Ferrite Cores

Part Number	Description / PDF	Quantity
B65525J0000R092 TDK EPCOS	FERRITE CORE ER 900NH N92 2PCS	0
B64290L0674X065 TDK EPCOS	FERRITE CORE TOROID 6.8UH T65	151
B66363G1000X127 TDK EPCOS	FERRITE CORE ETD N27 1PC	531
B65531D0250A048 TDK EPCOS	FERRITE CORE P 250NH N48 2PCS	694
B66455K0000X187 TDK EPCOS	FERRITE CORE I N87	2900
B66283K0000X192 TDK EPCOS	FERRITE CORE I N92	123
B66335G0000X197 TDK EPCOS	FERRITE CORE E N97 1PC	0
B65815P0000R092 TDK EPCOS	FERRITE CORE RM 4.8UH N92 2PCS	0
B66291G0000X149 TDK EPCOS	FERRITE CORE ELP N49 1PC	939
B64290P0037X065 TDK EPCOS	FERRITE CORE TOROID 1.16UH T65	0
B65541T0315A048 TDK EPCOS	FERRITE CORE P 315NH N48 2PCS	1211
B66375G0000X197 TDK EPCOS	E80/38/20 N97 4700 +30% -20%	0
B66481P0000X192 TDK EPCOS	FERRITE CORE I N92 1PC	313
B65811J0250A048 TDK EPCOS	FERRITE CORE RM 250NH N48 2PCS	786
B66371Q0250K187 TDK EPCOS	E70/33/32-N87-DG250	0
B66417U0400H187 TDK EPCOS	FERRITE CORE	0
B65805C0315A048 TDK EPCOS	FERRITE CORE RM 315NH N48 2PCS	1568
B64290L0048X087 TDK EPCOS	FERRITE CORE TOROID 2.79UH N87	531
B66317G0000X130 TDK EPCOS	FERRITE CORE E N30 1PC	2510
B65883A0000R095 TDK EPCOS	FERRITE CORE PQ 5.5UH N95 2PCS	118

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.