Hi  Dick,

Forget to solder 0402 by wave,

in case you will be so lucky to glue such small chips on PCB, when passing
over the hot wave, they will get "washed" away by the pressure of the hot
solder.

0603 is already a process limit (poor Q yield)

Gabriele



-----Messaggio originale-----
Da: TechNet [mailto:[log in to unmask]] Per conto di Richard D. Krug
Inviato: giovedì 31 gennaio 2013 22.35
A: [log in to unmask]
Oggetto: [TN] Glue and Wave Solder 0402 Resistors?

We've just run across a customer's redesign of a PWB adding 0402 resistors.
The product has been built for years with a glue and wave process for 0603's
to 1210's to IPC-A-610, class 3.  

I don't think we can reliably dispense adhesive between pads this close.  
Printing adhesive may be an option, but the stencil thickness may limit
volume applied for the larger parts.  
Finally, we may get solder bridging with 0402's in the wave.  

Does anyone have experience with a glue and wave process on 0402's?  

Dick Krug, CSSBB, CSMTPE
Senior Process Engineer
Sparton Complex Systems
30167 Power Line Road
Brooksville, FL  34602-8299
p (352) 540-4012  (Internal Ext. 2012)
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