Ferrite Core Manufacturer | MnZn & NiZn
Quick AnswerFerrite cores are ceramic magnetic components made from iron oxide combined with manganese-zinc (MnZn) or nickel-zinc (NiZn). They deliver very low core loss at high frequency (100 kHz–1 MHz+), high permeability and low cost, making them the standard for transformers, EMI filters, chokes and low-power high-frequency power supplies. YUTE Magnetics supplies custom ferrite cores and ferrite-based power inductors with full-process quality control and IATF 16949 / AEC-Q200 certification.
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Engineering Resources
Ferrite cores are the most widely used magnetic material in power electronics. They combine very low core loss at high frequency with high permeability and low material cost. This guide covers the two main ferrite families (MnZn and NiZn), common core shapes, how ferrite compares with powder cores, and what to look for when sourcing custom ferrite cores from a manufacturer.
1. What Is a Ferrite Core?
A ferrite core is a soft magnetic ceramic made from iron oxide (Fe2O3) combined with metallic oxides such as manganese-zinc or nickel-zinc, sintered at high temperature. Because ferrite is a ceramic, it has very high electrical resistivity, which suppresses eddy currents and keeps core loss extremely low at high frequency. Ferrite cores are pressed into shapes such as E, EI, EFD, PQ, EP, RM, toroid, pot and planar geometries, then wound with copper to form transformers, inductors and chokes.
2. MnZn vs NiZn Ferrite
| Property | MnZn Ferrite | NiZn Ferrite |
|---|---|---|
| Permeability | High (1000 – 15000) | Low to medium (15 – 1000) |
| Frequency range | Up to ~1 MHz (power), ~3 MHz (signal) | 1 MHz – 100+ MHz |
| Resistivity | Medium | Very high |
| Core loss | Very low at 20 kHz – 1 MHz | Low at 1 MHz+ |
| Typical use | Power transformers, power inductors, PFC, EMI filters | High-frequency chokes, antennas, RF inductors |
3. Common Ferrite Core Shapes
| Shape | Common Codes | Typical Applications |
|---|---|---|
| E / EI cores | E16–E80, EI22–EI75 | Power transformers, output chokes, PFC |
| EFD cores | EFD15–EFD30 | Flat low-profile transformers (LED, adapters) |
| PQ cores | PQ20–PQ50 | High-power transformers, server power |
| EP cores | EP7–EP20 | Telecom and signal transformers |
| RM cores | RM4–RM14 | Filter inductors, DC-DC converters |
| Toroid cores | T10–T157 | EMI chokes, current sensors, filters |
| Pot cores | P11–P36 | Precision inductors, tuned circuits |
| Planar cores | E22–E64 planar | On-board power modules, low-profile designs |
4. Ferrite vs Powder Core: How to Choose
- Choose ferrite when: switching frequency is above ~500 kHz, power is low to medium, cost matters, or the design needs very low core loss (transformers, PFC, LLC)
- Choose FeNi / powder cores when: current is high, DC bias is large, temperature range is wide, or EMI must be minimized (AI GPU VRM, EV charging, solar, ESS)
- Ferrite needs a physical air gap in power inductors, which radiates fringing flux; powder cores distribute the gap internally
- Ferrite permeability drops sharply near the Curie temperature (typically 120–250°C); powder cores stay stable to +180°C
5. Custom Ferrite Core Manufacturing
When catalog ferrite cores do not fit your mechanical or electrical requirements, a custom core is the answer. YUTE Magnetics supports custom ferrite core development end to end: material grade selection, core geometry and tooling design, prototyping, AEC-Q200 qualification and volume production. Send your frequency, power, size and cost targets, and our engineers will recommend the material grade and core shape within 24 hours.
6. Quality and Certification
- IATF 16949 automotive quality management system
- AEC-Q200 passive component qualification available
- ISO 9001 / ISO 14001 certified production
- 100% electrical testing (inductance, permeability, loss) and AI visual inspection
- RoHS / REACH compliant materials
- 500M+ pcs annual capacity with 2–4 week standard lead time
7. Get Started
Whether you need standard ferrite cores, ferrite-based power inductors or a fully custom magnetic component, the fastest way to evaluate options is to share your electrical and mechanical targets. Samples and technical evaluation are free; the engineering team responds within 24 hours.
Frequently Asked Questions
What are ferrite cores made of?
Ferrite cores are ceramic soft magnetic materials made from iron oxide (Fe2O3) combined with manganese-zinc (MnZn) or nickel-zinc (NiZn) oxides, pressed and sintered at high temperature. Their high electrical resistivity keeps eddy-current losses very low at high frequency.
What is the difference between MnZn and NiZn ferrite?
MnZn ferrite has high permeability (1000–15000) and is best below ~1 MHz for power transformers and inductors. NiZn ferrite has lower permeability but much higher resistivity, suiting frequencies from 1 MHz to over 100 MHz in EMI chokes and RF inductors.
What are ferrite cores used for?
Ferrite cores are used in power transformers, switch-mode power supplies, PFC and LLC converters, EMI filters, common-mode chokes, output chokes, current transformers and signal/RF inductors across consumer, industrial and automotive electronics.
Do you manufacture custom ferrite cores?
Yes. We offer custom ferrite core development including material grade selection, core geometry and tooling, prototyping, AEC-Q200 qualification and volume production. Send your frequency, power, size and cost targets for a free engineering evaluation.
What is the Curie temperature of ferrite cores?
Ferrite loses its magnetic properties above the Curie temperature, typically 120–250°C depending on the grade. For applications with wide temperature swings, powder cores such as FeNi (operating to +180°C with stable permeability) may be a better fit.
Where are your ferrite cores manufactured?
Ferrite cores are manufactured in our own factory in Haining, Zhejiang, China, under IATF 16949 quality management. The factory covers material preparation, pressing, sintering and full-process testing, with in-house engineering for custom grade and geometry development.
What is the lead time for custom ferrite cores?
Lead time depends on geometry, material grade and tooling status. Standard parts ship from stock or short production cycles; custom tooling projects follow a confirmed schedule from the engineering evaluation. Share your frequency, power, size and volume targets to get a concrete timeline.
Do you supply ferrite cores to international customers?
Yes. We export ferrite cores and inductors worldwide, with English-speaking engineering and sales support, export packaging and documentation, and sample-first evaluation for new international customers.
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