Ferrite Cores

Part Number	Description / PDF	Quantity
B67345B0004X027 TDK EPCOS	FERRITE CORE I N27 1PC	0
B65511A0025A001 TDK EPCOS	FERRITE CORE P 25NH K1 2PCS	0
B65523J0000R097 TDK EPCOS	FERRITE CORE ER 840NH N97 2PCS	4483
B66305G0000X187 TDK EPCOS	FERRITE CORE E N87 1PC	6137
B64290L0038X035 TDK EPCOS	FERRITE CORE TOROID 2.46UH T35	4952
B64290L0062X038 TDK EPCOS	FERRITE CORE TOROID 4.41UH T38	0
B66317G1000X187 TDK EPCOS	FERRITE CORE E N87 1PC	2336
B66305G0000X127 TDK EPCOS	FERRITE CORE E N27 1PC	4140
B66229G0500X127 TDK EPCOS	FERRITE CORE E N27 1PC	0
B66434G0000X197 TDK EPCOS	FERRITE CORE EV N97 1PC	0
B66283K0000X187 TDK EPCOS	FERRITE CORE I N87	3953
B65807J0000R608 TDK EPCOS	RM6-PC200	796
B66395G2000X187 TDK EPCOS	FERRITE CORE ETD N87 1PC	175
B66387G1500X127 TDK EPCOS	FERRITE CORE E N27 1PC	47
B66291G0000X187 TDK EPCOS	FERRITE CORE ELP N87 1PC	1106
B64290L0730X037 TDK EPCOS	FERRITE CORE TOROID 7UH T37	23
B65805J0250A048 TDK EPCOS	FERRITE CORE RM 250NH N48 2PCS	0
B64290L0062X046 TDK EPCOS	FERRITE CORE TOROID 6.4UH T46	5929
B65811J0250J041 TDK EPCOS	FERRITE CORE RM 250NH N41 2PCS	166
B65807J0000R030 TDK EPCOS	FERRITE CORE RM 4.3UH N30 2PCS	1255

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.