Ferrite Cores

Part Number	Description / PDF	Quantity
B66289G0000X149 TDK EPCOS	FERRITE CORE ELP N49 1PC	964
B64290A0632X830 TDK EPCOS	FERRITE CORE TOROID 4.16UH N30	0
B64290P0037X038 TDK EPCOS	FERRITE CORE TOROID 2.53UH T38	25299
B65855B0000R092 TDK EPCOS	FERRITE CORE	0
B64290L0638X038 TDK EPCOS	FERRITE CORE TOROID 6.07UH T38	0
B66387G1000X127 TDK EPCOS	FERRITE CORE E N27 1PC	0
B66307G0100X127 TDK EPCOS	FERRITE CORE E N27 1PC	5850
B65513J0000R087 TDK EPCOS	FERRITE CORE ER 1.5UH N87 2PCS	4649
B65981Q0250K095 TDK EPCOS	PQ50/50-N95-DG250	0
B66501G0000X187 TDK EPCOS	FERRITE CORE ER N87 1PC	4146
B64290L0659X065 TDK EPCOS	FERRITE CORE TOROID 8.2UH T65	105
B66363G2500X187 TDK EPCOS	FERRITE CORE	0
B65803J0000R608 TDK EPCOS	RM4-PC200	978
B66344G2500X127 TDK EPCOS	FERRITE CORE E N27 1PC	0
B62152A0004X001 TDK EPCOS	FERRITE CORE 2 HOLE 190NH K1	2907
B64290P0751X830 TDK EPCOS	FERRITE CORE TOROID 2.4UH N30	0
B65879B0000R087 TDK EPCOS	FERRITE CORE PQ 4.8UH N87 2PCS	128
B64290P0739X065 TDK EPCOS	FERRITE CORE TOROID 2UH T65	0
B64290P0072X065 TDK EPCOS	FERRITE CORE TOROID 600NH T65	0
B65684A0000R087 TDK EPCOS	FERRITE CORE PM 9.2UH N87 2PCS	179

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.