DIP packages & the 555

Ian King IanK at vulcan.com
Thu Sep 23 14:09:36 CDT 2010


> -----Original Message-----
> From: cctalk-bounces at classiccmp.org [mailto:cctalk-
> bounces at classiccmp.org] On Behalf Of Chuck Guzis
> Sent: Thursday, September 23, 2010 11:17 AM
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: RE: DIP packages & the 555
> 
> 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
> 

I'm sure that's the explanation - but I have an odd sense of humor.  :-) 




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