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AN2639 Datasheet(PDF) 10 Page - STMicroelectronics

Part # AN2639
Description  Soldering recommendations and package information for Lead-free ECOPACK microcontrollers
PDF  15 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2639 Datasheet(HTML) 10 Page - STMicroelectronics

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SMD gluability
AN2639
10/15
DocID14016 Rev 4
5
SMD gluability
It is strongly recommended to follow glue application specifications from their glue supplier,
and to use 100% glue polymerization for optimal glue efficiency.
Figure 4. Recommended profiles for glue polymerization using regular oven and
linear flow oven
Figure 5. Gluability evaluation with a shear test
Various tests have shown that glue shear test specification limit conforms to the IPC SM817
standard (0.75 kg/mm2 minimum). Customer complaints usually happen when values are
below 0.5 kg/mm2. It has been verified that below 0.25 kg/mm2 components fall from PCB
during handling. General capability in plastic SMD is greater than 1 kg/mm2.



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