Ferrite Cores

Part Number	Description / PDF	Quantity
B66387G2500X187 TDK EPCOS	FERRITE CORE	0
B65803J0000R048 TDK EPCOS	FERRITE CORE	0
B65517T0025A001 TDK EPCOS	FERRITE CORE P 25NH K1 2PCS	0
B66343G0000X127 TDK EPCOS	FERRITE CORE EC N27 1PC	424
B65877A0000R097 TDK EPCOS	FERRITE CORE PQ 4.65UH N97 2PCS	287
B65879B0000R049 TDK EPCOS	FERRITE CORE PQ 3.45UH N49 2PCS	215
B65811J0000R030 TDK EPCOS	FERRITE CORE RM 5.7UH N30 2PCS	0
B65803P0000R087 TDK EPCOS	FERRITE CORE RM 1.3UH N87 2PCS	4795
B65807P0000R092 TDK EPCOS	FERRITE CORE RM 2.3UH N92 2PCS	0
B65815E0000R049 TDK EPCOS	FERRITE CORE RM 3.7UH N49 2PCS	135
B64290L0647X038 TDK EPCOS	FERRITE CORE TOROID 13.1UH T38	560
B65879B0000R095 TDK EPCOS	FERRITE CORE PQ 6.1UH N95 2PCS	238
B65939A0000X022 TDK EPCOS	FERRITE CORE PS N22	139
B67374G0000X187 TDK EPCOS	FERRITE CORE U N87 1PC	28
B65807J0315A048 TDK EPCOS	FERRITE CORE RM 315NH N48 2PCS	0
B64290L0652X037 TDK EPCOS	FERRITE CORE TOROID 4.08UH T37	0
B65813N0400A048 TDK EPCOS	FERRITE CORE RM 400NH N48 2PCS	1330
B64290L0058X830 TDK EPCOS	FERRITE CORE TOROID 4.36UH N30	1236
B65517D0063A033 TDK EPCOS	FERRITE CORE P 63NH M33 2PCS	2168
B66371G0000X127 TDK EPCOS	FERRITE CORE E 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.