Datasheet

12© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard F3116_C4AF • 7/29/2020
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Power and AC Film Capacitors – Printed Circuit Board Mount Power Film Capacitors
C4AF, Radial, 2 or 4 Leads, 250 - 500 VAC, for Harsh Environment AC Filtering (Automotive Grade)
Soldering Process
The implementation of the RoHS directive has resulted in the selection of SnAuCu (SAC) alloys, or SnCu alloys, as the primary
solder material. This has increased the liquidus temperature from 183°C for a SnPb eutectic alloy to 217 – 221°C for 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 – 170°C).
Wave soldering can be destructive, especially for mechanically small polypropylene capacitors (with lead spacing of 5 – 15 mm),
and great care must be taken during soldering. The recommended solder proles from KEMET should be used. Contact 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. 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
recommended limits may result in 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 curing the surface mount parts. Contact 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.
Allow time for the capacitor surface temperature to return to normal before the second soldering cycle.
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 (seconds)
Soldering Iron Bit Temperature (°C)
Wave Soldering Recommendations
0
50
100
150
200
250
300
0 40 80 120 160 200 240
Temperature (°C)
Time (seconds)
Cooling
2+3 seconds max
260°C
First Wave
Second Wave
∆ T <
150°C
ca. 2°C/second
ca. 3.5°C/second
typical
Preheating
T
preheat
Typical