| Image | Part Number | Description / PDF | Quantity | Rfq |
|---|---|---|---|---|
 |
TDK Corporation |
CMC 100MA 2LN 300 OHM SMD |
11578 |
|
 |
Schurter |
COMMON MODE CHOKE 50A 2LN TH |
417180 |
|
 |
KEMET |
CMC TROID, NI-ZN, 1.5UH, TH UL94 |
490 |
|
 |
J.W. Miller / Bourns |
CMC 10MH 1.5A 2LN SMD |
941 |
|
 |
J.W. Miller / Bourns |
CMC 3MH 350MA 2LN 3 KOHM SMD |
0 |
|
 |
Würth Elektronik Midcom |
CMC 6.8MH 1.3A 2LN TH |
0 |
|
 |
KEMET |
CMC 11.0MH 1.3A 0.19OHM WIDE IMP |
270 |
|
 |
KEMET |
CMC 1MH,2A, 0.1OHM |
200 |
|
 |
Laird - Performance Materials |
CMC 5A 2LN 300 OHM SMD |
10471 |
|
 |
J.W. Miller / Bourns |
CMC 50UH 800MA 2LN 1.5 KOHM SMD |
1705 |
|
 |
ITG Electronics, Inc. |
CMC 27MH 900MA 2LN TH |
45 |
|
 |
KEMET |
CMC 3MH,3A, 0.11OHM |
236 |
|
 |
KEMET |
CMC 4.3MH 1.7A 2LN TH |
800 |
|
 |
J.W. Miller / Bourns |
INDUCTOR COMMON MODE |
194 |
|
 |
Schurter |
COMMON MODE CHOKE 40A 2LN TH |
0 |
|
 |
Würth Elektronik Midcom |
CMC 3.3MH 2.25A 2LN SMD |
0 |
|
 |
TDK EPCOS |
CMC 39MH 1.2A 2LN TH |
5003 |
|
 |
KEMET |
CMC 600UH 3A 2LN TH |
1200 |
|
 |
J.W. Miller / Bourns |
CMC 3.6UH 1A 2LN 1.5 KOHM SMD |
0 |
|
 |
Triad Magnetics |
CMC 2.5MH 12.5A 2LN TH |
560 |
|
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.