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Moisture Sensitive Device over baked

Yngwie

#18869

Moisture Sensitive Device over baked | 15 February, 2002

What are the consequences of having the Moisture sensitive component to be overbaked. Say if the specs. calls for 125 C +/- 5 C for 48 hours, but they components were accidently left in the oven during a weekend, wih the oven still operating, to make it up to 96 hours. What would happen to the components ? Is the longer the baking the better ? or too long could cause other problem other than solderability ?

Thanx in advance.

nifhail

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#18871

Moisture Sensitive Device over baked | 15 February, 2002

The joint IPC/JEDEC standard currently specifies a limit of one bake cycle, regardless of the temprature or duration. In the proposed revision this will be replaced by a maximum cumulative duration of 48 hours at 125C.

The reason identified for this limit is solder oxidation and/or intermetallic growth, which if excessive can result in solderability problems during assembly.

The standard also specifies that if the limit is to be exceeded the supplier should be consulted.

My opinion is that you should handle this the same way as you would any other component with solderability issues.

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