Hi,

at least, on sample criteria (SPC) it could be helpful to X-ray those solder
joint.

Not so easy  and reliable) way to visual inspect hell fillets (F) in the
middle side of QFPs leads, mainly if fine pitch.

Some time, to comply with Class 3 it could be a mirage.....
(different Lead Free alloys, different leads plating (e3, e4, etc often not
known)

Gabriele

-----Messaggio originale-----
Da: TechNet [mailto:[log in to unmask]] Per conto di Stadem, Richard D.
Inviato: giovedì 4 dicembre 2014 15.49
A: [log in to unmask]
Oggetto: Re: [TN] Fine Pitch Heel Fillets

We use standard Leica and Olympus microscopes. I have used Mantis systems at
other clients but they were eventually phased out as the operators all
preferred the standard scopes for clarity and the Mantis were just too large
and in the way.
However, for visual inspection of heel fillets and for inspection of BGA
solder balls and other tight spaces that have tall adjacent components that
block direct viewing, all of the companies I work for utilize inspection
prisms that work in conjunction with the standard scopes. They allow the
inspectors to look in pretty much every direction, regardless of the
position of the scope itself. The hand-held prisms can be purchased from a
number of supply stores. 
Here is one:
http://www.eis-inc.com/suppliers/productlist.asp?prod_area=270&showcase_no=2
00439UC2.
Please understand that some brands of these mirrors are more "robust" than
others. Try some from different manufacturers and select those that your
operators like best.
Dean


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Vargas, Stephen M
Sent: Thursday, December 04, 2014 7:51 AM
To: [log in to unmask]
Subject: [TN] Fine Pitch Heel Fillets

Good Morning:

     We are looking for some enhanced tools / equipment for inspecting fine
pitch leads for Class 3 compliant heel fillets. We currently use standard
microscopes and Mantis systems. I'm sure there are a lot of equipment
suppliers who advertise exactly what I am looking for, but I want input from
actual users. Thanks.

Regards,
Steve Vargas


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