Datasheet

The top of the solder fillet should be lower than the
thickness of components. If the solder amount is
excessively large, the risk of cracking is higher during
board bending or under any other stressful conditions.
Continued from the preceding page.
Optimum Solder Amount for Flow Soldering
5. Flow Soldering
When components are exposed to sudden heat, their
mechanical strength can be decreased due to the
extreme temperature changes which can cause flexing
and result in internal mechanical damage, which will
cause the parts to fail. Additionally, an excessively long
soldering time or high soldering temperature results in
leaching by the outer electrodes, causing poor adhesion
or a reduction in capacitance value due to loss of contact
between electrodes and end termination.
In order to prevent mechanical damage, preheating is
required for both the components and the PCB board.
Preheating conditions are shown in Table 2. It is required
to keep temperature differential between the soldering
and the components surface (∆T) as small as possible.
When components are immersed in solvent after
mounting, be sure to maintain the temperature difference
between the component and solvent within the range
shown in Table 2.
Do not apply flow soldering to chips not listed in Table 2.
G--18/21/31
∆TV150D
Part Number
Temperature Differential
Table 2
[Standard Conditions for Flow Soldering]
[Allowable Soldering Temperature and Time]
In the case of repeated soldering, the accumulated
soldering time must be within the range shown above.
Soldering Time (sec.)
260
270
250
240
230
0102030
Soldering Temperature (D)
Up to Chip Thickness
Adhesive
Recommended Conditions
Peak Temperature
Atmosphere
Pb-Sn Solder
240-250°C
Air
Lead Free Solder
250-260°C
N
2
60-120 seconds 5 seconds max.
∆T
Gradual
Cooling
Soldering
Preheating
170°C
150°C
130°C
Time
Temperature (D)
Peak Temperature
Pb-Sn Solder: Sn-37Pb
Lead Free Solder: Sn-3.0Ag-0.5Cu
Continued on the following page.
in section
!Caution
212
!Note
• Please read rating and !CAUTION (for storage, operating, rating, soldering, mounting and handling) in this catalog to prevent smoking and/or burning, etc.
• This catalog has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering.
For General Purpose
GRM/GRJ Series
Only for ApplicationsAC250V Type
GA2 Series
Safety Standard
Certified GA3 Series
Product Information
!Caution
• This PDF catalog is downloaded from the website of Murata Manufacturing co., ltd. Therefore, it’s specifications are subject to change or our products in it may be discontinued without advance notice. Please check with our
sales representatives or product engineers before ordering.
• This PDF catalog has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering.
!Note
C02E.pdf
10.12.20