YAGEO Group has introduced the R41D V234 Series, a new high-current Y2/X1 metallized polypropylene film capacitor family aimed at EMI suppression in modern wide-bandgap power converters using SiC and GaN devices.
The YAGEO film capacitor series builds on the established R41D platform but adds significantly higher ripple current capability, allowing designers to handle fast switching edges and higher transient currents while reducing capacitor count in EMI filters.
Key features and benefits
- Safety‑class EMI suppression capacitor: Y2/X1 classification for use directly on the AC line in EMI filters, supporting line‑to‑ground and line‑to‑line positions where safety approvals are mandatory.
- Optimized for wide‑bandgap power stages: High dV/dt capability (up to 6000 V/µs depending on lead pitch) enables robust operation with fast SiC and GaN switching edges without excessive capacitor stress.
- High ripple current capability: The V234 c‑spec option offers approximately double Irms compared with standard designs, allowing fewer capacitors in parallel for the same ripple current handling.
- Compact radial package: Capacitance range from 0.001 µF to 0.22 µF at 300 VAC in radial, through‑hole packages, supporting efficient board layout in dense power electronics.
- Extended reliability: High Temperature Bias (THB) performance, endurance in hot and humid environments, and a maximum operating temperature of 125 °C (for 2 000 hours) to support long field lifetimes.
- Global approvals and automotive readiness: ENEC, UL, cUL, CQC approvals, compliance with RoHS/REACH/halogen‑free requirements, and AEC‑Q200 compliant construction for both automotive and industrial deployments.
Typical applications
The R41D V234 safety capacitor series targets EMI suppression stages in advanced power conversion systems, particularly where wide‑bandgap devices push switching frequencies and dV/dt beyond legacy capacitor capabilities.
Typical use cases include:
- On‑board chargers in electric vehicles (OBC), in both AC input Y2/X1 positions and DC‑side EMI filters.
- DC/DC converters in automotive and industrial systems, especially those based on SiC or GaN switches.
- Solar inverters and energy storage systems, where high‑efficiency PFC and DC link stages require robust EMI suppression.
- EV charging stations (AC and DC), including high‑power public chargers with three‑phase inputs.
- Three‑phase UPS systems and other critical power backup equipment.
- HVDC filters and general AC input EMI filtering in high‑performance power supplies.
In many of these applications, the higher Irms capability can enable designers to consolidate several smaller capacitors into a single R41D V234 device, simplifying layout and potentially improving reliability by reducing the number of solder joints.
Technical highlights
Core electrical parameters
- Capacitance range: 0.001 µF to 0.22 µF.
- Rated AC voltage: 300 VAC, 50/60 Hz (Y2/X1 safety class).
- Recommended DC voltage: 1200 VDC for DC applications and DC‑biased EMI nodes.
- High dV/dt capability:
- 6000 V/µs at 10 mm lead pitch.
- 4500 V/µs at 15 mm lead pitch.
- 3000 V/µs at 22.5 mm lead pitch.
- High Irms capability with V234 c‑spec: up to around two times the ripple current of standard R41D‑class designs (exact values according to the manufacturer datasheet for each part number).
A high dV/dt rating indicates that the capacitor can withstand very steep voltage edges without internal failures such as partial discharges or excessive heating, which is critical in SiC/GaN converters where switching slopes are much faster than in traditional silicon MOSFET or IGBT designs. The enhanced Irms rating reflects the ability to dissipate higher ripple current without exceeding thermal limits.
Reliability and environmental performance
- High Temperature Bias (THB) grade performance at both AC and DC voltages.
- Specified endurance tests in hot and humid conditions, for example at 85 °C/85% RH and elevated voltages over hundreds to thousands of hours, according to the series catalogue.
- Maximum operating temperature: up to 125 °C for 2 000 hours.
- Designed for long operational lifetime in both AC and DC applications, including harsh ambient conditions.
These characteristics are important in applications such as under‑hood automotive units, outdoor EV chargers, or solar inverters, where capacitors must withstand wide temperature swings and humidity over many years.
Compliance and safety
- Safety approvals: ENEC, UL, cUL, CQC for Y2/X1 configurations.
- AEC‑Q200 compliant, supporting use in automotive systems.
- RoHS, REACH, and halogen‑free compliant materials for environmental regulatory alignment.
Selected parameter overview
Below is a concise summary of the key series‑level parameters. For exact ratings and tolerances, engineers should refer to the official series datasheet.
| Parameter | R41D V234 Series value / note |
|---|---|
| Capacitance range | 0.001 µF to 0.22 µF |
| AC rated voltage | 300 VAC, 50/60 Hz |
| Recommended DC voltage | 1200 VDC |
| Safety class | Y2 / X1 |
| dV/dt capability | 6000 / 4500 / 3000 V/µs (10 / 15 / 22.5 mm lead pitch) |
| Max operating temperature | 125 °C (2 000 hours) |
| Ripple current (Irms) | Up to ~2× standard designs (V234 c‑spec; per datasheet) |
| Approvals | ENEC, UL, cUL, CQC |
| Automotive qualification | AEC‑Q200 compliant |
Design‑in notes for engineers
Selecting the right R41D V234 capacitor
- Match dV/dt to switch technology: In fast SiC or GaN stages, choose lead spacing and dV/dt capability with margin above the worst‑case switching slopes, including overshoot and ringing, to reduce stress and increase lifetime.
- Size for ripple current, not only capacitance: Treat Irms as a primary dimensioning parameter in EMI filters. Use the V234 Irms ratings to minimize the number of parallel capacitors while keeping self‑heating within acceptable limits.
- Consider thermal environment: In hot ambient or enclosed designs, derate ripple current to account for reduced cooling. The 125 °C capability offers headroom, but local board temperature and airflow still matter.
- Verify safety spacing and creepage: Select the appropriate lead pitch and case size to meet insulation coordination requirements for Y2/X1 capacitors at the actual system voltage and pollution degree.
- Check THB and humidity robustness: For outdoor or high‑humidity systems (EV charging, solar, grid‑tied storage), leverage the THB grade performance and use the datasheet test conditions as guidance for expected field robustness.
- Automotive considerations: For automotive OBC and DC/DC converters, confirm AEC‑Q200 status for the specific part number and include the capacitor in your system‑level environmental and vibration qualification plan.
Circuit‑level integration hints
- In AC input EMI filters, place the R41D V234 device at the Y or X1 positions where high dV/dt across the capacitor is expected due to common‑mode chokes and fast rectifier or converter stages.
- When replacing multi‑capacitor banks, verify that the single R41D V234 part meets both EMI attenuation and thermal limits across the full operating range.
- In three‑phase systems, coordinate selection across phases for symmetrical leakage current and consistent EMI performance.
- Consider using the YAGEO/KEMET simulation tools (such as Y‑SIM) to validate EMI performance and power loss when combining R41D V234 with other passives in the filter.
Source
This article is based on information provided by YAGEO Group in their official R41D V234 Series product brief and related product pages, with additional independent commentary and application context for design engineers.