QFN Thermal Tab Paste Mask %

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   Library Expert defaults to 50% paste mask reduction in the "Rules" tab. 
IPC says the range of Paste Mask Reduction should be 40% - 60%. 

Less than 40% is not enough and greater than 60% is too much.

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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: 5798	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply Topic: QFN Thermal Tab Paste Mask % Posted: 15 Jan 2020 at 11:20am
	Library Expert defaults to 50% paste mask reduction in the "Rules" tab. IPC says the range of Paste Mask Reduction should be 40% - 60%. Less than 40% is not enough and greater than 60% is too much.
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jnbrown Members Profile Send Private Message Find Members Posts Add to Buddy List Active User Joined: 13 Jan 2020 Status: Offline Points: 40	Post Options Post Reply Quote jnbrown Report Post Thanks(0) Quote Reply Posted: 15 Jan 2020 at 11:09am
	What is a good default value to use for QFN Thermal Tab Paste Mask %? I asked our contract manufacturer and they me to use the recommendation on the manufacturers data sheet, however most manufacturers do not specify this.