted that, in addition to the
> four legs coming out of each side, there was one coming out the end! 
> Of course, the jokes immediately started about the male version of the
> chip, and we were actually reluctant to sell our 'breeding stock' 555
> and speculated on how it had escaped from the 555 ranch.  But alas,
> the customer really REALLY needed the part, and off it went....  I've
> never seen another like it - although to be honest, I haven't expended
> much (any) energy in looking for one. 

I wonder if this wasn't part of the leadframe that had missed being 
sheared off.  If you carefully inspect a few older plastic DIPs, you 
can often spot the glint of the leadframe "tail" on the "bottom" end 
of the DIP.

--Chuck




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