Through-hole Solder & Paste Mask Pad Stack Issue

Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic

   While I use Footprint Expert for creating a through-hole footprint, I find paste mask and solder mask not equal to Zero '0', also pad type not be simple type.
Attached FPX
uploads/11979/throughhole.fpx

Altium Screenshot:

Author	Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic
m.elsayed Members Profile Send Private Message Find Members Posts Add to Buddy List Advanced User Joined: 22 Sep 2016 Status: Offline Points: 195	Post Options Post Reply Quote m.elsayed Report Post Thanks(0) Quote Reply Topic: Through-hole Solder & Paste Mask Pad Stack Issue Posted: Yesterday at 12:13pm
	While I use Footprint Expert for creating a through-hole footprint, I find paste mask and solder mask not equal to Zero '0', also pad type not be simple type. Attached FPX uploads/11979/throughhole.fpx Altium Screenshot:



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: 5934	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply Posted: 4 hours 13 minutes ago at 10:29am
	What's wrong with having negative values? When a negative paste mask value is the same value as the pad, it turns off that shape. We don't understand what the issue is. We know that you want to see a zero '0' for the paste mask if there is none, but having a negative value is the same thing.
	Stay connected - follow us! X - LinkedIn

m.elsayed Members Profile Send Private Message Find Members Posts Add to Buddy List Advanced User Joined: 22 Sep 2016 Status: Offline Points: 195	Post Options Post Reply Quote m.elsayed Report Post Thanks(0) Quote Reply Posted: 2 hours 7 minutes ago at 12:35pm
	1st - Pad type should be simple, not like shown in image 2nd - Solder Mask expansion = 0 and select not inherit Altium rule when building 3rd - Paste Mask value for fiducials should equal 0. However, a negative value appears

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: 5934	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply Posted: 1 hour 45 minutes ago at 12:57pm
	There is no such thing as a negative Solder Mask on a pad. i.e.: all SMD and PTH pads must have Solder Mask. The only time the value is negative is when the pad stack uses Solder Mask Defined technology. The Negative Paste Mask value only appears in Fiducials. Note: no one uses Local Fiducials any more. Ask your assembly shop if they need them. Surface Mount pad stack Paste Mask is the same value as the pad (1:1 scale) except for Thermal Pad checker board patterns. Through-hole pad stacks do not use Paste Mask unless you are using Pin-in-Paste (PnP) technology. If you use PnP technology then the Paste Mask value is normally 1:1 scale of the pad size (or bigger).
	Stay connected - follow us! X - LinkedIn