Film Capacitors – Made in Germany
SMD-PET
Characteristics of WIMA SMD Capacitors in Comparison with other Dielectrics
Capacitance change versus temperature (f =1 kHz) (general guide)
Insulation resistance change versus temperature (general guide)
Dissipation factor change versus temperature (f =1 kHz) (general guide)
Capacitance change versus voltage (general guide)
Characteristics of Metallized Film Capacitors in Comparison with Other Dielectrics
| PET | PP | PEN | PPS | NPO | X7R | Tantal | |
| Dielectric constant 1 kHz/23°C |
3.3 positive as temperature rise | 2.2 negative as temperature rise | 3.0 positive as temperature rise | 3.0 very constant versus temperature | 12...40 | 700...2000 | 26 |
| Operating temperature (°C) | -55...+105 (+125) | -55...+100 (+105) | -55...+125 | -55...+140 | -55...+125 | -55...+125 | -55...+125 |
| Dielectric absorption (%) | 0.2...0.25 | 0.05...0.10 | 1.0 | 0.05 | 0.6 | 2.5 | n.a. |
| ΔC/C versus temperature (%) | ± 5 | ± 2.5 | ± 5 | ± 1.5 | ± 0.3 | ± 15 | ± 10 |
| ΔC/C versus voltage (%) | negligible | negligible | negligible | negligible | negligible | -20 | negligible |
| ΔC aging rate (%/h decreasing) | negligible | 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 |
0.8 1.5 3.0 |
0.2 0.25 0.5 |
0.10 0.10 0.10 |
2.5 - - |
8 - - |
| ESR | low | very low | low | very low | low | moderate | high |
| Ris (MΩ x µF) 25 °C 85 °C |
10000 1000 |
100000 10000 |
10000 1000 |
10000 1000 |
10000 1000 |
1000 500 |
100 10 |
| Capacitance range from pF to µF | 1000...680 | 27...400 | 10000...1.0 | 10000...2.2 | 1...0.1 | 100...2.2 | 100000...1000 |
| Capacitance tolerance (+/- %) | 5/10/20 | 1/2.5/5/10 | 5/10/20 | 2.5/5/10/20 | 5/10 | 10/20 | 10/20 |
| Self-healing | yes | yes | yes | yes | no | no | no |
| Typical failure mode at end of life | open | open | open | open | short | short | short |
| Reliability | high | high | high | high | high | moderate | low |
| Piezoelectric effect | no | no | no | no | no | yes | yes |
| Resistance to thermal and mechanical shock | high | high | high | high | moderate to low | moderate to low | high |
| Polarity | no | no | no | no | no | no | yes |