Ferrite Cores

Part Number	Description / PDF	Quantity
B64290L0022X037 TDK EPCOS	FERRITE CORE TOROID 7UH T37	0
B66305G0000X165 TDK EPCOS	FERRITE CORE	0
B65841A0250E038 TDK EPCOS	FERRITE CORE EP 250NH T38 2PCS	0
B66417G0000X608 TDK EPCOS	EFD20/10/7-PC200	34
B66417G0000X187 TDK EPCOS	FERRITE CORE EFD N87 1PC	8597
B65877B0000R097 TDK EPCOS	FERRITE CORE PQ 5.15UH N97 2PCS	390
B65928A0000X022 TDK EPCOS	FERRITE CORE	0
B66421G0000X197 TDK EPCOS	FERRITE CORE EFD N97 1PC	1460
B66325G0000X130 TDK EPCOS	FERRITE CORE E N30 1PC	199
B65931C0000X022 TDK EPCOS	FERRITE CORES	4000
B64290L0730X830 TDK EPCOS	FERRITE CORE TOROID 5.4UH N30	8
B66381G0000X172 TDK EPCOS	FERRITE CORE E N72 1PC	620
B65651D0000R030 TDK EPCOS	FERRITE CORE P N30 2PCS	340
B64290A0040X830 TDK EPCOS	FERRITE CORE TOROID 5.4UH N30	266
B64290P0683X065 TDK EPCOS	FERRITE CORE TOROID 1UH T65	0
B65887E0000R087 TDK EPCOS	FERRITE CORE RM 6UH N87 2PCS	1483
B66363G0200X187 TDK EPCOS	FERRITE CORE ETD N87 1PC	341
B64290L0651X065 TDK EPCOS	FERRITE CORE TOROID 6.2UH T65	229
B64290L0699X037 TDK EPCOS	FERRITE CORE TOROID 13.9UH T37	62
B66457K0000X197 TDK EPCOS	FERRITE CORE I N97	693

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.