Ferrite Core (MnZn EE55)

Description

1. Product Overview

The MnZn EE55 Ferrite Core is a precision-engineered magnetic component optimized for high-efficiency power conversion in switched-mode power supplies (SMPS) and high-frequency transformers. Its primary industrial use lies in reducing eddy current losses and improving electromagnetic interference (EMI) performance in power electronics operating between 20 kHz and 500 kHz. Strategically, this core is critical as global industries transition toward higher power density and energy-efficient systems—directly impacting operational uptime, thermal management, and regulatory compliance (e.g., Energy Star, DOE Level VI).

2. Key Specifications & Technical Characteristics

• Material Composition: Manganese-Zinc (MnZn) ferrite; main oxides: Fe₂O₃ (approx. 70%), MnO (approx. 25%), ZnO (approx. 5%)

• Initial Permeability (μi): 2300 ± 25% (at 25°C, 10 kHz)

• Saturation Flux Density (Bs): 510 mT (at 25°C, 1 kHz); 410 mT (at 100°C)

• Curie Temperature (Tc): > 215°C

• Power Loss (Pcv): ≤ 110 kW/m³ (100 kHz, 200 mT, 100°C)

• Physical Form: EE55 geometry – two identical E-shaped halves, center leg length 55 mm, UL 94 V-0 compliant coating (optional: uncoated)

• Color: Dark gray / matte black (standard)

• Density: 4.9 g/cm³ ± 0.2

• Packaging: Anti-static PE bags + corrugated cartons (standard); vacuum-sealed moisture barrier bags for high-humidity logistics

• Shelf Life: 24 months from date of manufacturing (≤ 35°C, ≤ 65% RH, no corrosive atmosphere)

3. Core Industrial Applications

• Primary industries: Industrial automation, EV on-board chargers (OBCs), telecom rectifiers, medical imaging power supplies, solar inverters

• Specific use cases:

  • SMPS transformers for 500W–5kW power supplies

  • Gate drive transformers in high-noise industrial environments

  • Common-mode chokes for EMI filtering in motor drives

• Performance vs. alternatives: Compared to powdered iron cores or lower-grade MnZn (e.g., PC40 class), the EE55 achieves 15–20% lower core loss at 100°C and higher saturation flux density, reducing transformer temperature rise by up to 12°C. This extends capacitor and MOSFET lifetimes in high-duty-cycle applications.

• Cost advantage: Standardized EE55 geometry allows direct drop-in replacement without PCB redesign, cutting retooling costs by >40% versus custom geometries.

4. Competitive Advantages

• Quality consistency: Process Capability Index (Cpk) > 1.33 for inductance tolerance across 20+ batches; 100% impedance tested at 25°C and 100°C.

• Supply reliability: Two dedicated MnZn production lines with 45-day raw material buffer; <0.3% historical delivery delay rate.

• Logistics capability: Global hub stocking in Rotterdam, Shanghai, and Houston – 7-day express air or 21-day sea freight to tier-1 manufacturing zones.

• Price competitiveness: Volume pricing 8–12% below comparable TDK or Ferroxcube equivalents for annual orders >50,000 pieces.

• Environmental & technical support: RoHS and REACH compliant; full impedance, B-H loop, and loss characterization data provided in downloadable PDF/CSV format; application engineering support for gapping and winding optimization included.

5. Commercial & Supply Information

• Minimum Order Quantity (MOQ): 20 metric tons (MT) – equivalent to approx. 55,000–60,000 matched EE55 core sets (depending on coating and gapping)

• Loading capacity: 20 MT per standard 20-ft dry container (palletized, 1,200 mm × 1,000 mm footprint, stack height ≤ 1.2 m)