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Date: | Thu, 6 Feb 2014 18:48:52 +0100 |
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Hello Lars,
(Thank you Steve)
In my opinion, version (E) should allow a better stress relive when CTE of
parts (PCB, Solder, Capacitor Body) contracting at -40°.
Take care about lead performing for any indentation or tight corner.
Less critical at + 80°C, plastic parts (soft) tend to relive stress
Regards
Gabriele
-----Messaggio originale-----
Da: TechNet [mailto:[log in to unmask]] Per conto di Steve Gregory
Inviato: giovedì 6 febbraio 2014 16.11
A: [log in to unmask]
Oggetto: Re: [TN] VB: Lödproblem + bild
Hi Lars!
Got your pictures and have them posted. Here's the sketch:
http://stevezeva.homestead.com/SolderSketch.pdf
and here's the photo of the cap:
http://stevezeva.homestead.com/Cap.jpg
Steve
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Lars Wallin
Sent: Thursday, February 6, 2014 6:15 AM
To: [log in to unmask]
Subject: [TN] VB: Lödproblem + bild
Hello Technet,
Please check the attach sketch.
It involves soldering a large capacitor (20 x 30 x 40 mm see enclosed
picture) and then mould in the whole board with a warm polyuretan mould
mass. The requirement is that the solder joint should withstand 300 cycles
(from-40C to +85 C).
Figure A, can not cope with the requirement of 300 cycles. a = polyurethane
mass.
Which of the figures B-E do you think would be a better solution? Or would
you suggest any other solution?
Looking forward to your answer.
Best Regards
Lars Wallin
IPC European Representative
Location: Stockholm, Sweden
Phone: +46 8 26 10 07
Mobile: +46 70 212 74 39
Email: [log in to unmask]<mailto:[log in to unmask]>
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