Howard,

Not common but it does happen.  I have witnessed this once.  When I was working at Fisher Controls International.  This was in the pre ICT days.  Each assembly type had a custom made test box designed and built for it.  One of the test department folks called us out to see this.  He had  a completed assembly on the test box.  The assembly was fully functional, passed all set up and test process.  When he had finished test he noticed a fourteen pin Cerdip missing it's lid.  Electrically sound.  We joked about shipping it that way but of course off to repair it went.  Cerdips can fail at the glue line if impacted hard or if the bond was compromised in some fashion when it was made.  As long as it is very rare all you can do is scrap the bad part or tube of parts if your uncomfortable with the risk on the balance of parts in the tube.

Drew Meyer

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Watson, Howard August
Sent: Friday, March 13, 2015 9:36 AM
To: [log in to unmask]
Subject: [TN] Mechanical failure of 8-pin Cerdip

Hello TechNet,

I have an IC Op Amp that was found in stock with the lid separated. The stock room discovered this while kitting components, so this part was minimally handled. It was stored in the original IC tube. Collectively, we have never seen an occurrence of something like this, and I wonder if any of you have experienced this before. The explanation I got from the manufacturer is that it is most likely a packing and/or handling problem and that if there is too much slack in the tubes, the parts colliding together could cause the lid to pop off. Wouldn't the seal material be more robust than to allow the lid to pop off? My concern is that we have 120 of these all from one lot, and if there was a processing problem, then maybe I have some other poorly bonded lids that may separate. Do you think my concern is valid, or is this a one-off rare handling caused defect? These are space grade parts.

Thanks to Steve, a couple pictures are posted on the links below. I don't know what could be determined from the first picture, other than yes, the lid definitely popped off! The second picture shows another IC with a lid slightly skewed, but within tolerance I believe. Thanks in advance for any suggestions you can offer.

http://stevezeva.homestead.com/RH1078MJ8-1.jpg
http://stevezeva.homestead.com/RH1078MJ8-2.jpg

Howard A. Watson


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