Datasheet

© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 [phone] • www.kemet.com F3030_R71 • 10/30/2015 13
Film Capacitors
Polypropylene Pulse/High Frequency Capacitors – R71 Series Single Metallized Polypropylene Film, Radial, SMPS PFC Applications
Soldering Process cont'd
Wave Soldering Recommendations cont'd
1. The table indicates the maximum set-up temperature of the soldering process
Figure 1
Dielectric
Film Material
Maximum Preheat
Temperature
Maximum
Peak Soldering
Temperature
Capacitor
Pitch
≤10mm
Capacitor
Pitch
= 15 mm
Capacitor
Pitch
> 15 mm
Capacitor
Pitch
≤15mm
Capacitor
Pitch
> 15 mm
Polyester 130°C 130°C 130°C 270°C 270°C
Polypropylene 100°C 110°C 130°C 260°C 270°C
Paper 130°C 130°C 140°C 270°C 270°C
Polyphenylene
Sulphide
150°C 150°C 160°C 270°C 270°C
2. The maximum temperature measured inside the capacitor:
Set the temperature so that inside the element the maximum temperature is below the limit:
Dielectric Film Material
Maximum temperature
measured inside the element
Polyester 160°C
Polypropylene 110°C
Paper 160°C
Polyphenylene
sulphide
160°C
Temperature monitored inside the capacitor.
Selective Soldering Recommendations
Selectivedipsolderingisavariationofreowsoldering.Inthismethod,theprintedcircuitboardwiththrough-holecomponentstobe
solderedispreheatedandtransportedoverthesolderbathasinnormalowsolderingwithouttouchingthesolder.Whentheboardis
over the bath, it is stopped and pre-designed solder pots are lifted from the bath with molten solder only at the places of the selected
components, and pressed against the lower surface of the board to solder the components.
Thetemperatureproleforselectivesolderingissimilartothedoublewaveowsolderingoutlinedinthisdocument,however, instead
of two baths, there is only one bath with a time from 3 to 10 seconds. In selective soldering, the risk of overheating is greater than
indoublewaveowsoldering,andgreatcaremustbetakensothatthepartsarenotoverheated.