■ PRECAUTIONS
Precautions on the use of Multilayer Ceramic Capacitors
4. Soldering
◆Selection of Flux
Since flux may have a significant effect on the performance of capacitors, it is necessary to verify the following conditions prior to use;
（1）Flux used shall be less than or equal to 0.1 wt%（in CI equivalent）of halogenated content. Flux having a strong acidity content shall not be applied.
（2）When shall capacitors are soldered on boards, the amount of flux applied shall be controlled at the optimum level.
（3）When water-soluble flux is used, special care shall be taken to properly clean the boards.
Precautions
◆Soldering
Temperature, time, amount of solder, etc. shall be set in accordance with their recommended conditions.
Sn-Zn solder paste can adversely affect MLCC reliability.
Please contact us prior to usage of Sn-Zn solder.
◆Selection of Flux
1-1. When too much halogenated substance（Chlorine, etc.）content is used to activate flux, or highly acidic flux is used, it may lead to corrosion of terminal elec-
trodes or degradation of insulation resistance on the surfaces of the capacitors.
1-2. Flux is used to increase solderability in wave soldering. However if too much flux is applied, a large amount of flux gas may be emitted and may adversely affect
the solderability. To minimize the amount of flux applied, it is recommended to use a flux-bubbling system.
1-3. Since the residue of water-soluble flux is easily dissolved in moisture in the air, the residues on the surfaces of capacitors in high humidity conditions may cause
a degradation of insulation resistance and reliability of the capacitors. Therefore, the cleaning methods and the capability of the machines used shall also be
considered carefully when water-soluble flux is used.
◆Soldering
• Ceramic chip capacitors are susceptible to thermal shock when exposed to rapid or concentrated heating or rapid cooling.
• Therefore, the soldering must be conducted with great care so as to prevent malfunction of the components due to excessive thermal shock.
• Preheating : Capacitors shall be preheated sufficiently, and the temperature difference between the capacitors and solder shall be within 100 to 130℃.
• Cooling : The temperature difference between the capacitors and cleaning process shall not be greater than 100℃.
［Reflow soldering］
【Recommended conditions for eutectic soldering】
【Recommended condition for Pb-free soldering】
300
300
Peak 260℃ Max.
Within 10sec.
Preheating
230℃
Within 10 sec.
60sec. 60sec.
200
200
100
0
Slow
cooling
Min.
Min.
Slow cooling
100
Heating above
Preheating 150℃
230℃
Capacitor
PC board
60sec. Min.
40sec. Max.
0
Solder
T
Caution
①The ideal condition is to have solder mass（fillet）controlled to 1/2 to 1/3 of the thickness of a capacitor.
②Because excessive dwell times can adversely affect solderability, soldering duration shall be kept as
close to recommended times as possible.
Technical
consider-
ations
［Wave soldering］
【Recommended conditions for eutectic soldering】
【Recommended condition for Pb-free soldering】
300
300
Peak 260℃ Max.
230～250℃
Within 10sec.
Within 3sec.
Preheating
120sec. Min.
200
120sec. Min.
200
Slow
cooling
Slow cooling
Preheating
150℃
100
100
0
0
Caution
①Wave soldering must not be applied to capacitors designated as for reflow soldering only.
［Hand soldering］
【Recommended conditions for eutectic soldering】
【Recommended condition for Pb-free soldering】
400
400
300
200
100
0
400
300
200
100
0
Peak 350℃ Max.
Peak 280℃ Max.
230～280℃
Within 3 sec.
300
Within 3sec.
Within 3sec.
⊿T
Slow cooling
Slow cooling
⊿T
200
Slow cooling
Preheating
150℃ Min.
Preheating
150℃ Min.
100
Preheating
60sec. Min.
60sec. Min.
60sec. Min.
0
⊿T
⊿T≦150℃
⊿T
⊿T≦130℃
316type or less
325type or more
Caution
①Use a 50W soldering iron with a maximum tip diameter of 1.0 mm.
②The soldering iron shall not directly touch capacitors.
＊This catalog contains the typical specification only due to the limitation of space. When you consider the purchase of our products, please check our specification.
For details of each product (characteristics graph, reliability information, precautions for use, and so on), see our Web site (http://www.ty-top.com/) or CD catalogs.
mlcc_prec_e-01
mlcc_prec-P3
TAIYO YUDEN [ TAIYO YUDEN (U.S.A.), INC ]
