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Amorphous C-Cores
Ultra-low loss amorphous alloy C-cores engineered for high-efficiency switch-mode power supplies, inverters, and renewable energy systems where minimal core losses and reduced size are essential.
Custom GOSS Toroidal Cores -Standard & Large High-Power Designs
Bridgeport Magnetics supplies ultra-low loss amorphous alloy C-cores for high-efficiency applications. Most sizes are in stock for same-day shipping. These cores deliver approximately 50% lower core weight and volume, significantly lower core losses, and smaller overall designs compared to silicon steel, ferrite, and powdered iron cores – making them ideal for switch-mode power supplies, inverters, UPS systems, and renewable energy applications.
Why Choose Amorphous C-Cores for High-Efficiency Applications
Amorphous alloy C-cores deliver ultra-low core losses and significantly higher efficiency compared to traditional silicon steel, ferrite, and powdered iron cores. Their thin lamination thickness (0.001″) and high saturation induction enable smaller, lighter, and cooler-running designs in medium-to-high frequency applications.
For engineers designing high-efficiency power electronics, this translates to:
- Dramatically lower core losses for improved system efficiency
- Smaller and lighter overall designs (up to 50% reduction in weight and volume)
- Reduced temperature rise, allowing more compact cooling solutions
- Excellent performance in switch-mode power supplies, inverters, and UPS systems
- Wide operating temperature range (-55°C to 130°C)
Specifications
| Core No. | CORE DIMENSION | PERFORMANCE PARAMETERS | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A (m m) | ± | B (mm) | ± | E (mm) | ± | F (mm) ref* | G (mm) ref* | D (mm) | ± | lm (cm) | Ac (cm2) | Wa (cm2) | Ap (cm4) | Mass (g) | |
| BMCC4 | 28 | 1.5 | 50.8 | 1.3 | 9 | 0.5 | 10 | 32.8 | 15 | 0.5 | 12.2 | 1.1 | 3.3 | 3.6 | 99 |
| BMCC6.3 | 31 | 1 | 53 | 2 | 10 | 0.5 | 11 | 33 | 20 | 0.5 | 12.8 | 1.6 | 3.6 | 6 | 154 |
| BMCC8 | 35 | 1 | 52 | 2 | 11 | 0.8 | 13 | 30 | 20 | 0.5 | 13 | 1.8 | 3.9 | 7 | 172 |
| BMCC10 | 35 | 1 | 62 | 2 | 11 | 0.8 | 13 | 40 | 20 | 0.5 | 15.4 | 1.8 | 5.2 | 9.4 | 198 |
| BMCC16A | 35 | 1 | 62 | 2 | 11 | 0.8 | 13 | 40 | 25 | 0.5 | 15.1 | 2.3 | 5.2 | 11.7 | 248 |
| BMCC16B | 35 | 1 | 72 | 2 | 11 | 0.8 | 13 | 50 | 25 | 0.5 | 17 | 2.3 | 6.5 | 14.7 | 281 |
| BMCC20 | 35 | 1 | 72 | 2 | 11 | 0.8 | 13 | 50 | 30 | 0.5 | 17.5 | 2.7 | 6.5 | 17.6 | 337 |
| BMCC25 | 41 | 1 | 82 | 2 | 13 | 0.8 | 15 | 56 | 25 | 0.5 | 19.6 | 2.7 | 8.4 | 22.4 | 379 |
| BMCC32 | 41 | 1 | 82 | 2 | 13 | 0.8 | 15 | 56 | 30 | 0.5 | 20 | 3.2 | 8.4 | 26.9 | 454 |
| BMCC40 | 41 | 1 | 82 | 2 | 13 | 0.8 | 15 | 56 | 35 | 0.5 | 19.9 | 3.7 | 8.4 | 31.3 | 530 |
| BMCC50 | 52 | 1 | 102 | 3 | 16 | 1 | 20 | 70 | 25 | 0.5 | 24.9 | 3.3 | 14 | 45.9 | 586 |
| BMCC63 | 52 | 1 | 102 | 3 | 16 | 1 | 20 | 70 | 30 | 0.5 | 25.3 | 3.9 | 14 | 55.1 | 703 |
| BMCC80 | 52 | 1 | 102 | 3 | 16 | 1 | 20 | 70 | 40 | 1 | 25.4 | 5.2 | 14 | 73.5 | 938 |
| BMCC100 | 52 | 1 | 102 | 3 | 16 | 1 | 20 | 70 | 45 | 1 | 25 | 5.9 | 14 | 82.7 | 1,055 |
| BMCC168S | 70.5 | 1.3 | 195 | 3 | 20.4 | 0.5 | 30 | 154.2 | 20 | 0.5 | 45.4 | 3.4 | 45.8 | 153.2 | 1,101 |
| BMCC125 | 63 | 1 | 121 | 3 | 19 | 1 | 25 | 83 | 35 | 1 | 30.2 | 5.5 | 20.8 | 113.1 | 1,166 |
| BMCC160 | 63 | 1 | 121 | 3 | 19 | 1 | 25 | 83 | 40 | 1 | 28.5 | 6.2 | 20.8 | 129.3 | 1,333 |
| BMCC200 | 63 | 1 | 121 | 3 | 19 | 1 | 25 | 83 | 50 | 1 | 29.8 | 7.8 | 20.8 | 161.6 | 1,666 |
| BMCC367S | 117.6 | 1.5 | 149.4 | 1.5 | 25.8 | 1 | 67 | 97.8 | 25 | 0.7 | 43.8 | 5.3 | 63.8 | 340.1 | 1,668 |
| BMCC250 | 63 | 1 | 128 | 3 | 19 | 1 | 25 | 90 | 60 | 1 | 31.4 | 9.3 | 22.5 | 210.3 | 2,095 |
| BMCC320 | 79 | 1 | 129 | 4 | 22 | 1 | 35 | 85 | 50 | 1 | 32.5 | 9 | 29.8 | 268.3 | 2,167 |
| BMCC400 | 79 | 1 | 129 | 4 | 22 | 1 | 35 | 85 | 65 | 1 | 33.6 | 11.7 | 29.8 | 348.8 | 2,817 |
| BMCC500 | 90 | 1 | 135 | 4 | 25 | 1 | 40 | 85 | 55 | 1 | 35.6 | 11.3 | 34 | 383.4 | 2,890 |
| BMCC630 | 90 | 1 | 135 | 4 | 25 | 1 | 40 | 85 | 70 | 1 | 35.6 | 14.3 | 34 | 487.9 | 3,678 |
| BMCC800A | 90 | 1 | 135 | 4 | 25 | 1 | 40 | 85 | 85 | 1.5 | 35.6 | 17.4 | 34 | 592.5 | 4,466 |
| BMCC800B | 100 | 1 | 155 | 4 | 30 | 1 | 40 | 95 | 85 | 1.5 | 39.3 | 21 | 38 | 794.6 | 5,972 |
| BMCC1000 | 106 | 1 | 171 | 5 | 33 | 1 | 40 | 105 | 85 | 1.5 | 42.7 | 23 | 42 | 966 | 7,109 |
Applications & Advantages of Amorphous C-Cores
Amorphous C-Cores are engineered for high-efficiency medium-to-high frequency applications where ultra-low core losses and compact design are critical. They outperform traditional silicon steel, ferrite, and powdered iron cores in weight, size, and thermal performance.
Key Applications
- Transformer cores in switch-mode power supplies (400 – 20,000 Hz)
- Inverters for welding equipment, wind turbines, and solar panels
- Output filter chokes in large switching-mode power supplies
- UPS harmonic inductors
- High-power ballasts
- Power Factor Correction (PFC) chokes in UPS systems
Advantages Over Silicon Steel, Ferrite & Powdered Iron Cores
| Advantage | Benefit |
|---|---|
| ~50% Lower Core Weight & Volume | Higher saturation induction allows significantly smaller and lighter designs |
| Ultra-Low Core Losses | 1 mil (25 µm) lamination thickness dramatically reduces losses |
| Smaller Overall Design | Lower temperature rise enables more compact cooling and packaging |
| Fast Assembly | Easily assembled into pre-wound coils |
| Adjustable Air Gap | Air gap can be easily set for specific inductance requirements |
| Wide Temperature Range | Reliable operation from -55°C to 130°C |
Key Material Properties
| Property | Value |
|---|---|
| Saturation Induction | 1.56 Tesla |
| Magnetostriction at Saturation | 27 ppm |
| Resistivity | 130 µΩ·cm |
| Lamination Thickness | 0.001″ (25 µm) |
| Density | 7.28 g/cm³ |
| Crystallization Temperature | 508°C |
| Curie Temperature | 399°C |
Amorphous C-cores shine in ultra-low core loss, lighter, and highly efficient applications.
High-Frequency Switch Mode Power Supplies
Ultra-low loss SMPS transformers 400Hz–20kHz
Renewable Energy Inverters
Solar and wind power inverter transformers
Battery Energy Storage Systems (BESS)
High-efficiency BESS inverter and converter cores
UPS Systems and Power Conditioning
UPS harmonic inductors and PFC chokes
Industrial Welding and Power Electronics
High-power welding inverter and industrial transformers
Let's build yours to spec.
Custom magnetics engineered and manufactured in the USA. Tell us your requirements and our engineers will help.
Frequently Asked Questions
What are amorphous C-cores and why are they better than silicon steel?
Amorphous C-cores are made from ultra-thin (0.001″) metallic glass alloy with no crystalline structure. This results in significantly lower core losses, higher saturation induction (1.56 T), and up to 50% smaller and lighter designs compared to traditional grain-oriented silicon steel cores.
What frequency range are amorphous C-cores best suited for?
Amorphous C-cores perform exceptionally well in medium-to-high frequency applications, typically from 400 Hz to 20,000 Hz. They are ideal for switch-mode power supplies, inverters, and high-frequency transformers where low core loss is critical.
What are the main applications for amorphous C-cores?
They are widely used in high-efficiency switch-mode power supplies, solar and wind inverters, BESS converters, UPS harmonic inductors, power factor correction chokes, welding equipment, and high-power output filter chokes.
How do amorphous C-cores compare to ferrite cores?
Amorphous C-cores offer much higher saturation flux density than ferrite, allowing smaller core sizes for the same power level. They also provide better thermal stability and a wider operating temperature range (-55°C to 130°C) while maintaining very low core losses at medium frequencies.
What are the key advantages of using amorphous C-cores in UPS and inverter designs?
Amorphous C-cores deliver lower core losses, reduced temperature rise, and smaller overall size and weight. This results in higher system efficiency, more compact designs, and easier assembly into pre-wound coils with adjustable air gaps.
Are amorphous C-cores suitable for high-power renewable energy applications?
Yes. Their combination of low core losses, high saturation induction, and thermal stability makes them an excellent choice for solar inverters, wind turbine converters, and Battery Energy Storage System (BESS) power electronics where efficiency and power density are critical.
