Ferrite Cores

Part Number	Description / PDF	Quantity
B66413U0100K187 TDK EPCOS	FERRITE CORE EFD N87 1PC	1871
B64290L0038X038 TDK EPCOS	FERRITE CORE TOROID 4.09UH T38	38935
B64290P0037X001 TDK EPCOS	FERRITE CORE TOROID 20NH K1	11444
B65811D0000R048 TDK EPCOS	FERRITE CORE RM 2.9UH N48 2PCS	23
B64290L0615X087 TDK EPCOS	FERRITE CORES	893
B65887E0160A087 TDK EPCOS	FERRITE CORE	71
B66283G0000X149 TDK EPCOS	FERRITE CORE ELP N49 1PC	3967
B65811D0250A048 TDK EPCOS	FERRITE CORE RM 250NH N48 2PCS	0
B64290L0696X065 TDK EPCOS	FERRITE CORE TOROID 4.5UH T65	0
B64290L0696X830 TDK EPCOS	FERRITE CORES	0
B66361G0000X195 TDK EPCOS	FERRITE CORES	0
B66387G0500X187 TDK EPCOS	FERRITE CORE E N87 1PC	0
B64290L0719X035 TDK EPCOS	FERRITE CORE TOROID 4UH T35	0
B65981B0000R087 TDK EPCOS	PQ50/40 N87 UNGAPPED	0
B65525J0000R001 TDK EPCOS	FERRITE CORE	0
B66421U0315K187 TDK EPCOS	FERRITE CORE EFD N87 1PC	881
B65701W0000R030 TDK EPCOS	FERRITE CORE P 11.5UH N30 2PCS	0
B65811J0000R608 TDK EPCOS	RM8-PC200	19
B66367G1000X127 TDK EPCOS	FERRITE CORE ETD N27 1PC	0
B66483P0000X197 TDK EPCOS	FERRITE CORE I N97 1PC	1172

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.