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Stable Low Loss Ferrite EF25 SMPS Transformer for High Voltage Power Application
Place of Origin:
China
Brand Name:
CHIPSEN
Certification:
ISO9001:2015, IATF16949:2016, U/L, ROHS, CQC, CE, cUL
Model Number:
EF25
Minimum Order Quantity:
500pcs
Price:
＄3.5-5.8/pieces,1000-10000pcs
Packaging Details:
Blister trays + export cartons; palletized for bulk orders. Safe for stable transit. Custom available.
Delivery Time:
7-14 work days (Negotiable)
Payment Terms:
T/T
Supply Ability:
1000pcs
Inquiry Now
Get A Quote
Specifications
Highlight Features
EF25 SMPS transformer high voltage
,ferrite flyback transformer stable
,low loss EF25 power transformer
Certification:
ISO9001 2015, IATF16949 2016, UL, ROHS, CE, CUL
Frequency:
20kHz - 300kHz High Frequency EF25 Transformer
Output Power:
20W - 60W
Components:
Ferrite Core, Bobbin, Copper Wire
Bobbin Material:
Bakelite / Phenolic / Plastics OEM/ODM Acceptable
Warranty:
5 Years
Pin:
5+5 Pins EF25 High Frequency Transformer
Highlight:
High Conversion Efficiency Cost-effective Compact Design Stable High-frequency Performance
Product Description
Stable Low Loss Ferrite EF25 SMPS Transformer for High Voltage Power Application
Technical Specification & Showcase: EF25 Series High-Efficiency SMPS Transformer
Product Introduction & Strategic Selling Points
The EF25 High Frequency Transformer, exemplified by the EF25-282-13607 industrial series, represents a cornerstone of modern power electronics. Designed for high-density Switching Mode Power Supplies (SMPS), the "EF" topology is celebrated for its balanced magnetic path and cost-effective performance. The "25" designates its 25mm core width, a form factor specifically engineered to provide an optimal equilibrium between power handling (typically 20W to 60W depending on the switching frequency) and vertical footprint.
Every EF25 unit from our production line is built upon a foundation of magnetic material science. By utilizing advanced Mn-Zn (Manganese-Zinc) ferrite materials that offer high saturation magnetic flux density (Bs) and exceptionally low power loss at elevated temperatures, the EF25 ensures that your system operates with maximum efficiency. Unlike standard transformers, the EF25 series is optimized for frequencies ranging from 20kHz to 300kHz, allowing for rapid energy transfer with minimal heat buildup.
Key Selling Points
- High-Permeability Magnetic Core: Utilizing high-grade ferrite materials designed for low hysteresis loss, ensuring efficiency even under continuous full-load operation in hot environments
- 100% Pure Oxygen-Free Copper Windings: High-purity copper wire ensures the lowest possible DC resistance (DCR), reducing copper losses and improving thermal management
- Minimal Leakage Inductance: Proprietary sandwich winding techniques achieve exceptionally low leakage inductance (typically <1% of primary inductance), reducing voltage spikes and protecting switching MOSFETs
- Superior Thermal Dissipation Geometry: EF core structure provides large external surface area for excellent natural convection cooling without bulky external heatsinks
- Robust Industrial Pin Design: Tinned copper pins ensure perfect solderability and high mechanical strength for high-vibration environments
- Total Galvanic Isolation & Safety: Engineered with high-spec insulation barriers and vacuum-impregnated varnish, withstanding high-voltage grid transients
- Customizable Power Profiles: Engineering team can fine-tune turns ratio and inductance values to match specific IC controller requirements
Detailed Technical Parameters & Engineering Analysis
The technical profile of the EF25 is defined by its precision. The following table provides the foundational specifications for our standard industrial series, which are fully customizable based on your specific power stage and switching frequency requirements.
| Technical Attribute | Detailed Specification & Value |
|---|---|
| Model Designation | EF25-282-13607 Switching Series |
| Magnetic Core Material | High-Frequency Low-Loss Mn-Zn Ferrite |
| Primary Input Voltage | 85V - 265V AC (Universal Wide Range) |
| Secondary Output Voltage | 3.3V / 5V / 12V / 24V / 48V (Customizable) |
| Rated Power Capacity | 20W - 60W (Frequency Dependent) |
| Working Frequency Range | 20kHz - 300kHz (Optimized for Switching) |
| Hi-Pot Isolation Strength | 3750V AC / 50Hz / 60s (Primary to Secondary) |
| Leakage Inductance (Llk) | < 1% of Primary Inductance (@100kHz) |
| Insulation Class | Class B (130°C) Standard / Class F (155°C) Available |
| Operating Temperature | -40°C to +125°C (Including Temperature Rise) |
| Bobbin Material | Flame-Retardant Phenolic / PBT (High Stability) |
| Mounting Configuration | Vertical Through-Hole (5+5 Tinned Pins) |
| Compliance Standards | RoHS / REACH / CE / International Safety Approval |
Parameter Analysis & Engineering Insight: For power supply engineers, the Leakage Inductance control of the EF25 is perhaps its most critical performance metric. High leakage inductance stores energy that must be dissipated by a snubber circuit, leading to heat and EMI (Electromagnetic Interference). Our EF25 series utilizes a "Sandwich Winding" approach—placing the secondary winding between two halves of the primary—to maximize magnetic coupling.
Furthermore, the Dielectric Strength of 3750V AC ensures that the transformer acts as an impenetrable isolation barrier between the dangerous high-voltage mains and the user-accessible low-voltage side. The Working Frequency range of up to 300kHz allows for the use of smaller output filter capacitors, reducing the total bill-of-materials (BOM) cost and size of the final product.
Product Features & Advanced Manufacturing Advantages
High-Grade Magnetic Material Selection
We source materials with a very narrow hysteresis loop, reducing energy lost during every magnetic reversal cycle. Cores are precision-ground to ensure mating surfaces have flatness within microns, minimizing unintentional air gaps.
Precision Automated Winding
CNC-controlled winding machines ensure perfect tension and layer alignment of copper wire, preventing wire crossing that can lead to localized hot spots and insulation wear over time.
Triple Insulated Wire (TIW)
For high-voltage or high-safety applications, we offer TIW for secondary windings, achieving reinforced insulation without thick margin tapes and maximizing Window Fill Factor.
Vacuum Pressure Impregnation (VPI)
Transformers are submerged in a vacuum chamber where air is removed from microscopic gaps, then high-grade insulating varnish is forced into these spaces, creating a solid, monolithic block.
Mechanical Ruggedness
Bobbins are made from reinforced, high-temperature phenolic resin that resists warping during wave soldering. Oversized tinned pins ensure excellent solderability and mechanical stability.
Strategic Product Applications across Industries
Consumer Electronics & Home Office
Primary power conversion element for laptop adapters, high-end monitor power boards, and smart TV power modules. Ideal for latest USB-C Power Delivery (PD) standards with compact size and low EMI signature.
Industrial Automation & Control
Used in PLC power supplies, motor drive control boards, and industrial sensor modules. High-temperature insulation and rugged vertical mounting enable 24/7 operation in harsh factory settings.
Telecommunications & IoT Infrastructure
Relied upon for high-efficiency auxiliary power in 5G small-cell base stations and network gateways. Maintains efficiency over 90% in convection-cooled environments with long service life.
Renewable Energy & Smart Grid
Used in solar inverter control boards and battery energy storage management units. Provides reliable auxiliary power for monitoring sensors and communication modules in outdoor cabinets with extreme temperature swings.
Company Introduction & Quality Assurance
Chipsen Electronics is a professional manufacturer specializing in high-performance transformers and magnetic components, with more than 26 years of in-depth manufacturing expertise. Founded in 2000, we now operate 4 production bases covering over 7,200 square meters with over 400 skilled employees.
We hold authoritative certifications including ISO9001, ISO14001 and IATF16949. Our products are approved by UL Class B/F/H, CQC, RoHS and REACH. We have obtained 36+ utility patents, supported by our robust in-house R&D team.
Company Advantages
Full Service Customization
Rapid design support within 24 to 48 hours based on your drawings or specifications, from concept to mass production.
Extensive Product Portfolio
200+ product types including high frequency transformers, toroidal transformers, flyback transformers, inductors, filters, and common mode chokes.
Advanced Manufacturing
Automated winding and assembly machines improve efficiency by up to 8x while maintaining consistent product quality.
Strict Quality Control
100% testing procedures including electrical performance, insulation, and reliability tests to ensure compliance with international standards.
High Voltage Expertise
Specialized in 5KV to 40KV high voltage transformers and high-frequency power solutions with low loss and high efficiency.
Flexible MOQ & Fast Lead Time
Support from prototype orders to bulk production with lead times as fast as 7 to 15 days.
Our Mission
To deliver reliable energy efficient transformer solutions that empower our customers products and enhance their market competitiveness worldwide.
Frequently Asked Questions
How long does it take to prepare samples?
3-5 days for new samples, 1 day for samples in stock.
How are samples shipped?
When customers cover freight costs, we help choose the most economical shipping method.
Do you provide technical support for customized products?
Yes, our strong R&D team provides free technical support for customizations in voltage, power, inductance, dimensions, core materials, and more.
Do you accept flexible minimum order quantities?
We support flexible MOQ based on your industry and product requirements. Please share your application areas and estimated annual usage.
Can you ensure proper packaging for large sea shipments?
Yes, we provide goods packed in strong export cartons, on wooden pallets, and shrink-wrapped for protection.
Product Images
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