Low Profile High Frequency EFD20 SMD Transformer for Compact Power Supply Unit
Industrial Performance Leader: EFD20 Series SMD High Frequency SMPS Transformer
Product Overview
The EFD20 series (Economical Flat Design) represents a significant evolutionary step in magnetic component engineering, specifically developed for high-density switching mode power supplies (SMPS) where vertical space is at a premium. As electronic devices transition toward "Slim-Profile" and "High-Power Density" designs, traditional EE or EF core transformers often fail to meet the height constraints of modern 1U server racks or slim-line power adapters.
Our CHIPSEN MTEFD20-951-14519 series is the flagship of this category, integrating advanced Mn-Zn ferrite core technology with precision SMD termination. Every unit is manufactured under strictly controlled environments to ensure reliable performance under extreme stress of 100kHz to 500kHz switching frequencies.
Key Features
- Ultra-Low Profile Footprint: Engineered for slim-line PCB layouts, minimizing overall thickness without sacrificing output capacity (10W-30W typical)
- Premium PC95 High-Frequency Core: Utilizes high-saturation magnetic flux density ferrite material maintaining low power loss at high temperatures
- Precision SMT Pin Coplanarity: Gull-wing SMD pins with coplanarity tolerance within 0.1mm for perfect solder joints
- Minimal Leakage Inductance: Proprietary sandwich winding techniques reduce EMI noise and protect switching MOSFETs
- Total Galvanic Isolation & Safety: Complies with UL (E332338) and IEC standards, withstands high-voltage surges (3750V AC+)
- Superior Acoustic Damping: Vacuum pressure impregnation process eliminates audible "whining" caused by magnetostriction
Technical Specifications
| Technical Attribute |
Industrial Specification / Engineering Value |
| Model Number |
MTEFD20-951-14519 Series |
| Magnetic Core Material |
Mn-Zn Ferrite PC95 (Low-Loss / High-Frequency) |
| Switching Frequency |
50kHz - 500kHz (Optimized for 100-200kHz) |
| Output Power Range |
10W - 30W (Depending on Cooling & Topology) |
| Primary Input Voltage |
85V - 265V AC (Universal Wide Range Input) |
| Secondary Output Voltage |
5V / 12V / 24V (Multi-Tap Customization Available) |
| Inductance (L) |
100uH - 2.5mH (Customizable per IC Requirements) |
| Hi-Pot / Isolation |
3750V AC / 50Hz / 60s (Primary to Secondary) |
| Leakage Inductance |
< 1% of Primary Inductance (@100kHz) |
| DC Resistance (DCR) |
Optimized for Low-Loss (Primary < 0.5Ω typical) |
| Insulation Class |
Class B (130°C) Standard / Class F (155°C) Available |
| Operating Temp Range |
-40°C to +125°C (Ambient + Temperature Rise) |
| Mounting Configuration |
Surface Mount (SMD Gull-wing Terminals) |
| Compliance Standards |
UL E332338 / RoHS / REACH / CE |
Engineering Advantages
The EFD20 features a planar-style horizontal bobbin design that allows for more turns of wire without increasing vertical stack. Made from high-strength phenolic resin or LCP (Liquid Crystal Polymer), it offers superior mechanical rigidity and high-temperature stability during 260°C reflow soldering.
Advanced winding and insulation geometry utilizes CNC-controlled automated winding machines with real-time tension monitoring. For high-frequency designs, we often utilize Triple Insulated Wire (TIW) for secondary winding, maximizing window fill factor while maintaining reinforced insulation.
The vacuum pressure impregnation (VPI) process bonds components into a solid, moisture-proof block, making units immune to humidity and corrosive industrial gases while eliminating audible noise.
Industry Applications
5G Telecommunications & Networking: Compact, highly efficient auxiliary power supplies for micro-cells, distributed gateways, and network switches with low EMI signature.
Portable Medical & Home-Healthcare: High-voltage isolation (3750V+) meets medical safety standards while maintaining slim-profile for portable devices with silent operation.
Internet of Things (IoT) & Smart Home: Compact AC-DC converters for smart plugs, home automation gateways, and security cameras with high efficiency for energy regulations compliance.
Company Profile
Chipsen Electronics is a professional manufacturer specializing in high-performance transformers and magnetic components, with more than 26 years of manufacturing expertise. Founded in 2000, we operate 4 production bases covering over 7,200 square meters with 400+ skilled employees.
We hold authoritative certifications including ISO9001, ISO14001 and IATF16949, with products approved by UL Class B/F/H, CQC, RoHS and REACH. Our portfolio includes 200+ product types with flexible custom development services.
Company Advantages
- Full Service Customization: Rapid design support within 24-48 hours
- Extensive Product Portfolio: 200+ product types including transformers, inductors, filters
- Advanced Manufacturing Capability: Automated winding and assembly machines
- Strict Quality Control System: 100% testing procedures
- High Voltage & High Frequency Expertise: 5KV to 40KV transformers
- Flexible MOQ & Fast Lead Time: 7 to 15 days lead time
- OEM/ODM Supported with Competitive Factory Direct Pricing
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 R&D team provides free technical support for customizations in voltage, power, inductance, dimensions, and core materials.
Do you accept flexible minimum order quantities?
We support flexible MOQ based on your industry and product requirements.
