Datasheet

6© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard F3016_PME271Y_Y2_250 • 3/12/2019
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Film Capacitors – AC Line EMI Suppression and RC Networks
PME271Y, Metallized Impregnated Paper, Class Y2, 250 VAC
Soldering Process
The implementation of the RoHS directive has resulted in the selection of SnAuCu (SAC) alloys or SnCu alloys as a primary solder.
Thishasincreasedtheliquidustemperaturefrom183°CforSnPbeutecticalloyto217–221°C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–170°C).Wavesolderingcan
be destructive, especially for mechanically small polypropylene capacitors (with lead spacing of 5 – 15 mm). Great care must be
takenduringsoldering.TherecommendedsolderprolesfromKEMETshouldbeused.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.
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.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 of two soldering cycles is recommended.
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.
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 (s)
ca 2°C/second
ca 3.5°C/second typical
ca 5°C/second
Cooling
2 +3 seconds maximum
115 °C max
T
preheat
∆T < 150°C
100 °C
Preheating
Typical
First wave
Second wave
260°C