Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Alvaro Carrillo

#12066

pads size | 5 April, 1999

Hi, Somebody know how to calculate the size of pads for different IC's: QFP's, SOIC, SOJ, etc.

any help is apreciated.

thanks

AC

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Justin Medernach

#12067

Re: pads size | 6 April, 1999

| Hi, | Somebody know how to calculate the size of pads for different IC's: QFP's, SOIC, SOJ, etc. | | any help is apreciated. | | thanks | | AC | Hi AC, Recommended pad geometries come with component specs. Your circuit will be comprised of given electronic components. Each of those components will have physical, electrical, and recommended land geometry specifications.

Regards, Justin |

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#12068

Re: pads size | 6 April, 1999

| Hi, | Somebody know how to calculate the size of pads for different IC's: QFP's, SOIC, SOJ, etc. | | any help is apreciated. | | thanks | | AC | Al: Justin's comments are well taken. Who should know better about pad sizes that the component manufacturer?

Additionally, you might consider IPC-SM-782 as a starting point for basic components. Further, IPC (www.ipc.org) has a pad calculator at their site. Finally, the folks at SMTnet often have experience with specific components.

TTYL

Dave F

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