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QFN Thermal Tab Paste Mask %

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jnbrown View Drop Down
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    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.

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Tom H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post 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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