Amorphous E Cores
Sep 30, 2025
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What Are Amorphous E Cores
Amorphous E cores are precision-formed from ultra-thin amorphous metal strips, delivering outstanding magnetic performance in a wide range of high-frequency transformer and inductor applications. With their modular laminated structure, these cores offer low core losses, high magnetic flux density, and excellent thermal stability, making them the preferred choice for engineers building compact, high-efficiency power electronics. They are widely used in SMPS transformers, DC-DC converters, PFC chokes, industrial automation systems, and renewable energy power stages.
Features
High magnetic permeability for compact transformer design; excellent temperature stability under dynamic load conditions; low acoustic noise generation due to minimal magnetostriction; and multiple leg configurations available for three-phase systems.
Applications
Power supplies and inverters: used in compact, high-efficiency SMPS and inverter circuits, where modularity, high-frequency operation, and thermal stability are essential.
Industrial automation: ideal for programmable automation systems, motor drives, and control units requiring reliable inductance under dynamic operating conditions.
Telecommunication equipment: found in filters, isolation transformers, and line chokes within telecom infrastructure, supporting low-loss and stable high-frequency performance.
Renewable energy and EV power: support energy-efficient inverters and converters in solar systems, wind turbines, and electric vehicle applications.
Instrumentation and sensing: integrated in diagnostic equipment, current sensing modules, and magnetic shielding circuits where precision and low noise are critical.
Comparison of Amorphous Core Types
| Feature | Amorphous E core | Amorphous C core | Amorphous toroidal core |
|---|---|---|---|
| Shape | Modular E-lamination | Split rectangular C | Ring-shaped |
| Ease of winding | Easy (open slots) | Moderate | Hard (requires threading) |
| Mounting/assembly | Simple and stackable | Clamp-based | Often potted or clamped |
| Efficiency | High | Very high | Highest |
| Magnetic uniformity | Moderate | High | Excellent |
| Typical uses | SMPS, telecom, inverters | Transformers, energy | Chokes, EMI filters, CTs |
Specifications (Selected)
| Part no. | a (mm) | b (mm) | c (mm) | d (mm) | e (mm) | f (mm) | Weight (g) |
|---|---|---|---|---|---|---|---|
| CMCC-E001 | 15 | 25 | 47 | 30 | 95 | 77 | 891 |
| CMCC-E002 | 22 | 25 | 70 | 30 | 116 | 114 | 1743 |
| CMCC-E003 | 24 | 38 | 85 | 40 | 148 | 133 | 3139 |
| CMCC-E005 | 22 | 40 | 87 | 50 | 146 | 131 | 3643 |
| CMCC-E006 | 25 | 40 | 118 | 50 | 155 | 167.5 | 5016 |
| CMCC-E009 | 35 | 45 | 120 | 85 | 195 | 190 | 13435 |
Note: customized sizes are available.
Frequently Asked Questions
Q: What is an amorphous E core? A> A modular core formed from ultra-thin amorphous metal strip in an E shape for high-frequency transformers and inductors.
Q: Why are amorphous cores used? A> They offer very low core loss and high magnetic flux density, improving efficiency in power electronics.
Q: What is the advantage of the E shape? A> Open slots make winding easy and assembly simple and stackable.
Q: Where are amorphous E cores used? A> SMPS, DC-DC converters, PFC chokes, telecom, renewable energy, and EV power stages.
Q: How do E cores compare with toroidal cores? A> E cores are easier to wind and stack; toroidal cores offer the highest efficiency and magnetic uniformity but are harder to wind.
Q: Can sizes be customized? A> Yes, customized sizes are available to the design.
Need amorphous E cores for your design? Contact us with your part number or dimensions for a quotation.