Ferrite Transformer Inductor Core
Description
Technical Parameters
Providing with quality and standard customer-made electronic and passive components ferrite transformer inductor core and solution products, Fullstar Electronics is a leading ferrite transformer inductor core manufacturer and supplier in China. welcome to wholesale electronics ferrite transformer inductor core from our factory.
Products Description
Ferrite core are widely used in computers, tele-communication equipment, consumer's electronics such as TV, VTR and audio sets,industrial automation equipment and various kinds of electronic instruments, etc.As a leading magnets manufacturer in China,supported by our sophisticated quality system, we produce top-quality soft ferrite, together with famous service.Our main products and each application are listed in the following:(For further information about our products.)
An EE-core structure occupies two outer sides of the coil. This constitutes a "shell" type core structure.
An EI-core structure consists of an E-shaped piece and a flat I-shaped bar. The coil is wound on the center leg of the E piece, and the I bar closes the magnetic circuit on the outside. This also constitutes a "shell"-type core structure.
EI-core is a cost-effective structure: the flat I bar allows fast assembly and makes air-gap adjustment easy, which is convenient for flyback transformers and filter chokes requiring precise inductance control. The series of ferrite EI cores includes EI40, EI33, EI30, EI28, EI25, EI22, EI19, EI16, etc.
A PQ-core structure consists of two identical pot-shaped pieces with rectangular outer legs and a round center leg. The coil sits on the center leg and the two halves enclose it - this constitutes a "shell"-type core structure.
PQ-core is designed for high power density: the large winding window and low profile deliver high output power with low leakage inductance, which makes it especially suitable for LLC resonant and high-power switch-mode transformers. The series of ferrite PQ cores are including PQ65/65, PQ50/50, PQ40/40, PQ35/35, PQ32/30, PQ32/20, PQ26/25, PQ26/20, PQ20/20, PQ20/16, etc.
An ETD-core structure consists of two identical E-shaped halves with a round center leg and rectangular outer legs. The coil is wound on the center leg and the two halves close the magnetic circuit - this constitutes a "shell"-type core structure.
ETD-core (Economic Transformer Design) offers a large winding window relative to its footprint, which allows thick wire for high current at a low profile - ideal for high-power transformers in switch-mode power supplies, converters and inverters. The series of ferrite ETD cores are including ETD59, ETD54, ETD49, ETD44, ETD39, ETD34, ETD29, ETD24, etc.
An EP-core structure consists of an E-shaped piece and a matching outer ring that almost fully encloses the coil, leaving only a small opening for the leads - this constitutes a "shell"-type core structure with excellent self-shielding.
EP-core provides the best EMI shielding among ferrite cores: the winding is almost completely enclosed, which minimizes radiated noise - ideal for gate-drive transformers and isolation transformers in telecom and automotive electronics. The series of ferrite EP cores are including EP20, EP17, EP13, EP10, EP7, etc.
A POT-core structure consists of two identical pot-shaped halves: a cylindrical outer wall fully encloses the coil around a round center post - this constitutes a "shell"-type core structure with maximum shielding.
POT-core offers the lowest radiated EMI and the highest shielding efficiency: the coil is completely enclosed inside the cylindrical wall, which also produces a high Q factor - widely used in filters, telecom inductors and precision circuits. The series of ferrite POT cores are including POT42/29, POT36/22, POT30/19, POT26/16, POT22/13, POT18/11, POT14/8, POT11/7, etc.
A DS-core structure consists of a DS piece with a solid cylindrical center post and curved side limbs, matched with an RS slab core that closes the magnetic circuit. The coil is wound around the center post and enclosed by the curved outer limbs - this constitutes a "shell"-type core structure with high shielding efficiency (RS-DS cores are sold in sets).
DS-core combines pot-like shielding with more winding space and easier lead-out: the enclosed coil reduces radiated EMI while the open side windows simplify winding and termination - suitable for filters, telecom inductors and high-Q applications. The series of RS-DS ferrite cores are including 42/29, 36/22, 30/19, 26/13, 23/18, 23/11, 18/11, 14/08, etc.
An RM-core structure consists of two identical rectangular halves with a round center post; the outer walls partially enclose the coil and leave side slots for the leads - this constitutes a "shell"-type core structure with good shielding.
RM-core (Rectangular Module) combines a compact PCB-mounting footprint with better shielding than EE cores: the partially enclosed winding reduces radiated EMI while keeping assembly simple - widely used in DC-DC converters, telecom modules and filters. The series of ferrite RM cores are including RM14, RM12, RM10, RM8, RM7, RM6, RM5, RM4, etc.
A UI-core structure consists of a U-shaped piece and a flat I-shaped bar. The coil is wound around the center section of the U piece, and the I bar closes the magnetic circuit - this constitutes a "core"-type structure, where the winding surrounds the core limb, unlike shell-type EE, ETD or PQ cores.
UI-core provides a large cross-section and easy air-gap adjustment, which makes it suitable for high-power, high-current applications such as chokes, welding transformers and UPS/inverter transformers - and multiple windings can be placed on the same core. The series of ferrite UI cores are including UI120, UI105, UI90, UI75, UI66, UI60, UI55, UI48, UI42, UI33, UI30, etc.
Magnetic Core Materials Compared: Mn-Zn Ferrite, Ni-Zn Ferrite, Iron Powder & Alloy Cores
At Fullstar we custom-manufacture cores in all four major material families - Mn-Zn ferrite, Ni-Zn ferrite, iron powder, and alloy (amorphous / nanocrystalline) cores. Each material has a different trade-off between permeability, saturation, frequency capability, size and cost, so the right choice depends on your application - not on which material is "best" in general.
The short version: Mn-Zn ferrite for power transformers below 1 MHz, Ni-Zn ferrite for EMI and RF above 1 MHz, iron powder for inductors under heavy DC bias, and amorphous/nanocrystalline alloy for the highest power density and efficiency.
The four materials at a glance
| Property | Mn-Zn Ferrite | Ni-Zn Ferrite | Iron Powder | Alloy Core (Amorphous / Nanocrystalline) |
|---|---|---|---|---|
| Material type | Soft ferrite ceramic | Soft ferrite ceramic | Iron powder with distributed air gap | Metallic alloy ribbon (wound/tape core) |
| Initial permeability | 700–15,000 | 10–1,500 | 10–125 (effective) | 1,000–100,000+ (nanocrystalline up to ~12× Mn-Zn) |
| Saturation flux density | ~0.4–0.5 T | ~0.25–0.4 T | ~0.8–1.5 T | ~1.2–1.56 T (amorphous); ~1.2–1.25 T (nanocrystalline) |
| DC bias behavior | Saturates sharply | Saturates sharply | Soft saturation - permeability drops gradually, handles large DC current | Very stable, high current handling |
| Electrical resistivity | Low (ceramic) | Very high | High (insulated particles) | Low (metallic - needs coating/lamination) |
| Usable frequency | 10 kHz–1 MHz | 1 MHz–100 MHz+ | Up to ~100 kHz–1 MHz (grade dependent) | Amorphous: kHz–tens of kHz; nanocrystalline: kHz–hundreds of kHz |
| Core loss | Low below 1 MHz | Low above 1 MHz | Higher than ferrite, rises fast with frequency | Very low (nanocrystalline), smaller size for same power |
| Typical applications | SMPS transformers, power inductors, chokes | EMI suppression beads/sleeves, RF inductors, antennas | DC-biased power inductors: PFC boost, buck/boost, output chokes | High-power transformers, EV charging, common-mode chokes, precision current transformers |
| Relative cost | Low | Low | Low | Medium–high |
When to choose which material
| Application scenario | Recommended material | Why |
|---|---|---|
| Switching power supply transformer (flyback, forward, LLC) under 1 MHz | Mn-Zn ferrite | Lowest loss in the 10 kHz–1 MHz power range, high saturation, lowest cost |
| EMI suppression on cables/boards, RF inductors, antenna cores | Ni-Zn ferrite | Ultra-high resistivity keeps losses negligible at 1 MHz–100 MHz+ |
| Power inductor with large DC bias - PFC boost, buck/boost, output filter chokes | Iron powder (or alloy powder: Sendust / High Flux / MPP) | Soft saturation: inductance holds up under heavy DC current where ferrite would saturate |
| High-power, high-efficiency transformers - EV chargers, PV inverters, welding; common-mode chokes; precision current transformers | Amorphous / nanocrystalline | Highest permeability and lowest loss per unit volume → smaller core, higher efficiency, higher cost |
Amorphous vs nanocrystalline (within "Alloy core"): amorphous alloy (iron-based) offers high saturation (~1.4–1.56 T) and is a cost-effective upgrade over silicon steel at power frequencies; nanocrystalline (Finemet-type) delivers extreme permeability and the lowest core loss at high frequency, preferred for EV charging, high-frequency transformers and precision measurement.
We custom-make all four - get a recommendation
Send us your operating frequency, power, DC bias current, size limit and target cost, and our engineers will recommend the material, grade, and core shape (EE, EI, EFD, EPC, ETD, PQ, RM, POT, toroidal, planar or tape-wound) - with a design proposal within 24 hours.
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.
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