Ferrite Cores

Part Number	Description / PDF	Quantity
B65855A0000R049 TDK EPCOS	FERRITE CORE	0
B66307G0000X187 TDK EPCOS	FERRITE CORE E N87 1PC	4861
B65879Q0150K095 TDK EPCOS	PQ32/30-N95-DG150	0
B65839A0063A087 TDK EPCOS	FERRITE CORE EP 63NH N87 2PCS	0
B64290L0045X035 TDK EPCOS	FERRITE CORE TOROID 3.87UH T35	1840
B65881Q0100K095 TDK EPCOS	PQ35/35-N95-DG100	0
B66285G0000X149 TDK EPCOS	FERRITE CORE ELP N49 1PC	1744
B65661D0000R033 TDK EPCOS	FERRITE CORE	0
B64290L0658X065 TDK EPCOS	FERRITE CORE TOROID 2.3UH T65	0
B66317G1000X127 TDK EPCOS	FERRITE CORE E N27 1PC	365
B65839A0250E038 TDK EPCOS	FERRITE CORE EP 250NH T38 2PCS	0
B65811J0250A087 TDK EPCOS	FERRITE CORE RM 250NH N87 2PCS	2584
B64290L0659X035 TDK EPCOS	FERRITE CORE TOROID 8.2UH T35	235
B66417G0000X197 TDK EPCOS	FERRITE CORE EFD N97 1PC	0
B64290L0652X830 TDK EPCOS	FERRITE CORE TOROID 2.71UH N30	927
B66315G0000X127 TDK EPCOS	FERRITE CORE E N27 1PC	0
B66358G1000X127 TDK EPCOS	FERRITE CORE ETD N27 1PC	0
B64290L0658X087 TDK EPCOS	FERRITE CORE TOROID 970NH N87	1955
B66311G0170X127 TDK EPCOS	FERRITE CORE E N27 1PC	4046
B66367G0000X127 TDK EPCOS	FERRITE CORE ETD N27 1PC	322

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.