Folks,

 

We have a case where the IPC-2222 recommendation for thermal relief
(total .160 cumulative copper web for all layers) is exceeded by the
current carrying requirement of the circuit on a through hole pin. The
IPC specification states that "the total of the thermal relief
cross-sectional area divided by the number of planes connected to the
plated-through hole shall not violate current carrying capacity
requirements for a given hole". Then the spec goes on to state on the
master drawing where this violation occurs in the layout.

 

I was wondering if other folks typically use web sizes greater than the
recommended .160 cumulative. If so, how large? Also, how are these leads
being soldered - hand, wave-flow?

 

Thanks much for your help!

 

Regards,

Rick

 



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