Ferrite Cores

Part Number	Description / PDF	Quantity
B64290P0036X830 TDK EPCOS	FERRITE CORE TOROID 700NH N30	12777
B64290L0042X065 TDK EPCOS	FERRITE CORE TOROID 7.2UH T65	0
B65855B0000R057 TDK EPCOS	FERRITE CORE EP 900NH T57 2PCS	0
B65803N0016A001 TDK EPCOS	FERRITE CORE RM 16NH K1 2PCS	0
B66317G0160X127 TDK EPCOS	FERRITE CORE E N27 1PC	284
B65517W0000Y038 TDK EPCOS	FERRITE CORE P 5.5UH T38 2PCS	0
B64290L0638X035 TDK EPCOS	FERRITE CORE TOROID 3.2UH T35	891
B65815E0000R030 TDK EPCOS	FERRITE CORE RM 8.7UH N30 2PCS	193
B66229G1000X127 TDK EPCOS	FERRITE CORE E N27 1PC	0
B66281G0000X149 TDK EPCOS	FERRITE CORE ELP N49 1PC	8045
B65811P0000R087 TDK EPCOS	FERRITE CORE RM 4.1UH N87 2PCS	11
B65877B0000R087 TDK EPCOS	FERRITE CORE PQ 5UH N87 2PCS	164
B65843A0200B038 TDK EPCOS	FERRITE CORE EP 200NH T38 2PCS	0
B64290L0657X830 TDK EPCOS	FERRITE CORE TOROID 4.54UH N30	200
B66302G0000X187 TDK EPCOS	FERRITE CORE E N87 1PC	10336
B66413G0000X197 TDK EPCOS	FERRITE CORE EFD N97 1PC	1398
B66483P0000X195 TDK EPCOS	FERRITE CORE I N95 1PC	550
B65671D0000R048 TDK EPCOS	FERRITE CORE P 4.9UH N48 2PCS	292
B64290L0043X830 TDK EPCOS	FERRITE CORE TOROID 9.3UH N30	0
B66482G0000X608 TDK EPCOS	ER23/5/13-PC200	197

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.