KEMET R58 – X1 Film Capacitors for Demanding High-Voltage Applications
600 VAC, 1,200 VDC, and THB Grade IIIB: KEMET's R58 series combines high voltage capability with excellent humidity resistance and AEC-Q200 automotive qualification. An ideal solution for demanding EMI suppression applications in industrial electronics, solar energy systems, and electric mobility.
High Voltages, Harsh Environments – Reliable Performance
As power electronics continue to evolve, the requirements for electromagnetic interference (EMI) suppression are becoming increasingly demanding. High operating voltages, temperature fluctuations, and humidity place significant stress on electronic components.
With its R58 series, KEMET, part of the YAGEO Group, offers metallized polypropylene film capacitors featuring X1 safety classification according to IEC 60384-14.
Designed for operating voltages of 600 VAC (50/60 Hz) or 1,200 VDC, these capacitors provide a reliable solution for applications requiring high electrical performance and long-term stability.
Typical applications include EMI suppression in industrial equipment, output filtering in solar inverters, and high-voltage DC bus filtering in electric vehicles.
THB Grade IIIB – Reliability Under High Humidity
One of the key advantages of the R58 series is its qualification according to THB Grade IIIB (Temperature, Humidity, Bias).
The capacitors are tested under demanding environmental conditions:
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85°C ambient temperature
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85% relative humidity
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1,000 hours of testing
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600 VAC or 1,200 VDC applied voltage
This qualification is particularly important for applications exposed to elevated temperatures and high humidity over extended periods.
Additionally, the R58 series features the self-healing properties of metallized polypropylene film technology, while its flame-retardant enclosure meets UL 94 V-0 requirements.
Qualified for Automotive Applications
The R58 series meets the requirements of AEC-Q200, the automotive qualification standard for passive electronic components.
This makes the capacitors suitable for demanding automotive applications, including EMI filtering in high-voltage DC systems used in electric vehicles.
Key Technical Specifications
| Parameter | KEMET R58 |
|---|---|
| Technology | Metallized polypropylene film |
| Safety classification | X1 according to IEC 60384-14 |
| Rated AC voltage | 600 VAC |
| Rated DC voltage | 1,200 VDC |
| Capacitance range | 10 nF to 8.2 µF |
| Operating temperature | −40°C to +110°C |
| Humidity resistance | THB Grade IIIB |
| Automotive qualification | AEC-Q200 |
| Lead spacing | 15 to 52.5 mm |
| Capacitance tolerance | ±10% / ±20% |
| Self-healing properties | Yes |
| Environmental compliance | RoHS compliant, low halogen content |
Conclusion: Greater Design Flexibility for Demanding EMI Applications
The KEMET R58 series combines high AC and DC voltage ratings with excellent resistance to temperature and humidity stress.
Whether used in modern solar inverters, industrial power electronics, or automotive high-voltage systems, these capacitors provide a robust solution for reliable EMI filtering.
Are you developing an application with demanding requirements for voltage capability, temperature resistance, or humidity performance?
The engineering team at wittig ELECTRONIC can support you in selecting the right film capacitors and optimizing your component design.
Contact us – let's find the right solution for your application.