Dave,

Thank-you for the update.  

Do they plan to re-tool the graphite boats, or continue to run as-is?  The
situation will only get worse as time goes on.  Possibly, they can blank out
the severely offending sites in the tooling and continue to run for a while
longer.

It should not become a problem until they get so very rough they have to
practically dig the diode bodies out of the tooling.  What would concern me
are the parts produced as the tooling gets severely eroded, potentially
causing subtle small cracks in the seals.

Trust - but verify!

Best wishes

Steve C

-----Original Message-----
From: Dave He [mailto:[log in to unmask]] 
Sent: Wednesday, March 10, 2010 11:20 AM
To: 'TechNet E-Mail Forum'; 'Steven Creswick'
Subject: RE: [TN] Rough surface of glass diode (Fairchild 1N4148)

Steve,

Just received the failure report. 

The cause of rough surface is: The sealing boats in the line are keeping
used frequently; Sealing boats rubbed with materials then the surfaces of
the sealing boats become rough.  When glass body touch the surface of
sealing boats during assembly, glass body will be frayed by sealing boat and
cause the surface of glass rough.

Verification Result: 
According to electrical verification, returned samples are all confirmed as
good devices. The rough and bubble will not affect the reliability and
application.

So this part is good to go.

Regards,
 
Dave He
Ext: 333

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steven Creswick
Sent: Tuesday, February 09, 2010 5:47 AM
To: [log in to unmask]
Subject: Re: [TN] Rough surface of glass diode (Fairchild 1N4148)

Dave,

It could be that the glass perform that forms the end of the package did not
totally [re]flow during the package sealing process.  If that was the case,
the roughness that you are seeing is the surface of the non-flowed glass
perform, or the texture of the graphite reflow fixture.

Steve C



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