Ferrite Cores

Part Number	Description / PDF	Quantity
B66347G0000X127 TDK EPCOS	FERRITE CORE ER N27 1PC	0
B66457K0000X187 TDK EPCOS	FERRITE CORE I N87	1118
B65935E0000X022 TDK EPCOS	FERRITE CORE	2755
B65931C0000X033 TDK EPCOS	FERRITE CORE P M33 1PC	5472
B65701W0000R087 TDK EPCOS	FERRITE CORE P 6.4UH N87 2PCS	442
B66387Q0250K187 TDK EPCOS	E65/32/27-N87-DG250	38
B64290L0626X830 TDK EPCOS	FERRITE CORE TOROID 3.42UH N30	320
B65807P0000R049 TDK EPCOS	FERRITE CORE RM 2.2UH N49 2PCS	0
B66395G0000X197 TDK EPCOS	FERRITE CORE ETD N97 1PC	0
B66363G0600X127 TDK EPCOS	FERRITE CORE	0
B64290L0638X087 TDK EPCOS	FERRITE CORE TOROID 1.34UH N87	1336
B66894G0000X187 TDK EPCOS	FERRITE CORES	0
B66482K0000X149 TDK EPCOS	FERRITE CORE I N49 1PC	147
B65531W0000Y038 TDK EPCOS	FERRITE CORE P 7UH T38 2PCS	0
B66307G0000X127 TDK EPCOS	FERRITE CORE E N27 1PC	618
B66295G0000X197 TDK EPCOS	FERRITE CORE ELP N97 1PC	93
B66365G1500X187 TDK EPCOS	FERRITE CORE ETD N87 1PC	65
B65805N0025A001 TDK EPCOS	FERRITE CORE RM 25NH K1 2PCS	0
B65531W0000R087 TDK EPCOS	FERRITE CORE P 2UH N87 2PCS	0
B64290P0687X038 TDK EPCOS	FERRITE CORE TOROID 3.9UH T38	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.