Ferrite Disks and Plates

Part Number	Description / PDF	Quantity
7427414 Würth Elektronik Midcom	WE-CPU EMI SUPPRESSION CPU FERRI	0
7427415 Würth Elektronik Midcom	WE-CPU EMI SUPPRESSION CPU FERRI	0
7427417 Würth Elektronik Midcom	WE-CPU EMI SUPPRESSION CPU FERRI	103
7427419 Würth Elektronik Midcom	WE-CPU EMI SUPPRESSION CPU FERRI	0

Ferrite Disks and Plates

1. Overview

Ferrite disks and plates are passive electronic components made from sintered iron oxide composites with nickel, zinc, or manganese additives. They exhibit high magnetic permeability and electrical resistivity, making them ideal for suppressing electromagnetic interference (EMI) in electronic circuits. These components play a critical role in modern electronics by mitigating high-frequency noise in power lines, signal cables, and RF systems.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Manganese-Zinc (MnZn) Ferrite	High permeability ( i: 2000-15,000), low-frequency operation (10kHz-5MHz)	Power supply filters, transformer cores
Nickel-Zinc (NiZn) Ferrite	Moderate permeability ( i: 100-2000), high-frequency stability (1MHz-3GHz)	RFID antennas, wireless charging systems
Flexible Ferrite Sheets	Low-profile, adhesive-backed construction	Portable electronics, cable management

3. Structure and Composition

Typical construction features:

Disk/plate geometry with diameters ranging from 5mm to 50mm
Material composition: Fe O (60-70%) + Mn-Zn/Ni-Zn additives
Surface treatment: Epoxy coating (standard) or PTFE for high-temperature environments
Porosity control: 10-15% to optimize magnetic hysteresis

4. Key Technical Parameters

Parameter	Description	Importance
Initial Permeability ( i)	Measures magnetic responsiveness	Determines noise suppression efficiency
Cutoff Frequency (MHz)	Effective operating frequency range	Matches component to target EMI spectrum
Impedance (Z) @ 100MHz	Complex resistance value ( )	Quantifies noise attenuation capability
Curie Temperature ( C)	Thermal threshold for magnetic properties	Defines operational temperature limits
Dimensional Tolerance	Manufacturing precision ( 0.05mm)	Ensures mechanical compatibility

5. Application Areas

Key industries include:

Consumer Electronics: Mobile phone chargers, HDMI cables
Telecommunications: 5G base stations, fiber optic transceivers
Automotive: EV battery management systems, ADAS sensors
Industrial: CNC machine controllers, power inverters

6. Leading Manufacturers

Manufacturer	Key Products	Specialization
TDK Corporation	PC400 series MnZn cores	High-power applications
MAGNETICS by Arnold	0K41 material NiZn disks	Aerospace-grade components
Ferrite International	FlexFerrite adhesive sheets	Custom-shaped solutions

7. Selection Guidelines

Key considerations:

Frequency matching: Select cutoff frequency >1.5 target noise frequency
Thermal management: Choose Curie temperature >1.2 expected operating temperature
Mechanical constraints: Account for 3D mounting space and weight limits
Cost optimization: Balance permeability requirements with material costs

Case study: Electric vehicle charging stations typically use MnZn disks with i=5000 to suppress 150kHz switching noise.

8. Industry Trends

Emerging developments:

Nanostructured ferrites for THz-range operation
Embedded ferrite plates in PCB substrates
Lead-free formulations complying with RoHS 3.0
AI-driven permeability optimization algorithms