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
recommendedꢀsolderꢀprofilesꢀfromꢀKEMETꢀshouldꢀbeꢀused.ꢀPleaseꢀconsultꢀKEMETꢀwithꢀanyꢀquestions.ꢀInꢀgeneral,ꢀtheꢀwaveꢀsolderingꢀcurveꢀ
from IEC Publication 61760-1 Edition 2 serves as a solid guideline for successful soldering. Please see Figure 1.
Reflowꢀsolderingꢀisꢀnotꢀrecommendedꢀforꢀthrough-holeꢀfilmꢀcapacitors.ꢀExposingꢀcapacitorsꢀtoꢀaꢀsolderingꢀprofileꢀinꢀexcessꢀofꢀtheꢀaboveꢀtheꢀ
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-
holeꢀpartsꢀafterꢀtheꢀcuringꢀofꢀsurfaceꢀmountꢀparts.ꢀConsultꢀKEMETꢀtoꢀdiscussꢀtheꢀactualꢀtemperatureꢀprofileꢀinꢀtheꢀoven,ꢀifꢀthrough-holeꢀ
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
Wave Soldering Recommendations
300
Following is the recommendation for manual
soldering with a soldering iron.
2+3s max
260°C
250
200
150
100
50
Firstwave
Second wave
Recommended Soldering Temperature
ΔT <150°C
Cooling
400
Preheating
ca 2°C/s
350
300
250
200
150
100
50
ca 3.5°C/s typical
ca 5°C/s
115°C max
Tpreheat
100°C
Typical
0
0
40
80
120
160
200
240
Time (s)
0
0
1
2
3
4
5
6
7
8
Soldering time (sec)
The soldering iron tip temperature should be set
atꢀ350°Cꢀ(+10°Cꢀmaximum)ꢀwithꢀtheꢀsolderingꢀ
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 ]
