PCB Libraries Forum Homepage
Forum Home Forum Home > General > General Discussion
  New Posts New Posts RSS Feed - SODFL & SOTFL
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

SODFL & SOTFL
 Post Reply Post Reply
Author
Message
  Topic Search Topic Search  Topic Options Topic Options
mohamedjubair.k View Drop Down
Active User
Active User


Joined: 05 Sep 2022
Status: Offline
Points: 26 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mohamedjubair.k Quote  Post ReplyReply Direct Link To This Post Topic: SODFL & SOTFL
    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.
Back to Top
Back to Top
Tom H View Drop Down
Admin Group
Admin Group
Avatar

Joined: 05 Jan 2012
Location: San Diego, CA
Status: Offline
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.


 
Stay connected - follow us! X - LinkedIn
Back to Top
mohamedjubair.k View Drop Down
Active User
Active User


Joined: 05 Sep 2022
Status: Offline
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.
Back to Top
Tom H View Drop Down
Admin Group
Admin Group
Avatar

Joined: 05 Jan 2012
Location: San Diego, CA
Status: Offline
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. 


 
Stay connected - follow us! X - LinkedIn
Back to Top
mohamedjubair.k View Drop Down
Active User
Active User


Joined: 05 Sep 2022
Status: Offline
Points: 26 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mohamedjubair.k Quote  Post ReplyReply Direct Link To This Post Posted: 05 Mar 2023 at 8:53am
Thank you so much Tom!
Back to Top
MGOS View Drop Down
New User
New User


Joined: 23 Oct 2024
Status: Offline
Points: 6 		Post Options Post Options   Thanks (1) Thanks(1)   Quote MGOS Quote  Post ReplyReply Direct Link To This Post Posted: 23 Oct 2024 at 1:39am
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.
Back to Top
Tom H View Drop Down
Admin Group
Admin Group
Avatar

Joined: 05 Jan 2012
Location: San Diego, CA
Status: Offline
Points: 5719 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post Posted: 2 hours 57 minutes ago at 11:23am
SOD is Gull Wing leads: 



SODFL is Flat Leads: 



BTC (Bottom Terminal Component) = QFN, SON, PQFN, PSON, BGA, LGA. CGA, etc.
Stay connected - follow us! X - LinkedIn
Back to Top
 Post Reply Post Reply

Forum Jump Forum Permissions View Drop Down



This page was generated in 3.395 seconds.