In switching power supplies, DC-DC converters, and EMI filtering circuits, power inductors directly affect system efficiency, electromagnetic compatibility, and reliability. Traditional drum cores use an open magnetic circuit with relatively high leakage flux, which can easily interfere with nearby sensitive circuits and increase EMC design difficulty. At the same time, high-current applications place higher demands on the inductor's current carrying capability and thermal stability. SHINHOM Toroidal Chokes achieve extremely low leakage flux and low EMI radiation, providing a high-performance power inductor solution for high-density electronic systems.
Core Technology 1: Closed Magnetic Circuit Design – Extremely Low Leakage Flux, Reduced EMI Interference
Technical Description
- The toroidal core forms a closed magnetic circuit, with magnetic flux almost entirely confined within the core
- Compared to the open magnetic circuit of traditional drum cores, leakage flux is significantly reduced
Engineering Value
- Reduces interference with nearby sensitive circuits (such as RF, sensors, and high-speed signal lines)
- Lowers system-level EMC design difficulty
- Suitable for high-density PCB layouts, where inductors are less likely to produce magnetic coupling between each other
Applicable Scenarios
- EMI filtering circuits
- Switching power supplies (SMPS)
- DC-DC converters
Core Technology 2: Low EMI Radiation – Excellent Electromagnetic Compatibility
Technical Description
- The closed magnetic circuit suppresses magnetic flux leakage at the source
- Low EMI radiation characteristics
Engineering Value
- Helps systems pass EMI compliance certification more easily
- Reduces the need for additional shielding measures
- Improves overall electromagnetic compatibility of the equipment
Applicable Scenarios
- EMI-sensitive communication equipment
- Medical electronic equipment
- Automotive electronic systems
Core Technology 3: High Current Carrying Capability – Up to 25.4A
Technical Description
- Leaded series supports currents up to 38.7A (TM series)
- SMD series supports currents up to 25.4A (STR8052 series)
Engineering Value
- Suitable for high-power DC-DC converters and switching power supplies
- Meets the high-current requirements of industrial equipment and communication power supplies
- Reduces the number of parallel inductors, simplifying circuit design
Applicable Scenarios
- High-power switching power supplies
- Industrial power modules
- Server power supplies
Core Technology 4: Wide Inductance Range and Multiple Package Options
Technical Description
- Inductance range: 0.47µH to 2200µH
- Package options: SMD and leaded types
- Operating temperature: -55°C to +125°C (leaded types up to 200°C)
Engineering Value
- Wide inductance range adapts to different filtering requirements
- SMD package is suitable for automated high-volume production and saves PCB space
- Leaded package is suitable for manual soldering and high-current applications
- Wide operating temperature range adapts to harsh environments
Applicable Scenarios
- Consumer electronics
- Industrial control
- Automotive electronics
Product Series Overview
| Package Type | Series | Inductance Range (µH) | Current Range (A) | Features |
|---|---|---|---|---|
| Leaded | ATC-TC | 40–470 | 0.5–3 | Low loss, general-purpose |
| Leaded | TM | 1.0–1000 | 1.6–38.7 | High current, high power |
| Leaded | TR | 10–1000 | 1.3–20.2 | General-purpose |
| Leaded | TR75 | 180–720 | - | Specific inductance range |
| Leaded | TS | 1.0–1000 | 1.5–34 | High current, low DCR |
| SMD | STC0718 | 0.42–100 | 0.24–3.0 | Miniaturised |
| SMD | STR | 1.1–2000 | 0.18–3.2 | Wide inductance range |
| SMD | STR30 | 1.8–390 | 0.6–12 | Medium current |
| SMD | STR38 | 1.5–470 | 0.74–18 | Higher current |
| SMD | STR44 | 5.6–2200 | 0.38–11 | High inductance |
| SMD | STR50 | 10–4700 | 0.31–9.0 | Ultra-high inductance |
| SMD | STR8052 | 1.0–1000 | 1.9–25.4 | Highest current |
| SMD | STRD | 0.88–77 | 1.1–22.4 | Low DCR |
| SMD | STR0918 | 0.47–47 | 0.43–3.0 | Compact size |
Other Technical Characteristics
| Feature | Description | Engineering Value |
|---|---|---|
| Low audible noise | Reduces coil buzzing | Improves user experience for audio equipment and home appliances |
| High magnetic efficiency | High inductance per unit volume | Suitable for high-density mounting |
| Soft saturation characteristic | Inductance gradually decreases as current increases | Requires design margin to avoid saturation |
| RoHS compliant | Environmentally friendly materials | Meets global market access requirements |
Conclusion:
The SHINHOM Toroidal Choke, with four core technical advantages – closed magnetic circuit design, low EMI radiation, 25.4A high current capacity, and wide inductance range – is suitable for a variety of applications including switching power supplies, DC-DC converters, EMI filtering circuits, and output chokes.
For selection recommendations or to request samples based on your specific application (current requirements, inductance, package type, operating temperature), please contact our technical team.
📧 Email: sales@shinhom.com
🌐 Website: www.shinhom.com/
🔗 Product Details & Inquiries: Toroidal Choke