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A72F01002600M

Polypropylene Pulse/High Frequency Capacitors A72 Series Polypropylene Film/Foil, Axial

KEMET 

Film Capacitors

Polypropylene Pulse/High Frequency Capacitors – A72 Series Polypropylene Film/Foil, Axial

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.

Wave Soldering Recommendations

300

260°C

250

First wave

200

ΔT <150°C

Preheating

150

2+3s max

Second wave

100

Tp reh eat

115°C max

100°C

Typical

50

Cooling

ca 2°C/s

ca 3.5°C/s typical

ca 5°C/s

0

0

40

80

120

160

200

240

Time (s)

Manual Soldering Recommendations

Following is the recommendation for manual soldering with a

soldering iron.

Recommended Soldering Temperature

400

Do not place the polypropylene capacitor through an adhesive

350

curing oven to cure resin for surface mount components. Insert

through- hole parts after the curing of surface mount parts. Consult

300

KEMET to discuss the actual temperature profile in the oven, if

250

through-hole components must pass through the adhesive curing

200

process. A maximum two soldering cycles is recommended. Please

150

allow time for the capacitor surface temperature to return to a

100

normal temperature before the second soldering cycle.

50

Figure 1

0

0

1

2

3

4

5

6

7

8

Soldering time (sec)

Dielectric

Film Material

Maximum Preheat

Temperature

Capacitor

Lead

Spacing

<10 mm

Capacitor

Lead

Spacing =

15 mm

Capacitor

Lead

Spacing

>15 mm

Maximum

Peak Soldering

Temperature

Capacitor Capacitor

Lead

Lead

Spacing Spacing

<15 mm >15 mm

Polyester

130°C 130°C 130°C 270°C 270°C

Polypropylene 100°C 110°C 130°C 260°C 270°C

Polyphenylene

Sulphide

150°C

150°C

160°C

270°C

270°C

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

F3039_A72_AXIAL • 12/15/2014 8

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