Ferrite Cores

Part Number	Description / PDF	Quantity
B66344G0000X187 TDK EPCOS	FERRITE CORE E N87 1PC	333
B65807J0000R045 TDK EPCOS	FERRITE CORE RM 3.5UH N45 2PCS	0
B66367G0200X187 TDK EPCOS	FERRITE CORE ETD N87 1PC	137
B64290P0751X065 TDK EPCOS	FERRITE CORE TOROID 4.6UH T65	0
B65819P0000R092 TDK EPCOS	FERRITE CORE RM 2.6UH N92 2PCS	0
B64290L0615X038 TDK EPCOS	FERRITE CORE TOROID 16.1UH T38	211
B66361G0000X187 TDK EPCOS	FERRITE CORE ETD N87 1PC	1984
B66358G0500X127 TDK EPCOS	FERRITE CORE ETD N27 1PC	784
B64290A0044X035 TDK EPCOS	FERRITE CORE TOROID 3.06UH T35	0
B64290A0618X087 TDK EPCOS	FERRITE CORE TOROID 2.36UH N87	0
B67345B0003X027 TDK EPCOS	FERRITE CORE U N27 1PC	0
B65859A0000R057 TDK EPCOS	FERRITE CORE EPX 2UH T57 2PCS	0
B66361G1000X127 TDK EPCOS	FERRITE CORE ETD N27 1PC	581
B65684A0315A027 TDK EPCOS	FERRITE CORE PM 315NH N27 2PCS	40
B62152A0007X030 TDK EPCOS	FERRITE CORE 2 HOLE 7.3UH N30	7415
B66281G0000X192 TDK EPCOS	FERRITE CORE ELP N92 1PC	0
B66325G0000X197 TDK EPCOS	FERRITE CORE E N97 1PC	0
B66395G0500X187 TDK EPCOS	FERRITE CORE	236
B66483P0000X149 TDK EPCOS	FERRITE CORE I N49 1PC	273
B66455G0000X192 TDK EPCOS	FERRITE CORE ELP N92 1PC	3598

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.