Ferrite Cores

Part Number	Description / PDF	Quantity
B66389G0000X127 TDK EPCOS	FERRITE CORE E N27 1PC	187
B65885A0000R095 TDK EPCOS	FERRITE CORE PQ 2.75UH N95 2PCS	1145
B65517D0000R048 TDK EPCOS	FERRITE CORE P 1.3UH N48 2PCS	1491
B65843A0000Y038 TDK EPCOS	FERRITE CORE EP 7UH T38 2PCS	1391
B65841A0100A087 TDK EPCOS	FERRITE CORE EP 100NH N87 2PCS	0
B66479P0000X192 TDK EPCOS	FERRITE CORE I N92 1PC	0
B66453K0000X149 TDK EPCOS	FERRITE CORE I N49	8801
B66358G0200X127 TDK EPCOS	FERRITE CORE ETD N27 1PC	0
B66411G0000X197 TDK EPCOS	FERRITE CORES	0
B64290L0659X830 TDK EPCOS	FERRITE CORE TOROID 7UH N30	94
B66307G0500X127 TDK EPCOS	FERRITE CORE E N27 1PC	2825
B66365G0500X127 TDK EPCOS	FERRITE CORE ETD N27 1PC	0
B66395G0000X187 TDK EPCOS	FERRITE CORE ETD N87 1PC	270
B64290A0618X033 TDK EPCOS	FERRITE CORE	1272
B64290L0742X065 TDK EPCOS	FERRITE CORE TOROID 2.85UH T65	4921
B64290L0699X065 TDK EPCOS	FERRITE CORE TOROID 12.6UH T65	213
B65525J0000R608 TDK EPCOS	ER11/5-PC200	529
B65541D0000R033 TDK EPCOS	FERRITE CORE P 970NH M33 2PCS	1470
B65671T0100A033 TDK EPCOS	FERRITE CORE P 100NH M33 2PCS	0
B66293G0000X187 TDK EPCOS	FERRITE CORE ELP N87 1PC	98

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.