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Pad Sizes For Single Sided Boards?

R

RichardD

Jan 1, 1970
0
Does any one know if IPC recommend a size of annular rings for pads
when used on Single Sided Boards. I know that they should be larger
than used for double sided and multilayer boards.
 
S

Simon Peacock

Jan 1, 1970
0
IPC are too high tech for this.. For single sided boards.. ALAP.. thats as
large as possible.
consider 80 mil pads on a 100 mil pitch.. or even go for an 80 x 100 oval
pad (or larger). If you are planning to rework it is important as the pads
will tend top become unglued very easily. I also turn on the fillets so
that the traces come out of pads with the most copper possible. Minimum
trace / clearance .. 20 mil / 20 mil too

oh.. of course 80 mil means no tracks between pads but the resulting board
can be worked easier :)

Simon
 
S

Spehro Pefhany

Jan 1, 1970
0
IPC are too high tech for this.. For single sided boards.. ALAP.. thats as
large as possible.
consider 80 mil pads on a 100 mil pitch.. or even go for an 80 x 100 oval
pad (or larger). If you are planning to rework it is important as the pads
will tend top become unglued very easily. I also turn on the fillets so
that the traces come out of pads with the most copper possible. Minimum
trace / clearance .. 20 mil / 20 mil too

oh.. of course 80 mil means no tracks between pads but the resulting board
can be worked easier :)

For 100 mil pitch, DIPs, etc, you can use pads that are oblong, sort
of like this: (fixed width font)...

--------------
/ . \
| ( ) |
\ - /
---------------

... and shave down the edges of only those pads that have to have
traces run between them.

Best regards,
Spehro Pefhany
 
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