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Technical Information:
Basic Technical Data for Capacitors
Construction of Plastic Film Capacitors 
Dielectric 
Special Technical Subjects 


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Characteristics of Metallized Film Capacitors
in Comparison with Other Dielectrics

  PET PP PPS NPO X7R Tantalum
Dielectric constant
1 kHz/23°C
3.3 (positive as temperature rise) 2.2 (negative as temperature rise) 3.0 (very constant versus temperature) 12...40 700...2000 26

Operating temperature

(°C)

_55...+105 _55...+100 _55...+140 _55...+125 _55...+125 _55...+125
Dielectric absorption
(%)
0.2...0.25 0.05...0.10 0.05 0.6 2.5 n.a.
C/C versus temperature (%) ± 5 ± 2.5 ± 1.5 ± 0.3 ± 15 ± 10
C/C versus voltage (%) negligible negligible negligible negligible -20 negligible
C aging rate (%/h decreasing) negligible negligible negligible negligible 2 n.a.
Dissipation factor (%)
1 kHz
10 kHz
100 kHz
0.8
1.5
3.0
0.05
0.08
0.25
0.2
0.25
0.5
0.10
0.10
0.10

2.5

 

8

 

ESR low very low very low low moderate high
Ris (M x µF)
25 °C
85 °C
10000
1000
100000
10000
10000
1000
10000
1000
1000
500
100
10
Capacitance range from pF to µF 1000...220 27...100 10000...6.8 1...0.1 100...2.2 100000...1000
Capacitance tolerance
(+/- %)
5/10/20 1/2.5/5/10 2.5/5/10/20 5/10 10/20 10/20
Self-healing yes yes yes no no no
Typical failure mode at end of life open open open short short short
Reliability high high high high moderate low
Piezoelectric effect no no no no yes yes
Resistance to thermal and mechanical shock high high high moderate to low moderate to low high
Polarity no no no no no yes