| Image | Part Number | Description / PDF | Quantity | Rfq |
|---|---|---|---|---|
 |
KEMET |
CMC 23MH 700MA 2LN TH |
65 |
|
 |
KEMET |
COMMON MODE CHOKE 1MH 15A 2LN TH |
92 |
|
 |
KEMET |
CMC 2.4MH 1.7A 2LN TH |
0 |
|
 |
KEMET |
CMC 31MH 2.0A 0.214OHM HIGH IMPE |
197 |
|
 |
KEMET |
CMC 0.35MH,0.8A, 0.22OHM |
595 |
|
 |
KEMET |
CMC 7.6MH 2A 2LN TH |
0 |
|
 |
KEMET |
CMC 2.6MH 5A 0.027OHM WIDE IMPED |
189 |
|
 |
KEMET |
CMC 20MH 600MA 2LN TH |
0 |
|
 |
KEMET |
NMC, TROID, 6UH, 35OHM |
182 |
|
 |
KEMET |
CMC 500UH 1A 2LN TH |
0 |
|
 |
KEMET |
CMC 0.5MH,15A, 0.008OHM |
66 |
|
 |
KEMET |
CMC 14MH 500MA 2LN TH |
611 |
|
 |
KEMET |
COMMON MODE CHOKE 29MH 5A 2LN TH |
366 |
|
 |
KEMET |
CMC 49.5MH 0.5A 1.6OHM WIDE IMPE |
300 |
|
 |
KEMET |
CMC 59.5MH 0.5A 1.7OHM HIGH IMPE |
292 |
|
 |
KEMET |
CMC 0.05MH,60A, 0.00031OHM |
32 |
|
 |
KEMET |
CMC 28.4MH 700MA 2LN TH |
120 |
|
 |
KEMET |
CMC 135.0MH 0.4A 2.00OHM WIDE IM |
237 |
|
 |
KEMET |
NMC, TROID, 2.5UH, 25OHM |
1000 |
|
 |
KEMET |
NMC 64.0UH 1.0A 0.1100 OHM TH |
200 |
|
Common Mode Chokes (CMCs) are passive electronic components designed to suppress electromagnetic interference (EMI) by blocking high-frequency noise currents while allowing DC or low-frequency signals to pass. They play a critical role in ensuring electromagnetic compatibility (EMC) in modern electronic systems, particularly in power supplies, communication interfaces, and industrial equipment.
| Type | Functional Characteristics | Application Examples |
|---|---|---|
| High-Frequency CMCs | Optimized for >1 MHz noise suppression | Switching power supplies, USB interfaces |
| Low-Frequency CMCs | Effective in 10 kHz 1 MHz range | Motor drives, industrial sensors |
| Multi-Winding CMCs | Multiple coils for differential/balanced circuits | Telecom transformers, Ethernet interfaces |
| SMD CMCs | Surface-mount design for compact PCB integration | Smartphones, IoT devices |
| High-Current CMCs | Rated for >10A continuous operation | EV charging stations, solar inverters |
A typical CMC consists of: - Ferrite Core: Made of manganese-zinc (MnZn) or nickel-zinc (NiZn) materials for high permeability - Dual Windings: Symmetrically wound coils with equal turns to maintain signal integrity - Encapsulation: Flame-retardant epoxy resin for mechanical protection - Termination: Tin-plated copper leads or SMD pads
| Parameter | Description | Importance |
|---|---|---|
| Inductance (H) | 100 @ 100 MHz typical | Determines noise suppression effectiveness |
| Rated Current (A) | 0.1 50 A DC | Prevents core saturation under load |
| Impedance Range | 100 MHz 1 GHz | Defines operational frequency bandwidth |
| DC Resistance ( ) | 0.01 5 | Affects power efficiency |
| Operating Temp ( C) | -55 to +150 C | Ensures reliability in harsh environments |
Major industries include: - Consumer Electronics: Laptop chargers, smart TVs - Industrial Automation: PLC controllers, CNC machines - Medical Equipment: MRI scanners, patient monitors - Renewable Energy: Wind turbine inverters, battery storage systems - Telecommunications: 5G base stations, fiber optic transceivers
| Manufacturer | Product Series | Key Features |
|---|---|---|
| TDK Corporation | ACT1210 Series | 1200 @ 100 MHz, 1.5 A rating |
| Sumida | CDRH3D28 Series | High saturation resistance for EV chargers |
| Coilcraft | 114000C Series | AEC-Q200 qualified for automotive applications |
| W rth Elektronik | 744210 Series | Compact SMD design for 10GbE interfaces |
Key considerations: 1. Match impedance curve with target noise frequency 2. Derate current capacity by 20% for safety margins 3. Choose SMD variants for automated PCB assembly 4. Verify temperature ratings for industrial applications 5. Prioritize AEC-Q qualified parts for automotive use
Current trends include: - Miniaturization through advanced nanocrystalline cores - Integration with TVS diodes for combined EMI/surge protection - Development of 1000+ Amp CMCs for data center power systems - Adoption of RoHS-compliant materials - Implementation of embedded thermal sensors for smart monitoring
Application Case: A server power supply uses TDK ACT1210-600M CMC to suppress 150 MHz switching noise, achieving 40 dB reduction in conducted emissions.