Ferrite Cores

Part Number	Description / PDF	Quantity
B65523J0000R087 TDK EPCOS	FERRITE CORE ER 800NH N87 2PCS	5472
B64290P0037X046 TDK EPCOS	FERRITE CORE TOROID 3.6UH T46	0
B66335G1500X127 TDK EPCOS	FERRITE CORE E N27 1PC	107
B67345B0004X087 TDK EPCOS	FERRITE CORE I N87 1PC	380
B66389G1000X127 TDK EPCOS	FERRITE CORE E N27 1PC	0
B66453K0000X608 TDK EPCOS	I18/2/10-PC200	1735
B65819J0250J041 TDK EPCOS	FERRITE CORE RM 250NH N41 2PCS	0
B66397G1000X187 TDK EPCOS	FERRITE CORE ETD N87 1PC	113
B66325G1500X187 TDK EPCOS	FERRITE CORE	0
B67345B0002X027 TDK EPCOS	FERRITE CORE I N27 1PC	18
B65841A0000R065 TDK EPCOS	FERRITE CORE EP 2.9UH T65 2PCS	0
B66480G0000X149 TDK EPCOS	FERRITE CORE ER N49 1PC	4382
B66506K0000X197 TDK EPCOS	I30/2.7/20 N97 UNGAPPED	0
B65807J0000R035 TDK EPCOS	FERRITE CORE RM 6.2UH T35 2PCS	418
B65517D0160A048 TDK EPCOS	FERRITE CORE P 160NH N48 2PCS	970
B66302G0000X138 TDK EPCOS	FERRITE CORE E T38 1PC	6910
B65525J0160A087 TDK EPCOS	FERRITE CORE ER 160NH N87 2PCS	4374
B64290L0616X035 TDK EPCOS	FERRITE CORE TOROID 10.7UH T35	24
B65611D0000R048 TDK EPCOS	FERRITE CORE P 7.6UH N48 2PCS	67
B66365G0200X127 TDK EPCOS	FERRITE CORE ETD N27 1PC	0

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.