Dedicated Shielded Chokes - Manufacturing Custom "Low EMI" Chokes for Modern Electronics
Modern microelectronics require components with increasingly higher efficiency, higher power density, and—most importantly — minimal electromagnetic interference emissions and high interference immunity. Therefore, shielded inductors have become commonplace in modern power supply systems, DC/DC converters, automotive electronics, and many high-frequency systems, for example, in the telecommunications industry.
The production of custom shielded inductors enables optimization of:
- EMI/EMC parameters,
- power efficiency,
- operating temperature,
- saturation current,
- component size,
- frequency response,
- core and winding losses.
Custom shielded SMD and THT inductors are designed precisely to meet the requirements of a specific application, ensuring high reliability and parameter stability.
What are shielded inductors?
Today’s modern shielded inductors are inductors equipped with a “magnetic shield”—in practice, this is a ferrite housing or overlay—usually snapped or glued onto the body or winding core. Alternatively, a special steel housing can serve as a shield, in which the choke is placed and—for example—encapsulated with glue, resin, silicone, or another rigid or flexible sealant.
The use of shielding is intended to limit electromagnetic field emissions outside the component’s area or to limit the impact of external electromagnetic fields (usually noise and interference) on the component’s operation. As a result, shielded chokes reduce EMI levels, increase resistance to unfavorable environmental conditions, improve electromagnetic compatibility (EMC), enable denser component placement on PCBs (important, for example, in VRM power supply circuits on computer motherboards), and reduce interference between adjacent components.
Modern shielded power chokes are widely used in buck and boost voltage converters, VRM systems, automotive electronics, telecommunications, embedded systems, medical devices, servers, industrial electronics, and RF and 5G applications.
Shielded chokes - Most important technical parameters
In modern electronics, a properly designed shielded power choke is crucial for the energy efficiency, electromagnetic compatibility, and reliability of the entire electronic system.
Below are the approximate ranges of electrical and mechanical parameters:
| PARAMETER | SHIELDED INDUCTORS | |
| Wire type | Solderable and non-solderable: CuL 155 – 200, Gr.1 – 2 (typical) | |
| Other types of wires are available on request. | ||
| Wire diameter | Min | 0.04 mm |
| Max | 2.00 mm | |
| Other wire diameters are available on request. | ||
| Winding direction | Left, Right | |
| Number of winding layers | Typical | TBD |
| Minimum | 1 | |
Coil shape | Depends on the shape of the ferrite core. Bobbin, bar, and others. | |
| Housing shape and material to be determined. | ||
| Unusual shapes or requirements – Possibility of individual arrangement upon request. | ||
Types of cores used | Ferrite Cores, Powder Cores, Metal Composite | |
| Typical saturation current ranges (Isat) |
| |
| Typical DC resistance (DCR) |
| |
| Typical operating frequency | Depends on the application and the choice of materials (especially the hysteresis of the ferrite core)
| |
| Leads | Typically – soldered to the core. | |
| Compression-welded. | ||
| Metallized with silver wire for reinforcement. | ||
| Other finishes are available upon request. | ||
| Location and shape of pins | Typically – wrapping around specific core points. | |
| Depending on the core shape – pinout according to the core and customer requirements. | ||
Soldering | Pb Free | |
| Pb (on request) | ||
Contact
If you have any questions, need more information, or would like to place an order, please contact us.
