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Substitution of Obsolete Polycarbonate (PC) Capacitors

After the discontinuation of Polycarbonate film (end of 2000) as a capacitor dielectric by the only manufacturer, Bayer AG/Germany, we have removed all MKC ranges (metallized capacitors) and FKC ranges (film and foil construction) using this capacitor film from our range of products latest after inventory of film has run out.
However, the question of which capacitors can be used to replace the PC series is still of interest. The following comparisons may be of assistance in making decisions.

The special feature of Polycarbonate (PC) capacitors is the almost constant course of capacitance drift versus temperature and the suitability for special applications in the field of higher frequencies respectively.

 
 
Capacitance change with temperature   Dissipation factor with frequency
 
 
Substitution by Polyester (PET) Capacitors
 
 
Results: In the field of normal application temperature 0/+20 to +80°C Polyester (PET) shows a comparable linearity of the capacitance course in the positive field in comparison with Polycarbonate (PC) which shows a slightly negative course. The capacitance inconstancy versus time is basically identical with both dielectrics.
Capacitance change with temperature    
 

Substitution suggestions for metallized capacitors:

 
Obsolete WIMA type PCM Suggested WIMA type PCM Replace also obsolete competitor series
WIMA MKC 02 2.5 WIMA MKS 02 2.5  
WIMA MKC 2 5 WIMA MKS 2 5 MKC 1858 / CMK
WIMA MKC 3 7.5 WIMA MKS 4 7.5 CMK
WIMA MKC 4 >10 WIMA MKS 4 >10 MKC 1862 / MKC 344 / CMK
 
Substitution suggestions for film/foil capacitors:
 
Obsolete WIMA type PCM Suggested WIMA type PCM Replace also obsolete competitor series
WIMA FKC 2 5 WIMA FKS 2 5 KC 1850 / CFR (CMK)
WIMA FKC 3 >7.5 WIMA FKS 3 >7.5 CMK
 
Note: size comparisons between series are possible for the most parts.
 
 
Substitution by Polypropylene (PP) Capacitors
 
 
Capacitance change with temperature   Dissipation factor with frequency
     
Results: in comparison to Polycarbonate (PC), Polypropylene (PP) has a lower dissipation factor throughout the course of the whole temperature field.
 
Substitution suggestions for metallized capacitors:
 
Obsolete WIMA type PCM Suggested WIMA type PCM Replace also obsolete competitor series
WIMA MKC 2 5 WIMA MKP 2 5 MKC 1858 / CMK
WIMA MKC 3 7.5 WIMA MKP 4 7.5 CMK
WIMA MKC 4 >10 WIMA MKP 4 >10 MKC 1862 / MKC 344 / CMK
WIMA MKC 10 >7.5 WIMA MKP 10 >7.5  
 
Substitution suggestions for film/foil capacitors:
 
Obsolete WIMA type PCM Suggested WIMA type PCM Replace also obsolete competitor series
WIMA FKC 02 2.5 WIMA FKP 02 2.5  
WIMA FKC 2 5 WIMA FKP 2 5 KC 1850 / CFR (CMK)
WIMA FKC 3 >7.5 WIMA FKP 3 >7.5 CMK
 
Note: size comparisons between series are possible for the most parts.