Metallized Polypropylene Film EMI Suppression Capacitors
R47 Series, Class X1, 440 VAC, 110ºC (Automotive Grade)
Soldering Process
The implementation of the RoHS directive has resulted in the selection of SnAgCu (SAC) alloys or SnCu alloys as primary solder. This has
increased the liquidus temperature from that of 183ºC for SnPb eutectic alloy to 217 – 221ºC for the new alloys. As a result, the heat stress
to the components, even in wave soldering, has increased considerably due to higher pre-heat and wave temperatures. Polypropylene
capacitors are especially sensitive to heat (the melting point of polypropylene is 160 – 170ºC). Wave soldering can be destructive, especially
for mechanically small polypropylene capacitors (with lead spacing of 5 mm to 15 mm), and great care has to be taken during soldering. The
recommended solder profiles from KEMET should be used. Please consult KEMET with any questions. In general, the wave soldering curve
from IEC Publication 61760-1 Edition 2 serves as a solid guideline for successful soldering. Please see Figure 1.
Reflow soldering is not recommended for through-hole film capacitors. Exposing capacitors to a soldering profile in excess of the above the
recommended limits may result to degradation or permanent damage to the capacitors.
Do not place the polypropylene capacitor through an adhesive curing oven to cure resin for surface mount components. Insert through-
hole parts after the curing of surface mount parts. Consult KEMET to discuss the actual temperature profile in the oven, if through-hole
components must pass through the adhesive curing process. A maximum two soldering cycles is recommended. Please allow time for the
capacitor surface temperature to return to a normal temperature before the second soldering cycle.
Manual Soldering Recommendations
Following is the recommendation for manual
soldering with a soldering iron.
Temperature (°C)
Recommended Soldering Temperature
400
Wave Soldering Recommendations
300
260°C
2+3s max
250
First wave
Second wave
200
ΔT
<150°C
Cooling
ca 2°C/s
ca 3.5°C/s typical
Soldering iron bit temperature (deg C)
350
150
Preheating
300
250
100
T
preheat
115°C max
ca 5°C/s
100°C
Typical
200
50
150
100
0
0
40
80
120
160
200
240
50
Time (s)
0
1
2
3
4
5
6
7
8
0
Soldering time (sec)
The soldering iron tip temperature should be set
at 350°C (+10°C maximum) with the soldering
duration not to exceed more than 3 seconds.
© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 (864) 963-6300 • www.kemet.com
F3097_R47_X1_440 • 6/9/2016
8
KEMET [ KEMET CORPORATION ]
