YAGEO Group’s SCF‑X and SCT‑X single‑phase common mode chokes are EMI filter components for industrial power systems that must meet stringent EMC requirements without sacrificing efficiency or board space.
The YAGEO single‑phase common mode chokes combine a wide inductance and current range with two core material options, giving design engineers a single platform for both high‑performance and cost‑optimized conducted noise suppression in single‑phase AC and DC applications.
Key features and benefits
- Rated for industrial single-phase grids up to 500 VAC/VDC, suitable for typical mains‑connected power supplies, inverters and control systems in industrial environments.
- Current range from 1 A to 22 A, covering low‑power control electronics up to higher‑power single‑phase drives and conditioners.
- Very wide inductance range from 0.07 mH to 95.26 mH, allowing precise EMI tuning across low and higher frequency regions using standard parts rather than custom chokes.
- Two core material systems in one family: nanocrystalline SCF‑X for strong broadband attenuation; SCT‑X with high‑heat‑resistant Mn‑Zn ferrite (10HT) for cost‑effective, targeted noise suppression.
- Low DC resistance (0.64 mΩ to 65.26 mΩ) to minimize conduction losses and heat generation, which is critical in tightly packed power supplies and inverters.
- Operating temperature range from −40 °C to +130 °C, supporting continuous operation in harsh industrial environments, control cabinets and HVAC systems.
- Compact toroidal construction with UL 94 V‑0 rated base and cap, improving PCB integration, mechanical robustness and fire safety compliance.
- 116 part numbers across multiple core sizes (12, 17, 23 and 31 mm), giving purchasing and design teams a broad but coherent catalog for platform‑wide standardization.
Typical applications
The SCF‑X and SCT‑X single‑phase common mode chokes are positioned for conducted EMI suppression in industrial and building‑related power electronics where compliance with EMC standards and reliable long‑term operation are key.
Typical application areas include:
- Industrial equipment and factory automation controllers.
- Industrial inverters and single‑phase motor drives.
- Switched‑mode power supplies and power conditioners for machinery and tooling.
- Single‑phase power converters and front‑end EMI filters in rectifier stages.
- Air conditioning and HVAC systems with electronic control and variable‑speed compressors.
- Robotics and motion control systems requiring compact, high‑performance EMI filtering.
In practice, these chokes are used in common‑mode filter stages at the AC input or DC bus interface to suppress noise that couples symmetrically onto line and neutral, helping designs pass conducted emission tests without large external filters or custom magnetics.
Technical highlights
Electrical ratings and ranges
- Rated voltage: up to 500 VAC/VDC.
- Rated current range: 1 A to 22 A.
- Inductance range: 0.07 mH to 95.26 mH.
- DC resistance (DCR): 0.64 mΩ to 65.26 mΩ.
- Operating temperature range: −40 °C to +130 °C.
These ranges make the family suitable for single‑phase mains levels used in many industrial regions and allow scaling from small loads to larger single‑phase equipment without changing platform or layout.
Core materials and construction
- SCF‑X: nanocrystalline core technology for strong broadband EMI suppression across a wide frequency spectrum, beneficial when conducted noise spans from tens of kilohertz into the megahertz region.
- SCT‑X: proprietary 10HT Mn‑Zn ferrite core material with high heat resistance and high saturation flux density (Bs), optimized for cost‑effective suppression in defined frequency bands and elevated temperature environments.
- Toroidal construction: compact footprint, low stray fields and straightforward integration into PCB or chassis‑mounted EMI filters.
- UL 94 V‑0 rated base and cap: supports safety compliance and reduces risk in fire‑critical or safety‑relevant designs.
Platform overview
| Parameter | SCF‑X / SCT‑X family |
|---|---|
| Voltage rating | Up to 500 VAC/VDC |
| Current range | 1 A – 22 A |
| Inductance range | 0.07 mH – 95.26 mH |
| DCR range | 0.64 mΩ – 65.26 mΩ |
| Operating temperature | −40 °C to +130 °C |
| Core sizes | 12 mm, 17 mm, 23 mm, 31 mm |
| Number of part numbers | 116 |
| Core materials | Nanocrystalline (SCF‑X), high‑heat Mn‑Zn ferrite 10HT (SCT‑X) |
For detailed per‑part ratings, engineers should refer directly to the manufacturer’s product brief and datasheet information according to the manufacturer datasheet.
Design‑in notes for engineers
- Select material based on EMI profile and cost targets
- Use SCF‑X nanocrystalline variants when broadband EMI suppression is required, especially in designs with wideband switching spectra or aggressive switching edge rates.
- Prefer SCT‑X ferrite variants when noise appears in narrower bands or when cost optimization is a priority, leveraging the high‑heat‑resistant 10HT ferrite and high Bs.
- Match inductance and current to the line conditions
- Start from the grid voltage (up to 500 VAC/VDC), nominal current and expected switching frequency to identify the required inductance value that meets conducted emission limits.
- Ensure that the selected choke’s current rating and temperature range provide adequate margin under worst‑case load and ambient temperatures.
- Consider DCR and thermal behavior early in the design
- Low DCR values help reduce power loss and self‑heating; however, verify that total losses remain acceptable at maximum current, especially in sealed or high‑density enclosures.
- The −40 °C to +130 °C operating range supports many industrial environments, but layout, airflow and nearby heat sources should be considered in the thermal model.
- Use platform consistency to simplify layout and variants
- With multiple core sizes and shared footprint approaches, the SCF‑X and SCT‑X series allow one PCB design to support several power levels by populating different part numbers.
- This platform approach reduces re‑layout effort when moving from performance‑driven to cost‑optimized variants or when scaling current capability within the same product family.
- Plan for EMC compliance and safety from the outset
- Place the common mode choke near the mains or single‑phase input and coordinate its use with line filters, X/Y capacitors and surge protection devices.
- Take advantage of the UL 94 V‑0 base and cap and toroidal construction when building safety‑critical filters for industrial drives, HVAC systems and robotics.
- Leverage standardization for purchasing and lifecycle management
- The broad but structured portfolio enables company‑wide preferred part lists and reduces the need for custom wound chokes.
- Working within a single, well‑documented series supports long‑term availability, easier second‑source evaluation and clearer communication between design and procurement teams.
Source
This article is based on information from the YAGEO Group manufacturer press release and associated official product documentation for the SCF‑X and SCT‑X single‑phase common mode chokes, with all specific ratings and ranges taken according to the manufacturer datasheet.
