Hangzhou Kefeng Electronics Co., LTD
| Tolerance | 20% |
| Supplier Type | Factory direct sale |
| Package Type | Carton |
| Material | NiZn |
| Application | Electronic and electrical equipment |
| Usage | chokes |
| Type | Soft |
| Brand | Careful |
| Operating Temperature | Carton |
| Package / Case | As the customer required |
| Frequency | 0.1-500mhz |
| Model Number | R |
| Certification | ISO9001:2015;ROHS;REACH |
| Brand Name | Careful |
| Place of Origin | Zhejiang, China |
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Product Specification
| Tolerance | 20% | Supplier Type | Factory direct sale |
| Package Type | Carton | Material | NiZn |
| Application | Electronic and electrical equipment | Usage | chokes |
| Type | Soft | Brand | Careful |
| Operating Temperature | Carton | Package / Case | As the customer required |
| Frequency | 0.1-500mhz | Model Number | R |
| Certification | ISO9001:2015;ROHS;REACH | Brand Name | Careful |
| Place of Origin | Zhejiang, China | ||
| High Light | MnZn ferrite rod PC40 grade ，Custom 28x140mm ferrite rod ，EMI suppression ferrite rod | ||
MnZn PC40 / PC95 Ferrite Rod Core — Anti-Interference Magnetic Bar. High-quality 28×140mm custom non-standard ferrite rod cores engineered for effective EMI noise suppression in electronic circuits. Ideal for choke coils, EMI filters, and industrial magnet applications requiring stable performance across 0.1–500 MHz.
| Place of Origin | China, Zhejiang |
|---|---|
| Brand Name | Careful |
| Model Number | R type |
| Type | Soft |
| Composite | Ferrite Magnet |
| Shape | Bar / Rod |
| Application | Industrial Magnet |
| Tolerance | ±10% |
| Certification | ISO9001:2015; ROHS; REACH |
| Usage | Choke coil |
| Frequency | 0.1–500 MHz |
| Material | MnZn Ferrite Core (PC40 / PC95 grade) |
| Specifications | A (mm) | B (mm) | C (mm) | D (mm) |
|---|---|---|---|---|
| RID 2×2.3×3.5 | 2±0.3 | 2.3±0.3 | 3.5±0.3 | 1±0.3 |
| RID 3.5×2×1.3 | 3.5±0.3 | 2±0.3 | 1.3±0.3 | 0.8±0.3 |
| RID 3.5×2×2 | 3.5±0.3 | 2±0.3 | 2±0.3 | 0.8±0.3 |
| RID 3.5×2×2 | 3.5±0.3 | 2±0.3 | 2±0.3 | 1.2±0.3 |
| RID 3.5×2×2.4-0.8 | 3.5±0.3 | 2±0.3 | 2.4±0.3 | 0.8±0.3 |
| RID 4×7×3-2.2 | 4±0.3 | 7±0.3 | 3±0.3 | 2.2±0.3 |
| RID 4.1×6.9×6.6 | 4.1±0.3 | 6.9±0.4 | 6.6±0.4 | 1.8±0.3 |
| RID 4.6×8.8×5-2.3 | 4.6±0.3 | 8.8±0.3 | 5±0.3 | 2.3±0.3 |
| RID 5×3×3 | 5±0.4 | 3±0.3 | 3±0.3 | 1.2±0.3 |
| RID 5.2×3×2-1 | 5.2±0.3 | 3±0.3 | 2±0.3 | 1±0.3 |
* Complete dimensional specifications and custom sizes are available upon request.
CAREFUL ferrite cores convert interference into trace heat, instantly cleaning power and signal lines for fast FCC, CE, and CISPR compliance — eliminating USB/HDMI/Ethernet errors without PCB redesigns.
MnZn cores deliver high permeability (>10,000) and B > 400 mT, minimizing loss in SMPS, PFC, and DC-DC below 500 kHz. NiZn beads offer high resistivity with 1–300 MHz attenuation for optimized signal integrity.
Sintered cores maintain stable properties in harsh environments. High Curie points and corrosion-resistant finishes suit automotive, industrial, and outdoor telecom cabinets.
2000+ specifications including toroidal cores, split/clamp-on cores for tool-free retrofitting, and SMD chip beads for automation. Smooth edges protect insulation.
100% tested for AL, L, and Q. RoHS, REACH, and HF compliant. Lower loss enables smaller heat sinks and compact designs, optimizing BOM cost effectively.
Reduces skin effect and supports high current applications effectively.
Customizable wire gauge options including 0.13mm, 0.15mm, 0.2mm, and 0.3mm.
Available in both vertical and horizontal through-hole configurations for diverse PCB layouts.
Delivers excellent common-mode noise suppression and improves overall EMC performance.
Standard specifications can be tailored to meet specific client requirements with flexible engineering support.
Since establishment, Careful has implemented a comprehensive quality control system and achieved ISO9001 certification. We continuously improve our management and product quality to meet customer requirements.
Our excellent product quality has led to steadily increasing market share, with sales growing by 100% annually. We have earned a strong reputation among customers and become a preferred supplier for many leading companies.
"To pursue the perfection of details, the efficiency of execution" is our corporate slogan. Careful professionals work diligently with domestic and international partners to create a bright future.
CAREFUL Group is a national high-tech enterprise specializing in the R&D, manufacturing, and customization of EMC & EMI magnetic components. As the designated implementer of the National Torch Program (Project No. 2007GH030199) for copper-zinc RF interference-suppression materials, we combine proprietary core technologies with large-scale automated production to deliver stable, cost-competitive EMI solutions for global electronics manufacturers.
Driven by precision manufacturing, efficient delivery, and continuous innovation, CAREFUL fully complies with RoHS, REACH, and internationally recognized quality management systems.
Soft/Hard Ferrites, Mn-Zn, Mg-Zn, Ni-Zn, Amorphous, Nanocrystalline, Sintered Magnets & NdFeB.
To ensure the safety of your goods, we provide professional, environmentally friendly, convenient, and efficient packaging services.
Based in Zhejiang, China since 2001, we serve domestic and international markets including Eastern Europe, South Asia, Eastern Asia, North America, and Europe. Our organization employs over 1000 professionals.
We conduct pre-production sampling before mass production and perform final inspection before shipment to ensure consistent quality standards.
We specialize in Soft Ferrite Cores, Amorphous cores, Inductors, and NiZn ferrite components.
As China's largest ferrite core manufacturer with over 30 years of experience, we supply major companies including Microsoft, GREE, Midea, SAMSUNG, and ASUS.
We accept various delivery terms (FOB, CFR, CIF, EXW, Express Delivery) and payment methods (T/T, L/C, PayPal, Escrow) in USD or CNY. Our team communicates in English and Chinese.
Company Details
Business Type:
Manufacturer,Distributor/Wholesaler,Agent,Importer,Exporter,Trading Company,Seller
Year Established:
1987
Total Annual:
25000000-30000000
Employee Number:
>300
Ecer Certification：
Verified Supplier
Careful Magnetism Co., Ltd. is a leading corporation with over 20 years of experience in Ferrite Core manufacturing. Established in 2001 as Huzhou Cifeng Industry Corporation, a key enterprise in Huzhou City, we have been recognized as a "High and New Technology Enterprise in Zhejiang Province.... Careful Magnetism Co., Ltd. is a leading corporation with over 20 years of experience in Ferrite Core manufacturing. Established in 2001 as Huzhou Cifeng Industry Corporation, a key enterprise in Huzhou City, we have been recognized as a "High and New Technology Enterprise in Zhejiang Province....
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