Nanocrystalline cores
CMC (Common Mode Choke)
High-Permeability Nanocrystalline Cores For Automotive Filters
The Advanced Shield for Smart Vehicle Electronics
Engineered for extreme thermal stability and compact integration, our Common Mode Chokes (CMCs) provide the critical electromagnetic compatibility (EMC) required for the most demanding automotive ECUs, ADAS sensors, and high-speed communication bus systems.
Product Overview
CMC (Common Mode Choke) cores for automotive filters use reverse-wound coils on a single nanocrystalline core to effectively suppress EMI across a broad frequency range. During normal operation, opposing magnetic fields cancel out, allowing signal current to pass with minimal resistance, while common-mode noise generates high impedance for effective interference suppression. Compact, thermally stable, and highly efficient offering high permeability, low core loss, and reliable noise reduction.
Technical Specifications
Properties
| Properties | ||
|---|---|---|
| Nanocrystalline cores | Ferrite cores | |
| Saturation magnetic induction Bs（T) | ≥1.20T | 0.4 |
| Curie temperature（℃) | ≥560 | 170 |
| Saturation magnetism flexible coefficient（×10-6) | 2 | 4 |
| Operating Temperature Range | -55—130℃ | 80℃ |
| Initial permeability µ0 | 20000－160000 | 2000 |
| Coercivity A/m | 1.6 | 30 |
Specifications and Electrical Parameters
Test Conditions: 0.1V test signal, AL = Inductance for N=1 (Tolerance: +50% / –30%)
| Sr. | Nominal OD (mm) | Nominal ID (mm) | Nominal HT (mm) | Max OD (mm) | Min ID (mm) | Max HT (mm) | Protection Type | Core wt (g) | Ae (cm²) | Le (cm) | Wa (cm²) | AL (µH) at 10kHz/1V | AL (µH) at 100kHz/1V |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 7.2 | 4.5 | 3 | 8 | 3.5 | 4.5 | Plastic Case | 0.43 | 0.04 | 1.84 | 0.16 | 14.89 | 4.74 |
| 2 | 9.8 | 6.5 | 4.5 | 11.2 | 5.1 | 5.7 | Plastic Case | 1.1 | 0.07 | 2.56 | 0.33 | 22 | 5 |
| 3 | 10 | 6.5 | 5 | 11.2 | 5.1 | 6.5 | Plastic Case | 1.31 | 0.09 | 2.59 | 0.33 | 24 | 7.24 |
| 4 | 12 | 8 | 4.5 | 13.5 | 6.5 | 6.5 | Plastic Case | 1.64 | 0.09 | 3.14 | 0.5 | 25 | 6.13 |
| 5 | 12.5 | 10 | 5 | 14 | 8.5 | 6.8 | Plastic Casing | 1.28 | 0.06 | 3.53 | 0.79 | 11.78 | 3.57 |
| 6 | 14 | 10 | 5 | 15.5 | 8.5 | 6.8 | Plastic Case | 2.18 | 0.1 | 3.77 | 0.79 | 21 | 5.65 |
| 7 | 16 | 10 | 8 | 17.2 | 8.5 | 10 | Plastic Case | 5.67 | 0.24 | 4.08 | 0.79 | 40 | 12.63 |
| 8 | 16 | 12.5 | 6 | 17.8 | 10.7 | ≤8.0 | Epoxy Coated | 2.72 | 0.11 | 4.48 | 1.23 | 16 | 5.3 |
| 9 | 17.8 | 13 | 5 | 19.3 | 11.5 | 6.5 | Powder Coating | 3.36 | 0.12 | 4.84 | 2.86 | 16.34 | 5 |
Custom sizes available on request.
Key Features
1
High initial permeability and adjustable AL value (20,000–160,000)
Suitable for complex geometries and large production volumes
2
Excellent EMI suppression and wide frequency filtering
Free Cutting Brass Type I & II (IS 319 / BSS 249) + Custom AlloysFree Cutting Brass Type I & II (IS 319 / BSS 249) + Custom Alloys
3
High saturation flux density (≥1.20T) for compact choke design
CNC tolerance control for perfect alignment in plastic molding applications
4
Low core loss and small form factor with epoxy or plastic casing
Ideal for terminals, connectors, and grounding pins
5
High Curie temperature (≥560°C) and broad operating range (–55°C to 130°C)
Polished surfaces for better bonding and electrical contact
6
Corrosion Resistance
Suitable for use in humid or chemically exposed environments
Applications
1
Switched-mode power supplies (SMPS)
2
Common-mode noise suppression circuits
3
Automotive precision electronics
4
EMI harmonic filters for AC power grids
5
Single-phase and three-phase power line filters
6
General EMC applications across industries
Trust Reliability & Quality
With over 60 years of manufacturing excellence, PML delivers CMC for Automotive Filters trusted by OEMs and Tier 1 suppliers across sectors demanding robust performance.
ISO 45001
Occupational Health and Safety (OH&S) management systems
ISO 14001
Environmental Management Systems (EMS)
ISO 9001
Quality Management Systems (QMS)
IATF 16949
International Standard for Automotive Management Systems
AS 9100
Aerospace Quality Management System (QMS)
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