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D-pak end joint wetting

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#84775

D-pak end joint wetting | 17 April, 2020

IPC calls out 100% wetting to land. I need to understand why this is needed and what functionality I will lose if I have joints at 80%

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#84776

D-pak end joint wetting | 19 April, 2020

A-610G 7.5.16 Components with Bottom Thermal Plane Terminations (D-Pak) says: 100% wetting to land in the end-joint contact area.

Is that what you're asking about?

Regards, David Fish [davef] Technical Editor & Customer Advocate

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#84777

D-pak end joint wetting | 19 April, 2020

Yes

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#84778

D-pak end joint wetting | 19 April, 2020

A-620G doesn't require 100% wetting to the thermal pad. It requires 100% wetting to the land in the end-joint area.

The end joint is the portion of the solder connection that is at the top [or bottom] of the connection. Look at 7.1.3 Solder Joint Acceptance Criteria, Tables 2, 3, & 4 for a better explanation.

In the first paragraph of 7.5.16, it says, "When soldering these types of components, voiding in the thermal plane is common."

Regards, Dave Fish [davef] Technical Editor & Customer Advocate

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Reflow Oven

Voidless Reflow Soldering