EMI Filter & Common Mode Choke Cores
Superior noise suppression cores for EMI filters and common mode chokes. High permeability nanocrystalline materials for effective interference reduction in power electronics, EV chargers, and industrial drives.
What are EMI Filter & Common Mode Choke Cores?
EMI filter cores and common mode choke cores are magnetic components designed to suppress electromagnetic interference (EMI) in electronic circuits. Common mode chokes specifically block common-mode noise while allowing differential signals to pass through, making them essential for meeting EMC compliance standards.
Nanocrystalline cores provide superior performance compared to traditional ferrite cores, with much higher permeability (80k-90k μi) enabling effective noise suppression with fewer turns and smaller physical size.
Why Choose Nanocrystalline for EMI Suppression?
High Impedance at Interference Frequencies
Effective noise suppression with high common-mode impedance at critical frequencies.
Low Insertion Loss
Minimal impact on desired signals while blocking interference.
Excellent Temperature Stability
Stable performance across wide temperature ranges up to 130°C.
Compact Design
Space-efficient solutions for space-critical applications.
CMC Series Overview
Complete range of nanocrystalline common mode choke cores
| Core Code | Bare Core Size (mm) | Cased Size (mm) | Material | μi (typ) | AL (nH/N²) | Typical Line Current | Notes / Main Use |
|---|---|---|---|---|---|---|---|
| CC-NC-CMC-001-20 | 20×12×8 | 22.6×10.6×10 | Nanocrystalline | 80k-90k | Min 80k μi, AL=>60 | 5-15A | SMPS, small drives |
| CC-NC-CMC-002-25 | 25×16×10 | 27.5×13.8×12.6 | Nanocrystalline | 80k-90k | Min 80k μi, AL=>65 | 5-15A | SMPS, small drives |
| CC-NC-CMC-003-30A | 30×18×10 | 33×16.4×13.2 | Nanocrystalline | 80k-90k | Min 90k μi, AL=>59 | 10-30A | Industrial drives, EV chargers |
| CC-NC-CMC-004-30B | 30×20×15 | 33.6×17.7×17.8 | Nanocrystalline | 80k-90k | Min 90k μi, AL=>88 | 10-30A | Industrial drives, EV chargers |
| CC-NC-CMC-005-40 | 40×25×15 | 44.2×21.6×18.9 | Nanocrystalline | 80k-90k | Min 90k μi, AL=>100 | 30-80A | Solar inverters, high volume |
| CC-NC-CMC-006-40L | 40×32×15 | 43×29×18.8 | Nanocrystalline | 80k-90k | Min 90k μi, AL=>47 | 30-80A | Industrial drives, EV chargers |
CC-NC-CMC-001-20
20×12×8 mm
22.6×10.6×10 mm
80k-90k μi
Min 80k μi, AL=>60
CC-NC-CMC-002-25
25×16×10 mm
27.5×13.8×12.6 mm
80k-90k μi
Min 80k μi, AL=>65
CC-NC-CMC-003-30A
30×18×10 mm
33×16.4×13.2 mm
80k-90k μi
Min 90k μi, AL=>59
CC-NC-CMC-004-30B
30×20×15 mm
33.6×17.7×17.8 mm
80k-90k μi
Min 90k μi, AL=>88
CC-NC-CMC-005-40
40×25×15 mm
44.2×21.6×18.9 mm
80k-90k μi
Min 90k μi, AL=>100
CC-NC-CMC-006-40L
40×32×15 mm
43×29×18.8 mm
80k-90k μi
Min 90k μi, AL=>47
Typical Applications
Power Electronics
Switch-mode power supplies, motor drives, and inverter EMI filtering
Automotive Systems
EV charging systems, DC-DC converters, and onboard charger EMI suppression
Solar Inverters
AC and DC side EMI filters meeting CISPR / EN55011/22 limits
Industrial Drives
Variable frequency drives reducing conducted emissions on input and output lines
Frequently Asked Questions
What is the difference between EMI filter cores and common mode choke cores?
EMI filter cores are magnetic cores used in EMI filters to suppress electromagnetic interference. Common mode choke cores are a specific type of EMI filter core designed to block common-mode noise while allowing differential signals to pass through, making them essential for meeting EMC compliance standards.
Why use nanocrystalline cores for EMI suppression?
Nanocrystalline cores provide much higher permeability (80k-90k μi) compared to ferrite, enabling higher impedance at lower turn counts. They also offer better performance at elevated temperatures and higher saturation flux density (1.2T vs 0.4T for ferrite).
Need EMI Filter Core Design Support?
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