Thermal Pad Issue

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   I can adjust Thermal Pad by this parameter, but when open in Altium gives wrong value.
Can have more explain how to adjust this?

uploads/11979/nm.jpg

uploads/11979/exposed_pad_paste_mask=-3.2_same_as_size.jpg

uploads/11979/ep.fpx

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m.elsayed Members Profile Send Private Message Find Members Posts Add to Buddy List Advanced User Joined: 22 Sep 2016 Status: Offline Points: 72	Post Options Post Reply Quote m.elsayed Report Post Thanks(0) Quote Reply Topic: Thermal Pad Issue Posted: 21 hours 59 minutes ago 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? uploads/11979/nm.jpg uploads/11979/exposed_pad_paste_mask=-3.2_same_as_size.jpg uploads/11979/ep.fpx



Tom H Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5865	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply Posted: 21 hours 40 minutes ago 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 Members Profile Send Private Message Find Members Posts Add to Buddy List Advanced User Joined: 22 Sep 2016 Status: Offline Points: 72	Post Options Post Reply Quote m.elsayed Report Post Thanks(0) Quote Reply Posted: 18 hours 7 minutes ago 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

Tom H Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5865	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply Posted: 8 hours 26 minutes ago 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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