Murata Posistor PRG21BC MM1RK Series Manual page 6

(3) Allowable Soldering Temperature and Time
i. Solder within the temperature and time combinations, indicated by the slanted lines in the
following graphs.
ii. The excessive soldering conditions may cause dissolution of metallization or deterioration of
solder-wetting on the external electrode.
iii. In case of repeated soldering, the total accumulated soldering time should be within the range
shown below figure. (For example, Reflow peak temperature : 250℃, twice → The total
accumulated soldering time at 250℃ is within 20sec.)
<Allowable Reflow Soldering Temp. and Time>
270
260
250
240
230
220
210
200
0 10 20 30
Time (sec.)
(4) Standard Temperature Profile for Soldering
i. Insufficient preheating may cause a crack on ceramic body.
Difference between preheating temperature and maximum temperature in the profile shall be
100 °C.
ii. Rapid cooling by dipping in solvent or by other means is not recommended.
<Reflow Soldering Condition>
Preheating (in air)
200
100
0
1~2 min.
(5) There is a fear of unexpected failures (tombstone, insufficient solder-wetting, etc.) in your
mounting process, caused by the mounting conditions. Please evaluate if this product is
correctly mounted under your mounting conditions.
(6) Conditions with Soldering Iron
When hand soldering by iron is applied, be sure to keep following conditions.
Item
Preheating
Temperature of Iron-tip
Soldering Iron Wattage
Diameter of Iron-tip
Soldering Time
Solder
Flux
Caution
This information may be changed without a previous notice.
40 50 60
Gradual cooling
Soldering
(in air)
240°C
#
20sec.
at 150°C for 1 to 2 minute
3mm dia. max.
Use H60A (Sn:Pb=60:40wt%) type ,
H63A (Sn:Pb=63:37wt%) type
Do not use strong acidic flux (with halide content
exceeding 0.2wt%).
Do not allow the iron-tip to directly
touch the ceramic body.
Murata Manufacturing Co., Ltd.
Preheating: 150 +/- 10 °C
Soldering:
# In case of repeated soldering, the total
accumulated soldering time should be
within the range shown above figure (3).
Conditions
280°C max.
30W max.
10sec. max.
1min. to 2 min.
240 °C
20sec.
CE-025Q