Ferrite Cores

Part Number	Description / PDF	Quantity
B64290L0022X830 TDK EPCOS	FERRITE CORE TOROID 5UH N30	109
B65807J0000R049 TDK EPCOS	FERRITE CORE RM 1.7UH N49 2PCS	763
B66393G0000X127 TDK EPCOS	FERRITE CORE E N27 1PC	0
B66329G0000X195 TDK EPCOS	FERRITE CORE E N95 1PC	0
B66283G0000X187 TDK EPCOS	FERRITE CORE ELP N87 1PC	4184
B66506G0000X195 TDK EPCOS	FERRITE CORE EQ N95 1PC	0
B65813J0000R097 TDK EPCOS	FERRITE CORE RM 4.2UH N97 2PCS	660
B66311G0170X187 TDK EPCOS	FERRITE CORE E N87 1PC	46
B64290L0048X038 TDK EPCOS	FERRITE CORES	0
B65811J0630J041 TDK EPCOS	FERRITE CORE RM 630NH N41 2PCS	0
B66459G0000X187 TDK EPCOS	FERRITE CORE ELP N87 1PC	763
B66317G0000X197 TDK EPCOS	FERRITE CORE	0
B66335G0000X187 TDK EPCOS	FERRITE CORE E N87 1PC	215
B66219G0000X141 TDK EPCOS	FERRITE CORE	0
B64290L0743X065 TDK EPCOS	FERRITE CORE TOROID 2.8UH T65	0
B65813J0630J041 TDK EPCOS	FERRITE CORE RM 630NH N41 2PCS	58
B66375G0000X187 TDK EPCOS	FERRITE CORE E N87 1PC	1552
B65803P0000R049 TDK EPCOS	FERRITE CORE RM 950NH N49 2PCS	232
B66335G2000X187 TDK EPCOS	FERRITE CORE E N87 1PC	500
B66363G0000X197 TDK EPCOS	FERRITE CORE ETD N97 1PC	233

Ferrite Cores

1. Overview

Ferrite cores are ceramic compounds made from iron oxide and other metal oxides, sintered to form high-permeability magnetic materials. They exhibit low eddy current losses at high frequencies, making them ideal for electromagnetic interference (EMI) suppression, energy storage, and signal transmission in modern electronics. Their unique combination of high resistivity and magnetic properties enables efficient operation in power conversion systems, telecommunications, and automotive electronics.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
EE/EI Cores	High inductance, easy assembly	Switch-mode power supplies (SMPS)
RM Cores	Compact design, low leakage inductance	DC-DC converters
PQ Cores	High power handling, uniform magnetic path	Automotive battery chargers
EP Cores	360 winding space, mechanical stability	LED drivers
Toroidal Cores	Low electromagnetic radiation, high efficiency	RF filters, current sensors

3. Structure and Composition

Typical ferrite cores consist of:

Base material: Mn-Zn or Ni-Zn ferrite compounds
Geometric shapes: E/I, pot, toroid, planar, or custom geometries
Surface treatment: Coatings (epoxy, parylene) or tape wrapping for insulation
Dimensional tolerances: 1% to 3% depending on manufacturing process

4. Key Technical Specifications

Parameter	Description	Importance
Initial Permeability ( i)	Relative magnetic permeability at 10kHz	Determines inductance capability
Saturation Flux Density (Bs)	Maximum magnetic flux before saturation	Limits power handling capacity
Resistivity ( )	Volume resistivity ( cm)	Controls eddy current losses
Curie Temperature (Tc)	Temperature threshold for magnetic loss	Defines operational temperature limits
Dimensional Tolerance	Geometric precision ( 0.05-0.2mm)	Affects winding compatibility

5. Application Fields

Power Electronics: SMPS, inverters, EV chargers
Telecommunications: Broadband transformers, signal isolators
Automotive: On-board chargers, DC-DC converters
Consumer Electronics: LED ballasts, adapter transformers
Industrial: Motor drives, energy storage inductors

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
TDK Corporation	PC40 Material	High Bs (510mT), low core loss
Ferroxcube	3C90 Material	i=2300, Tc=215 C
Magnetics Inc.	R Material	High stability (-20~125 C)
Changzhou Fulltime	EE85/38/20	Planar transformer core

7. Selection Guidelines

Determine operational frequency (Mn-Zn for <5MHz, Ni-Zn for >5MHz)
Calculate required AL value for inductance
Verify Bs against peak current requirements
Select dimensional compatibility with PCB/winding equipment
Assess temperature stability requirements

8. Industry Trends

Key development directions include:

Miniaturization for high-frequency (>1MHz) operation
New materials with permeability >3000 and Bs >550mT
Integrated magnetics combining multiple functions
Environmental compliance (RoHS, halogen-free coatings)
AI-driven core optimization for EV powertrains

Market forecasts predict 6.8% CAGR through 2027, driven by 5G infrastructure and renewable energy systems.