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AGONZ67 View Drop Down
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    Posted: 08 Sep 2015 at 12:08pm
The image shown for CFP and CQFP is shown with gullwing leads.
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Tom H View Drop Down
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Points: 5716 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post Posted: 08 Sep 2015 at 2:06pm
All CFP and CQFP must have their leads formed with a lead bender to the shape of a Gull Wing lead.
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AGONZ67 View Drop Down
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Yes, I understand that, but I am looking for information on how to calculate the dimensions, "L" & "E" to enter into PCBLE? Is there a formula for arriving at these dimensions? From the image below, where do I get the information for the bends, the height of the leads, the length of the leads etc to enter into the Library expert?
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Tom H View Drop Down
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The dimensions must come from the assembly shop or manufacturer that is performing the lead bending.
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Points: 119 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AGONZ67 Quote  Post ReplyReply Direct Link To This Post Posted: 09 Sep 2015 at 11:56am
Once the dimensions are provided from the assembly shop or manufacturer it is created as either a CFP, or CQFP, which appears to be calculated the same as SOIC, or QFP ? What benefit is provided by having a separate CFP, CQFP entry other than the prefix of the name?
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Tom H View Drop Down
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Points: 5716 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post Posted: 09 Sep 2015 at 1:24pm
Because Library Expert outputs perfect 3D STEP models and there is a BIG difference in a black plastic molded QFP and a Ceramic CQFP.
 
Also, the FPX file "Physical Description" is different and IPC-7351 standard has different categories for these component families.
 
That's about it.
 
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