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The INF SI Leaded Toroidal Storage Choke is a high-performance passive inductor designed for switching power supplies and voltage transformation systems, targeting ToB customers in industrial electronics, automotive electronics, and power supply module manufacturing. Manufactured with iron powder core material and a closed toroidal magnetic circuit structure, this toroidal storage choke features ultra-low magnetic stray field, low core loss, and low DC resistance (DCR), supporting switching regulators operating up to 100 kHz. With a wide rated current range of 1.1 A to 14.5 A and inductance values from 12 μH to 1619 μH, the SI leaded toroidal inductor can adapt to diverse circuit load demands, realizing energy storage and output current smoothing in switching power supply circuits. Its high power density and excellent electromagnetic compatibility (EMC) make it a core component for modern high-frequency switching power supply systems.
Adopting a closed toroidal magnetic circuit design, the choke confines magnetic field lines within the core, achieving ultra-low magnetic flux leakage and excellent EMI immunity. This design effectively reduces electromagnetic coupling with adjacent circuit components, ensuring the EMC compliance of the whole power supply system and meeting the strict electromagnetic interference requirements of industrial equipment.
Made of high-quality iron powder core material with three-dimensionally distributed microscopic air gaps, the choke minimizes core loss during high-frequency operation; the uniform winding distribution of the toroidal structure further reduces DC resistance, improving power conversion efficiency and reducing heat generation—critical for the miniaturization and heat dissipation of power supply modules.
Covering a rated current range of 1.1 A to 14.5 A and an inductance range of 12 μH to 1619 μH, the iron powder toroidal storage choke can be flexibly matched with low-power and medium-power switching power supply circuits, meeting the diverse design needs of customers in consumer electronics and industrial control fields.
Optimized for high-frequency operation, it stably supports switching regulators up to 100 kHz, matching the working frequency of modern switching power supplies and DC-DC converters, and ensuring stable energy storage and current smoothing performance under high-frequency conditions.
Order Code | L | lR | lSAT | RDC max. | fres |
INF-SI-12μH | 12 | 14.5 | 6.9 | 0.008 | 44.6 |
INF-SI-26μH | 26 | 10.3 | 4 | 0.015 | 25 |
INF-SI-34μH | 34 | 5.2 | 1.8 | 0.038 | 11 |
INF-SI-37μH | 37 | 3.1 | 1.8 | 0.06 | 23 |
INF-SI-48μH | 48 | 8.1 | 3 | 0.025 | 13.6 |
INF-SI-49μH | 49 | 5.8 | 2.2 | 0.05 | 16 |
INF-SI-50μH | 50 | 1.7 | 1.5 | 0.18 | 19.1 |
INF-SI-53μH | 53 | 3 | 1.4 | 0.08 | 16.8 |
INF-SI-73μH | 73 | 1.4 | 1.2 | 0.23 | 14 |
INF-SI-75μH | 75 | 5.8 | 2 | 0.04 | 15 |
INF-SI-80μH | 80 | 2.5 | 1 | 0.1 | 6.5 |
INF-SI-82μH | 82 | 7.7 | 1.7 | 0.03 | 5.4 |
INF-SI-92μH | 92 | 5.4 | 2.3 | 0.05 | 9 |
INF-SI-109μH | 109 | 1.3 | 1 | 0.3 | 9.2 |
INF-SI-127μH | 127 | 2.3 | 1 | 0.12 | 4.8 |
INF-SI-137μH | 137 | 7 | 2 | 0.05 | 6.4 |
INF-SI-157μH | 157 | 5.1 | 1.5 | 0.063 | 3 |
INF-SI-167μH | 167 | 1.35 | 0.72 | 0.4 | 4.1 |
INF-SI-172μH | 172 | 6.5 | 2 | 0.055 | 3.1 |
INF-SI-200μH | 200 | 2.2 | 0.9 | 0.18 | 3 |
INF-SI-220μH | 220 | 7.1 | 2 | 0.06 | 4.7 |
INF-SI-258μH | 258 | 1.2 | 0.6 | 0.4 | 3 |
INF-SI-345μH | 345 | 2.1 | 0.5 | 0.2 | 1.8 |
INF-SI-346μH | 346 | 3.8 | 1.5 | 0.14 | 3.3 |
INF-SI-380μH | 380 | 6.2 | 2 | 0.07 | 1.5 |
INF-SI-390μH | 390 | 2 | 0.8 | 0.25 | 1.8 |
INF-SI-393μH | 393 | 1.1 | 0.5 | 0.7 | 2.1 |
INF-SI-557μH | 557 | 1.1 | 0.7 | 0.7 | 2.5 |
INF-SI-600μH | 600 | 2.2 | 1.1 | 0.33 | 1.3 |
INF-SI-630μH | 630 | 3.1 | 1 | 0.175 | 1.5 |
INF-SI-727μH | 727 | 3.5 | 1.4 | 0.24 | 1.8 |
INF-SI-890μH | 890 | 2 | 0.9 | 0.4 | 0.85 |
INF-SI-1124μH | 1124 | 3.4 | 1 | 0.28 | 0.65 |
INF-SI-1619μH | 1619 | 1.8 | 0.7 | 0.48 | 0.5 |
As a key energy storage component, it is widely used in AC-DC and DC-DC switching power supplies of consumer electronics and industrial equipment, realizing current smoothing and energy buffering to improve the stability of power supply output.
Suitable for step-up and step-down DC-DC converters in automotive electronics and portable industrial equipment, its low loss and high frequency performance ensure the efficiency and stability of voltage conversion.
Matched with medium and low power voltage transformers, it optimizes the current waveform and reduces magnetic interference, improving the overall performance of the transformer in industrial power distribution systems.
Applicable to power regulation and energy storage circuits of industrial control and automation equipment, its wide current range and excellent EMC performance adapt to the complex electromagnetic environment of industrial sites.
The INF SI Leaded Toroidal Storage Choke is a RoHS compliant product with a lead-free manufacturing process and no SVHC substances specified in REACH, meeting the environmental protection requirements of global markets including Europe and North America. It has obtained CE certification and complies with IEC 60130-11 passive inductor industry standards, with its electromagnetic compatibility performance meeting IEC 61000 EMC specifications, ensuring no interference to the surrounding electronic system during operation. All products undergo strict core loss and DCR testing before leaving the factory to ensure consistent performance indicators.
Based on customer circuit design requirements, the company provides customized services for inductance values, rated current, and winding parameters; for special application scenarios (such as high-temperature and high-vibration environments), customized core materials and structural designs can be provided with professional technical verification.
Support small-batch sample procurement (minimum order quantity 1 piece) and large-batch bulk procurement, with tiered pricing for large orders to reduce customer procurement costs. The standard packaging is anti-static bulk packaging, and the delivery time is 7–20 working days according to the procurement quantity and customization requirements. The official inquiry channel provides 24-hour quotation and technical consultation services, and the after-sales team provides long-term product performance tracking and technical support.
