Notice
2.Flux
2-1. An excessive amount of flux generates a large quantity of flux gas, which can cause a deterioration of solderability,
ꢀ so apply flux thinly and evenly throughout. (A foaming system is generally used for flow solderring.)
2-2. Flux containing too high a percentage of halide may cause corrosion of the terminations unless there is
ꢀ
sufficient cleaning. Use flux with a halide content of 0.1% max.
2-3. Strong acidic flux can corrode the capacitor and degrade its performance.
Please check the quality of capacitor after mounting.
3.Leaching of the terminations
［As a Single Chip］
Set temperature and time to ensure that leaching of the
terminations does not exceed 25% of the chip end
area as a single chip (full length of the edge A-B-C-D
shown at right) and 25% of the length A-B shown as
mounted on substrate.
A
B
D
Termination
(Outer Electrode)
C
［As Mounted on Substrate］
B
A
3.Reflow soldering
The flux in the solder paste contains halogen-based substances and organic acids as activators.
ꢀ Strong acidic flux can corrode the capacitor and degrade its performance.
Please check the quality of capacitor after mounting.
4.Washing
1. Please evaluate the capacitor using actual cleaning equipment and conditions to confirm the quality,
and select the solvent for cleaning.
2. Unsuitable cleaning may leave residual flux or other foreign substances, causing deterioration of
electrical characteristics and the reliability of the capacitors.
5.Coating
1. A crack may be caused in the capacitor due to the stress of the thermal contraction of the resin during curing process.
The stress is affected by the amount of resin and curing contraction. Select a resin with low curing contraction.
The difference in the thermal expansion coefficient between a coating resin or a molding resin and the capacitor
may cause the destruction and deterioration of the capacitor such as a crack or peeling, and lead to the deterioration
of insulation resistance or dielectric breakdown.
Select a resin for which the thermal expansion coefficient is as close to that of the capacitor as possible.
A silicone resin can be used as an under-coating to buffer against the stress.
2. Select a resin that is less hygroscopic.
Using hygroscopic resins under high humidity conditions may cause the deterioration of the insulation resistance
of a capacitor. An epoxy resin can be used as a less hygroscopic resin.
3．The halogen system substance and organic acid are included in coating material, and a chip corrodes
ꢀꢀby the kind of Coating material. Do not use strong acid type.
JEMCGC-01743G
28
MURATA [ muRata ]
