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What are MSL ratings?

April 26, 2017MSL ratings

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What are MSL ratings?

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MSLs (moisture sensitivity level) comprise a rating system for determining the proper handling protocols for surface mount packages, in order to avoid damage during the solder reflow process. The MSLs are provided in industry standard J-STD-020. Handling procedures are described in J-STD-033. To avoid delamination from vaporization effects, take care to avoid exceeding the maximum floor life of the devices. In this context, floor life is linked to the rate at which the device absorbs atmospheric moisture, represented by the MSL rating, with MSL 1 being the most resistant to delamination. MSL ratings are linked to peak process temperatures. If processing near maximum temperature levels, it may be necessary to handle devices according to protocols for lower MSL levels. Allegro testing follows J-STD-020, using 260°C for peak reflow temperature. Information on the MSL rating is provided on the device packing labels.