Ferrite Cores

Part Number	Description / PDF	Quantity
B65875A0000R097 TDK EPCOS	FERRITE CORE PQ 2.75UH N97 2PCS	314
B65843A0100A087 TDK EPCOS	FERRITE CORE	0
B64290L0742X038 TDK EPCOS	FERRITE CORE TOROID 6.03UH T38	3415
B66322G0000X187 TDK EPCOS	FERRITE CORE E N87 1PC	0
B66361G0000X127 TDK EPCOS	FERRITE CORE ETD N27 1PC	882
B65855B0000Y038 TDK EPCOS	FERRITE CORE EP 1.9UH T38 2PCS	0
B65943A0000X022 TDK EPCOS	FERRITE CORE PS N22	53
B62152A0015X030 TDK EPCOS	FERRITE CORE 2 HOLE 1.6UH N30	0
B66335G2000X127 TDK EPCOS	FERRITE CORE E N27 1PC	0
B65807N0250A048 TDK EPCOS	FERRITE CORE RM 250NH N48 2PCS	0
B65805J0000R045 TDK EPCOS	FERRITE CORE RM 2.6UH N45 2PCS	0
B65982Q0250K095 TDK EPCOS	PQ65/60-N95-DG250	14
B65803J0000R087 TDK EPCOS	FERRITE CORE RM 1.1UH N87 2PCS	1016
B65805C0160A048 TDK EPCOS	FERRITE CORE RM 160NH N48 2PCS	0
B66506P0000X195 TDK EPCOS	FERRITE CORE I N95 1PC	0
B64290L0038X027 TDK EPCOS	FERRITE CORE	2201
B64290L0743X830 TDK EPCOS	FERRITE CORE TOROID 2.32UH N30	0
B65815E0400J041 TDK EPCOS	FERRITE CORE RM 400NH N41 2PCS	339
B66325G0100X127 TDK EPCOS	FERRITE CORE E N27 1PC	0
B64290L0742X037 TDK EPCOS	FERRITE CORE TOROID 3.92UH T37	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.