What Is a Toroidal Inductor?
A toroidal inductor is an inductor formed by winding insulated copper wire around a toroidal (ring-shaped) magnetic core made of materials such as ferrite or iron powder. The closed magnetic path of the toroidal core allows the magnetic field to circulate efficiently within the core, improving inductance performance and reducing electromagnetic interference.
When electric current flows through the winding, it generates a magnetic field inside the core. The strength of this magnetic field depends on the current level and the number of turns in the coil. Because the magnetic flux is largely contained within the closed-loop core, toroidal inductors offer high efficiency and stable electrical performance.
Compared with traditional inductors, toroidal inductors are typically more compact, lighter, and more efficient, while producing very low electromagnetic interference (EMI). These characteristics make them widely used in power supplies, inverters, amplifiers, telecommunications equipment, computers, and audio systems.
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 | ✉ |
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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