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Thermal Pad Issue
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m.elsayed View Drop Down
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Joined: 22 Sep 2016
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Points: 73 		Post Options Post Options   Thanks (0) Thanks(0)   Quote m.elsayed Quote  Post ReplyReply Direct Link To This Post Topic: Thermal Pad Issue
    Posted: 14 Sep 2025 at 5:56pm
I can adjust Thermal Pad by this parameter, but when open in Altium gives wrong value.

Can have more explain how to adjust this?
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Tom H View Drop Down
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Points: 5865 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post Posted: 14 Sep 2025 at 6:15pm
80% Paste Mask Reduction will not give you a Checker Board Pattern. 

80% Paste Mask Reduction will provide a single paste mask aperture. 

70% is the highest Paste Mask Reduction to generate a Checker Board Pattern. 
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m.elsayed View Drop Down
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Points: 73 		Post Options Post Options   Thanks (0) Thanks(0)   Quote m.elsayed Quote  Post ReplyReply Direct Link To This Post Posted: 14 Sep 2025 at 9:48pm
 i have attached fpx, can please we have explain on it , 
if 80% not applicable why tool not block user , rather than get wrong values, please add more details for this point, when apply 70 % what values should appears in Altium
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Tom H View Drop Down
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Points: 5865 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post Posted: Yesterday at 7:29am
You must consider all the rules. 

You have a Minimum Paste Mask web set to 0.20 mm. 

You need to keep the Thermal Pad Paste Mask 0.10 mm indented from the pad edge. 

80% is doable however, you're not going to get a Checker Board Pattern. 

Many users set Thermal Pad Paste Mask to 100% and allow the Assembly Shop Stencil Mfr. design the paste mask reduction. 

All we're saying is that we found out that 70% is the highest you can go a still get a Checker Board Pattern. 

We're not going to limit the software program and not allow 80%. If you're not educated on the mathematics of paste mask reduction, and the consequences of your Option settings, that's not our responsibility. It's trial and error. 
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m.elsayed View Drop Down
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Points: 73 		Post Options Post Options   Thanks (0) Thanks(0)   Quote m.elsayed Quote  Post ReplyReply Direct Link To This Post Posted: 2 hours 16 minutes ago at 5:14am
Thanks alot Tom for your support and great help
the purpose of question is to get understand the information from expert one like you
and know how it works and check what issue on configuration or setting i did
can find screen below for my settings , and help
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