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MLCC Product Manual
4-11-3. Cautions for selecting Adhesive
Depending on the type of the chosen adhesive, MLCC insulation resistance may be degraded.
In addition, MLCC may be cracked by the difference in contractile stress caused by the different
contraction rate between MLCC and the adhesive.
4-11-4. Cautions for the amount of applied adhesive and curing temperature
· The inappropriate amount of the adhesive cause the weak adhesive strength, resulting in the a
mounting defect in MLCC
· Excessive use of the adhesive may cause a soldering defect, loss of electrical connection,
incorrect curing, or slippage of a mounting position, thereby an inflow of the adhesive onto a
land section should be avoided.
· If the curing temperature is too high or the curing time is too long, the adhesive strength will
be degraded. In addition, oxidation both on the outer termination (Sn) of MLCC and the
surface of the board may deteriorate the solderability.
4-12. Flux
4-12-1. The excessive amount of flux generates excessive flux gases which may deteriorate solderability.
Therefore, apply the flux thin and evenly as a whole.
4-12-2. Flux with a high ratio of halogen may oxidize the outer termination of MLCC, if cleaning is not
done properly. Therefore, use flux with a halogen content of 0.1% max.
4-12-3. Strong acidic flux can degrade the MLCC performance
4-12-4. Check the solder quality of MLCC and the amount of remaining flux surrounding MLCC after the
mounting process.
4-13. Coating
4-13-1. Crack caused by Coating
A crack may be caused in the MLCC due to amount of the resin and stress of thermal
contraction of the resin during coating process.
During the coating process, the amount of resin and the stress of thermal contraction of the
resin may cause cracks in MLCC
The difference of thermal expansion coefficient between the coating, or a molding resin may
cause destruction, deterioration of insulation resistance or dielectric breakdown of MLCC such
as cracks or detachment, etc.