High Current Surface Mount Unshielded Inductors (SDR SERIES) | High Current Power Inductor Manufacturer | Coilmaster Electronics
Manufacturer of Compact unshielded SMD power inductor with Ni-Zn ferrite core for high-frequency portable electronics. The SDR Series is a long-running family of compact wire-wound SMD power inductors built with Ni-Zn ferrite cores. Its simple open-magnetic construction—direct electrode contact and a single drum core—delivers cost-efficient energy storage performance for small to medium current DC-DC converter stages. With over a decade of proven reliability in mass-production products, this series remains widely adopted in portable electronics and value-driven consumer devices. Coilmaster Electronics is a high-current High Current Power Inductors, Automotive Grade Chokes & Inductors,High Frequency and Planar Transformers, LAN Magnetics (RJ45), Multilayer Chip Beads manufacturer from Taiwan since 1995. Coilmaster offers AEC-Q200 certified, high-efficiency power inductors, chokes, and transformers. Specializing in low-loss, high-current components for Automotive, 5G, and Industrial applications. Contact our experts for instant support. With more than 20 years of experience in magnetic territory, Coilmaster Electronics is specialized in the production of SMD power inductors, common mode choke, high frequency transformers.
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High Current Surface Mount Unshielded Inductors (SDR SERIES)
Compact Unshielded Power Inductors (Ni-Zn Core, Cost-Efficient)
The SDR Series is a long-running family of compact wire-wound SMD power inductors built with Ni-Zn ferrite cores. Its simple open-magnetic construction—direct electrode contact and a single drum core—delivers cost-efficient energy storage performance for small to medium current DC-DC converter stages. With over a decade of proven reliability in mass-production products, this series remains widely adopted in portable electronics and value-driven consumer devices.
As Ni-Zn ferrite enables better frequency characteristics in small packages, SDR inductors provide stable operation in switching regulators without the cost overhead of full magnetic shielding. Extensive dimension coverage from 3 mm up to 13 mm allows engineers to maintain footprint continuity even in legacy designs undergoing cost reduction. Custom inductance values and alternative pad layouts are available.
When to Choose SDR?
SDR inductors are ideal when cost, small form factor, and sufficient DC-DC performance matter more than strict EMI containment. For high-current or EMI-sensitive rails, Coilmaster recommends upgrading to shielded SDS/SDC/SBS or molded inductors.
Key Highlights
Mature Ni-Zn platform with stable switching characteristics
Open magnetic structure for low cost and compact build.
Electrode-to-core contact improves mounting density for tight PCB layouts
Wide dimension range (3 to 13 mm) supports legacy product continuation
Characteristic
Ni-Zn ferrite optimized for high-frequency portable DC-DC converters
Cost-efficient construction without shielding materials
Moderate current capability with small footprint
Simple structure reduces manufacturing risk and keeps long-term supply stable
Features
- Small footprint & thin profile
- Open magnetic construction
- Direct electrode-core mounting for compact PCB layouts
- Wide footprint offering for legacy platform compatibility
- RoHS, REACH, Halogen-Free
Applications
- Power line filtering in smartphones, tablets, HDD/SSD, game consoles
- General DC-DC converters where EMI protection is handled elsewhere in the system
- Consumer electronics requiring stable cost-to-performance ratio
- Legacy platforms needing footprint continuity & long-term supply
| Image | name | Size(mm) | Inductance(uH) | Isat(A) | Irms(A) | DCR(mΩ) | Action |
|---|---|---|---|---|---|---|---|
| 1uH, 2.08A Miniature wirewound SMD power inductor | 3.5x3.0x2.5 | 1 | 2.08 | 2.08 | 70 | |
|
| 1.4uH, 1.86A Low profile SMD wirewound power inductor | 3.5x3.0x2.5 | 1.4 | 1.86 | 1.86 | 90 | |
|
| 1.8uH, 1.8A High current SMD power choke | 3.5x3.0x2.5 | 1.8 | 1.8 | 1.8 | 110 | |
|
| 2.2uH, 1.39A SMD wirewound miniature power inductor | 3.5x3.0x2.5 | 2.2 | 1.39 | 1.39 | 130 | |
|
| 2.7uH, 1.32A Surface mount wirewound miniature inductors | 3.5x3.0x2.5 | 2.7 | 1.32 | 1.32 | 140 | |
|
| 3.3uH, 1.25A Miniature SMD power chokes | 3.5x3.0x2.5 | 3.3 | 1.25 | 1.25 | 200 | |
|
| 3.9uH, 1.2A Low profile SMD choke coils | 3.5x3.0x2.5 | 3.9 | 1.2 | 1.2 | 210 | |
|
| 4.7uH, 1.03A Silver plated SMD wirewound power inductor | 3.5x3.0x2.5 | 4.7 | 1.03 | 1.03 | 330 | |
|
| 5.6uH, 0.91A High current unshielded power inductor | 3.5x3.0x2.5 | 5.6 | 0.91 | 0.91 | 350 | |
|
| 6.8uH, 0.85A miniature high current wirewound power inductor | 3.5x3.0x2.5 | 6.8 | 0.85 | 0.85 | 380 | |
|
| 8.2uH, 0.82A non shielded power inductor with small dimension | 3.5x3.0x2.5 | 8.2 | 0.82 | 0.82 | 430 | |
|
| 10uH, 0.74A unshielded high current inductor for low cost designed | 3.5x3.0x2.5 | 10 | 0.74 | 0.74 | 500 |
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High Current Surface Mount Unshielded Inductors (SDR SERIES) | High Current Power Inductor Manufacturer | Coilmaster Electronics
Located in Taiwan since 1995, Coilmaster Electronics Co., Ltd. has been a manufacturer of magnetic components. Its main magnetic components include, High Current Surface Mount Unshielded Inductors (SDR SERIES), common mode chokes, SMD molding power chokes, chock coil inductors, SMD shielded and semi-shielded power inductors, low profile and high current power inductors, high voltage power inductors, ethernet and LAN power transformers, flat wire inductors, RJ45 jacks with integrated magnetics and high frequency transformers, and ceramic or air coil multilayer chip inductors.
Coilmaster offers AEC-Q200 certified, high-efficiency power inductors, chokes, and transformers. Specializing in low-loss, high-current components for Automotive, 5G, and Industrial applications. Contact our experts for instant support. With more than 20 years of experience in magnetic territory, Coilmaster Electronics is specialized in the production of SMD power inductors, common mode choke, high frequency transformers.
Coilmaster Electronics has been providing customers with high current power inductors since 1995, with both advanced technology and 29 years of experience, Coilmaster Electronics ensures that each customer's requirements are met.