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4-1.Reflow Soldering
1. When sudden heat is applied to the components, the
mechanical strength of the components will decrease
because a sudden temperature change causes
deformation inside the components. In order to prevent
mechanical damage to the components, preheating is
required for both the components and the PCB.
Preheating conditions are shown in table 1. It is required to
keep the temperature differential between the solder and
the components surface (ΔT) as small as possible.
2. Solderability of tin plating termination chips might be
deteriorated when a low temperature soldering profile where
the peak solder temperature is below the melting point of
tin is used. Please confirm the solderability of tin plated
termination chips before use.
3. When components are immersed in solvent after mounting,
be sure to maintain the temperature difference (ΔT)
between the component and the solvent within the range
shown in the table 1.
Table 1
Chip Dimension(L/W) Code
Series
GJM
Recommended Conditions
Peak Temperature
Atmosphere
Lead Free Solder: Sn-3.0Ag-0.5Cu
4. Optimum Solder Amount for Reflow Soldering
4-1. Overly thick application of solder paste results in a excessive solder fillet height.
This makes the chip more susceptible to mechanical and thermal stress on the board and may cause the chips to crack.
4-2. Too little solder paste results in a lack of adhesive strength on the termination, which may result in chips breaking loose
from the PCB.
4-3. Please confirm that solder has been applied smoothly to the termination.
Inverting the PCB
Make sure not to impose any abnormal mechanical shocks to the PCB.
JEMCGC-2703M
Temperature Differential
02/03/15
Lead Free Solder
240 to 260℃
Air or N
2
[Standard Conditions for Reflow Soldering]
Temperature(℃)
Peak Temperature
220℃
190℃
170℃
150℃
[Allowable Reflow Soldering Temperature and Time]
ΔT≦190℃
In the case of repeated soldering, the accumulated
soldering time must be within the range shown above.
14
Soldering
ΔT
Preheating
60-120 seconds
30-60 seconds
280
270
260
250
240
230
220
0
30
60
Soldering Time(s)
!
Caution
Gradual
Cooling
Time
90
120
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