Landpattern calculation

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Justin Joel

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how to calculate pad length for SMD
 

as far as i know you can use the pad length specified
recommended land pattern in the datasheet of the specific component.
if there is only component dimensions give 20 mil oversize for the specified length of pad
 

SHABU said:
as far as i know you can use the pad length specified
recommended land pattern in the datasheet of the specific component.
if there is only component dimensions give 20 mil oversize for the specified length of pad
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Thanks Sir.But I want Toe and Heel calculation(how much tolerance add for toe and heel)

---------- Post added at 13:45 ---------- Previous post was at 13:44 ----------

Thanks Sir.But I want Toe and Heel calculation(how much tolerance add for toe and heel)
 

You can follow each 10 mil oversize for both toe and hell.
So that the actual pad mounts in the center of the land.
 

Second the use of IPC-7351, you cannot use a signle size fro oversizing a pad.
 

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