PCB Assembly Services - Screaming Circuits: Moisture Sensitive Parts


Moisture Sensitive Parts

Avoid moisture-caused delays.

Most of you have probably seen the "moisture Sensitive" components symbol. Most of you probably Msd_logo_75 understand its meaning and significance. However, in the topsy-turvy world of prototyping, details sometimes hide when they shouldn't.

From time to time, we receive moisture sensitive components that are not sealed in moisture barrier packaging. This means that we have to treat it as though it has absorbed too much moisture - and usually it has. According to the JDEDC standard, J-STD-033B.1, there are quite a few ways for components to be at risk. If the components are at risk, according to the standard, we are supposed to bake them for 48 hours before assembly.

Naturally, if you need a 24 or 48 hour assembly and we have to bake for 48 hours, something doesn't fit. If you don't want the components baked, but want them used as-is, please tell us in the special instructions when you place your order. If you don't tell us, we will try and contact you. If we can't get ahold of you, we will do our best to determine the risk and we may stop your job to bake the components. If we do have to bake them, your turn-time guarantee starts after baking.

The best procedure is to leave the components sealed in the original moisture barrier packaging when you ship them to us. If you open the packages, please let us know your preference for baking or no-baking. Take a look at our earlier MSD post for a bit more information.

Duane Benson
Baking should be for cookies, pies and cakes.


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Your blog is very informative.It is pretty nice topic,your
post and experienced serve and teach me how to eliminate risk and make it more
simple and manageable.

Thanks for the tips… Best regards.

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