Wound SMD Inductor
Description
Technical Parameters
Providing with quality and standard customer-made electronic and passive components wound smd inductor and solution products, Fullstar Electronics is a leading wound smd inductor manufacturer and supplier in China. welcome to wholesale electronics wound smd inductor from our factory.
Applications of SMD Inductor
SMD inductors are widely used in various electronic applications, including:
DC-DC converters and power supply modules
Smartphones, tablets, and wearable devices
Automotive electronics and electric vehicle systems
LED lighting and driver circuits
Communication equipment and RF circuits
Industrial automation and control systems
Consumer electronic products
Construction types
SMD inductors are not one product family. The construction technology determines how much current the part can carry, how well it is shielded and how it behaves at frequency.
| Type | Construction | Typical frequency range | Best suited to | Advantages | Limitations |
|---|---|---|---|---|---|
| Multilayer signal | Screen-printed ferrite windings stacked inside a ceramic / ferrite body | kHz to low MHz | Filters, resonant circuits, bias chokes | Good intrinsic shielding, very small, low cost, very repeatable inductance | Limited current, lower Q, lower SRF |
| Power multilayer | Printed windings inside a ferrite body | roughly 100 kHz to ~10 MHz | DC-DC converters in portable devices | Very small footprint, shielded, low DCR | Lower saturation current than an equivalent wire-wound part |
| Wire-wound, open | Enamelled wire wound on a ferrite core, open frame | roughly 100 kHz to a few MHz | General power chokes, point-of-load regulators | High current capability, high Q, low DCR | Radiated field / EMI, less protection from moisture and contamination |
| Wire-wound, molded / shielded | Wire on core fully molded or encapsulated into a single body | power through RF | Power chokes, RF chokes, high-reliability designs | Excellent shielding, environmental robustness, high power density | Slightly higher DCR and larger package |
| Thin-film / air-core RF | Planar or fine-wire winding on a low-loss substrate | tens of MHz to GHz | RF matching networks, impedance matching | Very high SRF and Q, tight tolerance | Very low inductance values, small currents only |
As a rule of thumb: molded constructions are inherently stronger on efficiency, shielding and power density, because the molding process encloses the winding in a magnetic body; multilayer parts win on size and cost for signal-level duties; open wire-wound parts win on current per unit volume but sacrifice shielding.
Core materials
The core material defines the usable frequency band, the loss level and the DC-bias behaviour - which is why two inductors with identical nominal inductance and current ratings can run at very different temperatures.
| Core material | Permeability | Loss behaviour | DC bias / saturation | Typical band | Typical use |
|---|---|---|---|---|---|
| NiZn ferrite | Medium | Moderate in the 1–10 MHz region | Moderate | Up to about 10 MHz for power; higher for small-signal RF | Power multilayer, small RF chokes |
| MnZn ferrite | High | Higher above roughly 1 MHz | Moderate to high | Lower frequencies | Chokes and filters for lower-frequency power |
| Powdered iron / alloy powder | Low to medium | Lower at power frequencies | High, thanks to the distributed air gap | Roughly 100 kHz – 1 MHz | Power chokes needing high saturation current |
| Metal composite / molded alloy | Low to medium | Low | Very high | Roughly 100 kHz – 5 MHz | High-current molded power inductors |
| Nanocrystalline / amorphous | Medium to high | Very low up to MHz | High | MHz region | Low-loss chip inductors |
| Air / non-magnetic | 1 | None in the core | No saturation | GHz | RF, ultra-high SRF |
A practical consequence: a distributed-air-gap powder core tolerates far more DC current before its inductance collapses, while a high-permeability MnZn core gives more inductance per turn but saturates earlier and loses more energy at multi-MHz switching.
How to select an SMD inductor
Define the application and frequency band. A 2 MHz buck converter and a 100 MHz RF matching network need different product families entirely.
Pick the family and core material. Power multilayer or molded alloy for compact power; open wire-wound where current and efficiency dominate; multilayer or thin-film for RF.
Calculate the inductance from the acceptable ripple current (commonly 20%–40% of the DC output current) or from the required filter corner frequency.
Check the saturation current by calculating the peak inductor current and leaving typically 20%–30% margin below Isat.
Check the rated current against the RMS current so that self-heating stays within the thermal budget.
Minimize DCR within the size and cost constraints - the largest gains are on low-voltage, high-current rails.
Verify SRF is several times higher than the switching frequency.
Confirm the mechanical fit - case size, maximum height, land pattern, shielding type.
Verify compliance - AEC-Q200 for automotive, RoHS / REACH / halogen-free as required.
Validate on the bench - measure ripple current, efficiency and temperature rise, and adjust if needed.
Always check the impedance-versus-frequency curve rather than the nominal inductance alone; a datasheet curve shows the real usable range.
Why Choose Our SMD Inductors?
As a professional SMD inductor manufacturer and supplier, we provide high-quality inductors with consistent performance, competitive pricing, and flexible customization options. Our products are tested to ensure excellent reliability, thermal stability, and electrical performance for different application requirements.
Whether you need standard SMD inductors or customized solutions, we can provide reliable components to support your PCB design and electronic manufacturing needs.
Contact us today for more information about our SMD inductor products, specifications, samples, and bulk purchasing options.
Company Information
We a premier professional manufacturer specializing in magnetic components and electronic solutions. Founded in 2009 and headquartered in the high-tech hub of Xi'an, we have accumulated over 15 years of deep expertise in the research, development, and production of high-performance transformers and inductors. Our facility spans 3,000 square meters and is powered by a dedicated workforce of 300+ skilled professionals, including a senior R&D team focused on bespoke magnetic designs.
Our comprehensive product line features high-frequency and low-frequency transformers, toroidal transformers, current transformers, and a wide variety of inductors and magnetic cores. As a Top 6 leading factory for Industrial Controls, we provide critical components for power supplies, telecommunications, automotive electronics, and green energy sectors globally.
Quality is our core competency. Fullstar operates under a strict ISO9001:2015 Quality Management System. Our products carry international safety and environmental certifications including UL, CE, RoHS, and REACH. Every unit undergoes a 100% rigorous testing process before shipment to ensure zero-defect reliability in demanding industrial environments.
We excel in customization. With advanced design-based and sample-based capabilities, we offer rapid 7-day prototyping and flexible OEM/ODM services. Our supply chain reaches over 80 countries, providing localized support and cost-effective logistics. Whether you require high-volume production or small-batch custom coils, Fullstar delivers precision-engineered magnetic components that drive your innovation forward. We welcome global business inquiries for long-term strategic partnerships.
Certification And Exhibition
FAQ
What is the difference between a multilayer and a wire-wound SMD inductor?
Multilayer parts use windings screen-printed inside a ceramic or ferrite body. They are very small, well shielded and inexpensive, which suits filters, resonant circuits and low-current supplies. Wire-wound parts use enamelled wire on a core and handle higher currents with higher Q and lower DCR, at the cost of size and - in open constructions - shielding.
How do I choose between shielded and unshielded?
Choose shielded or molded for switching regulators and dense boards, where a fast-changing magnetic field can couple into nearby traces and make EMC testing harder. Unshielded parts are acceptable where cost is the priority, board density is low, or the field is already contained.
What is the difference between Isat and Irated?
Isat is the current at which the core saturates and the inductance falls by a defined amount (commonly 20%–30%). Irated is the current that heats the part by a defined amount, typically 40 K above ambient. One is a magnetic limit, the other a thermal limit, and a design must satisfy both.
Why does the self-resonant frequency matter?
At SRF the winding capacitance resonates with the inductance and the component stops behaving inductively. Operating close to or above SRF causes high losses and unpredictable impedance, so most designs keep the working frequency at least about one octave below it.
Do core materials really change performance that much?
Yes. Permeability sets how much inductance a given number of turns produces; loss behaviour sets how hot the part runs at a given frequency; and the core's saturation characteristics determine how much DC current the part tolerates before inductance collapses. Two parts with the same nominal L and current rating can behave very differently under load.
Can one inductor type cover both power and RF applications?
In practice, no. Power chokes are designed for high current and low DCR in the hundreds of kHz to a few MHz, while RF inductors prioritize high Q and high SRF in the tens to hundreds of MHz but carry only small currents. They are different product families.
Why does my SMD inductor get hot?
The usual causes are winding (I²R) loss from too high a DCR for the RMS current, core loss at the switching frequency, core saturation from peak current exceeding Isat, or simply insufficient copper area on the board to spread heat. Checking the actual peak and RMS currents against Isat and Irated is the first diagnostic step.
What does a case size like 0805 or 4040 mean?
0805 is an imperial (EIA) code: the footprint in hundredths of an inch, equivalent to roughly 2.0 × 1.25 mm. 4040 is a metric code: 4.0 × 4.0 mm. Both are nominal - always confirm the exact dimensions, height and land pattern in the datasheet.
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