Common Mode Chokes

Image	Part Number	Description / PDF	Quantity	Rfq
	PE-0805CCMC181STH PulseLarsen Antenna	CMC 250MA 2LN 180 OHM SMD	0
	23Z109SMNL PulseLarsen Antenna	COMMON MODE CHOKE 10LN SMD	0
	PE-53914 PulseLarsen Antenna	COMMON MODE CHOKE 500MA 2LN SMD	0
	PE-67539 PulseLarsen Antenna	COMMON MODE CHOKE 4LN TH	0
	FE2X27-4-2 PulseLarsen Antenna	COMMON MODE CHOKE 700MA 2LN TH	0
	PE-0302MCMC470MT PulseLarsen Antenna	CMC 100MA 2LN 47 OHM SMD	0
	PE-67540 PulseLarsen Antenna	COMMON MODE CHOKE 4LN SMD	0
	T8114ANLT PulseLarsen Antenna	CMC 4.7MH 2LN 400 OHM SMD	0
	FE2X47-3-2 PulseLarsen Antenna	COMMON MODE CHOKE 300MA 2LN TH	0
	HM6902NLT PulseLarsen Antenna	CMC 2LN SMD AEC-Q200	0
	PE-0403MCMC400ST PulseLarsen Antenna	CMC 100MA 2LN 40 OHM SMD	0
	P0354 PulseLarsen Antenna	COMMON MODE CHOKE 1.22A 2LN SMD	0
	PE-0201MCMC350MT PulseLarsen Antenna	CMC 50MA 2LN 35 OHM SMD	0
	P0353 PulseLarsen Antenna	COMMON MODE CHOKE 5.6A 2LN SMD	0
	P0429 PulseLarsen Antenna	COMMON MODE CHOKE 9.7A 2LN SMD	0
	P0473T PulseLarsen Antenna	COMMON MODE CHOKE 1.63A 2LN SMD	0
	PE-1206CCMC161STS PulseLarsen Antenna	CMC 340MA 2LN 160 OHM SMD	0
	T8005NLT PulseLarsen Antenna	COMMON MODE CHOKE 4.7MH 4LN SMD	0
	PE-0201MCMC900ST PulseLarsen Antenna	CMC 50MA 2LN 90 OHM SMD	0
	PE-96161NL PulseLarsen Antenna	COMMON MODE CHOKE 500MA 2LN TH	0

Common Mode Chokes

1. Overview

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.

2. Main Types and Functional Classification

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

3. Structure and Composition

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

4. Key Technical Specifications

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

5. Application Fields

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

6. Leading Manufacturers and Products

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

7. Selection Guidelines

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

8. Industry Development Trends

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.