Wee Mei

The question of design rules came up by the fact that the wetting
behaviour of led free solder in the possible process window is somewhat
different from the one of SnPb. However, our trials in LEADFREE and some
pilot production in the companies associated in the project with
standard design rules showed no problems in the soldering process due to
the design. It can be, in wave soldering, if space is very restricted
and thus no solder thieves can be used when soldering fine pitch
components and components are set close together, you see more bridges .
But it has to be emphasised that, if the IPC design rules are
consequently applied, lead free soldering is not a big deal.


Best regards


Guenter

EMPA
Swiss Federal Institute for Materials Testing and Research
Centre for Reliability
Guenter Grossmann,  Senior Engineer

8600 Duebendorf
Switzerland

Phone: xx41 1 823 4279
Fax :     xx41 1823 4054
mail:     [log in to unmask]

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