SODFL & SOTFL |
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mohamedjubair.k
Active User Joined: 05 Sep 2022 Status: Offline Points: 26 |
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Posted: 03 Mar 2023 at 4:13am |
Hi Tom,
I read the IPC-7351 document and I did not see solder joint goal table for flat leads [SODFL and SOTFL] components. But in library calculator Toe joint value found as 0.20 mm. From where did they find this value. Is this 0.20 mm is fine for Toe end. |
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Tom H
Admin Group Joined: 05 Jan 2012 Location: San Diego, CA Status: Online Points: 5718 |
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Per IPC J-STD-001 Standard, the Toe value is determined by the Terminal Lead Thickness.
This is the example of the Gull Wing Terminal Lead form.
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mohamedjubair.k
Active User Joined: 05 Sep 2022 Status: Offline Points: 26 |
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Hi Tom,
Thank you for you quick reply. Actually I need information about Flat Lead component like attached.
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Tom H
Admin Group Joined: 05 Jan 2012 Location: San Diego, CA Status: Online Points: 5718 |
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It's the same concept. You take the "Nominal c" dimension (and round up to the nearest 0.05) and that is your Toe goal.
Anything bigger than that is a waste of PCB real-estate and excess solder. The main strength in the solder joint is under the terminal lead. |
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mohamedjubair.k
Active User Joined: 05 Sep 2022 Status: Offline Points: 26 |
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Thank you so much Tom!
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MGOS
New User Joined: 23 Oct 2024 Status: Offline Points: 6 |
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Apologies
for hijacking this thread, but I'd rather ask here then create a new
thread for the same SODFL package type, if that is OK.
I have some difficulties classifying this type of components as to IPC standard (IPC-A-610J, class 3); mainly, is there a definite type to which they belong and I can check during PCB inspection? For instance, based on figures and specs I could classify as:
I know text has precedence to images that is why I am asking this to finally sort this out for me. Thank you for information. |
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Tom H
Admin Group Joined: 05 Jan 2012 Location: San Diego, CA Status: Online Points: 5718 |
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SOD is Gull Wing leads:
SODFL is Flat Leads: BTC (Bottom Terminal Component) = QFN, SON, PQFN, PSON, BGA, LGA. CGA, etc. |
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