Toroidal Choke comprises a closed magnetic circuit core made of iron powder or ferrite material .The closed magnetic path effectively confines magnetic flux within the core, minimizing leakage flux and reducing electromagnetic interference to surrounding circuits.
The product range offers inductance values from 0.47 µH to 2200 µH and is available in both surface-mount (SMD) and leaded versions. These chokes can be easily integrated into automated assembly lines or manual soldering processes. They are widely used in DC/DC converters, switching power supplies, and EMI filtering circuits.
How to Choose a Toroidal Inductor?
When selecting a toroidal inductor, key factors include inductance value, rated current, operating frequency, core material, and physical size. It is also important to consider the operating environment, such as temperature conditions, vibration, and long-term reliability requirements.
| Product families | 1. Leaded Toroidal Inductor | 2. SMD Toroidal Inductor |
1.Leaded Toroidal Inductor Family ✉
FEATURE:
- Low core loss
- Low magnetic radiation
- High current capacity
- Horizontal or vertical mount available
- Operating temperature: -55℃ to +125℃(Max high 200℃)
APPLICATIONS:
- Switch mode power supplies
- DC/DC converter
- Output chokes
- EMI fi lters
Series in this family
| Product Series | L(µH) | IDC(A) | DCR Max(Ω) | |
| ATC-TC | 40-470 | 0.5-3 | 0.045-0.1 | ✉ |
| TM | 1.0-1000 | 1.6-38.7 | 0.002-0.49 | ✉ |
| TR | 10-1000 | 1.3-20.2 | 0.0022-0.4 | ✉ |
| TR75 | 180-720 | - | 0.02-0.042 | ✉ |
| TS | 1.0-1000 | 1.5-34 | 0.001-0.284 | ✉ |
2.SMD Toroidal Inductor Family ✉
FEATURE:
- Higher Frequency
- High Saturation Material
- Low EMI Radiation
- Pick and PLace
- Low DC Resistance
- Operating temperature: -40℃ to +125℃
- Storage Temperature: -40℃ to +125℃
APPLICATIONS:
- Electronic Appliances
- DC - DC Conversion (Paraller Mode)
- Isolation/Coupling(Transformer)
- Input Filter(Serial Mode)
- EMI/RFI Suppression
Series in this family
| Product Series | L(µH) | IDC Max(A) | DCR Max(mΩ) | |
| STC0718 | 0.42-100 | 0.24-3.0 | 24-1320 | ✉ |
| STR | 1.1-2000 | 0.18-3.2 | 9.3-1932 | ✉ |
| STR30 | 1.8-390 | 0.6-12 | 12-640 | ✉ |
| STR38 | 1.5-470 | 0.74-18 | 9.3-657 | ✉ |
| STR44 | 5.6-2200 | 0.38-11 | 16.2-1908 | ✉ |
| STR50 | 10-4700 | 0.31-9.0 | 19.7-1932 | ✉ |
| STR8052 | 1.0-1000 | 1.9-25.4 | 2-215 | ✉ |
| STRD | 0.88-77 | 1.1-22.4 | 2.4-309 | ✉ |
| STR0918 | 0.47-47 | 0.43-3.0 | 108.5-769.9 | ✉ |
📧Frequently Asked Questions
Q1. What are the advantages of toroidal chokes compared with traditional drum-core inductors?
The closed magnetic circuit design confines magnetic flux within the core, resulting in extremely low leakage flux and reduced EMI radiation.
Toroidal chokes also provide higher inductance per unit volume, making them ideal for high-density installations.
Q2. How do I choose between SMD and leaded versions?
SMD Versions
- Ideal for automated mass production
- Save PCB space
- Suitable for compact designs
Leaded Versions
- Suitable for manual soldering
- Better for applications requiring higher current handling capability
Q3. Does inductance decrease as current increases?
Yes.
Toroidal chokes using iron powder cores exhibit a soft saturation characteristic. As current increases, inductance gradually decreases as it approaches the saturation current (Isat).
When selecting a component, sufficient design margin should be reserved based on the actual operating current.
Shinhom is dedicated to setting a high bar of excellence for industries that integrate or utilize magnetics technologies in our Toroidal choke products.
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