Datasheet

© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 [phone] • www.kemet.com F3037_R73 • 5/15/2015 13
Film Capacitors – Polypropylene Pulse/High Frequency Capacitors
R73 Series Polypropylene Film/Foil, Radial (Automotive Grade)
Manual Soldering Recommendations
Following is the recommendation for manual
soldering with a soldering iron.
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.
Recommended Soldering Temperature
0
50
100
150
200
250
300
350
400
0 1 2 3 4 5 6 7 8
Soldering time (sec)
Soldering iron bit temperature (deg C)
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proles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.
Reowsolderingisnotrecommendedforthrough-holelmcapacitors.Exposingcapacitorstoasolderingprole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prole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.
Wave Soldering Recommendations
0
50
100
150
200
250
300
0
40
80
120
160
200
240
Temperature (°C)
Time (s)
ca 2°C/s
ca 3.5°C/s typical
ca 5°C/s
Cooling
2+3s max
115°C max
T
preh eat
ΔT <150°C
100°C
Preheating
Typical
First wave
Second wave
260°C