Ferrite Cores

Part Number	Description / PDF	Quantity
B66367G0000X197 TDK EPCOS	FERRITE CORE ETD N97 1PC	159
B65807P0000Y038 TDK EPCOS	FERRITE CORE RM 10.5UH T38 2PCS	0
B65805N0040A001 TDK EPCOS	FERRITE CORE RM 40NH K1 2PCS	1159
B66358G0000X187 TDK EPCOS	FERRITE CORE ETD N87 1PC	1251
B66311G0090X187 TDK EPCOS	FERRITE CORE E N87 1PC	3167
B65843P0000R045 TDK EPCOS	FERRITE CORE	0
B67370A0002X187 TDK EPCOS	FERRITE CORE U N87 1PC	7
B64290L0062X035 TDK EPCOS	FERRITE CORE TOROID 2.65UH T35	0
B65879Q0100K095 TDK EPCOS	PQ32/30-N95-DG100	0
B65855A0000R092 TDK EPCOS	FERRITE CORE	0
B64290A0044X087 TDK EPCOS	FERRITE CORE TOROID 11.2UH N87	0
B65811J0160A087 TDK EPCOS	FERRITE CORE RM N87 2PCS	860
B65819J0000R049 TDK EPCOS	FERRITE CORE RM 1.9UH N49 2PCS	0
B65819P0000R049 TDK EPCOS	FERRITE CORE RM 2.4UH N49 2PCS	0
B65805J0000Y038 TDK EPCOS	FERRITE CORE RM 6.7UH T38 2PCS	3180
B65807N0100A033 TDK EPCOS	FERRITE CORE RM 100NH M33 2PCS	985
B64290L0719X065 TDK EPCOS	FERRITE CORE TOROID 3.93UH T65	0
B66506P0000X188 TDK EPCOS	FERRITE CORE I30/2.7/20 N88 UNGA	0
B65811J0000R097 TDK EPCOS	FERRITE CORE RM 3.3UH N97 2PCS	911
B66365G1000X127 TDK EPCOS	FERRITE CORE ETD N27 1PC	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.