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mohamedjubair.k View Drop Down
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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 View Drop Down
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Points: 5719 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post Posted: 03 Mar 2023 at 8:59am
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 View Drop Down
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Points: 26 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mohamedjubair.k Quote  Post ReplyReply Direct Link To This Post Posted: 03 Mar 2023 at 6:10pm
Hi Tom,

Thank you for you quick reply. 

Actually I need information about Flat Lead component like attached.
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Tom H View Drop Down
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Points: 5719 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post Posted: 04 Mar 2023 at 9:45am
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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Thank you so much Tom!
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Originally posted by Tom H Tom H wrote:

It's the same concept.


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:
  • Flat Gull wing leads -> mentions SOD (not SODFL specifically),
  • Flat lug leads -> J version has added an image of LED (Figure 8-140), whilst pin looks similar to SODFL pin or
  • BTC -> whilst image also look similar to SODFL pins (in regards to Figure 8-161)

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 View Drop Down
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Points: 5719 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post Posted: 26 Nov 2024 at 11:23am
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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