Ferrite Cores

Part Number	Description / PDF	Quantity
B66453K0000X192 TDK EPCOS	FERRITE CORE I N92	989
B65877A0000R049 TDK EPCOS	FERRITE CORE PQ 3.3UH N49 2PCS	164
B65839A0160J045 TDK EPCOS	FERRITE CORE EP 160NH N45 2PCS	0
B66358G0500X187 TDK EPCOS	FERRITE CORE ETD N87 1PC	120
B66461G0000X197 TDK EPCOS	FERRITE CORE ELP N97 1PC	628
B66367G0000X187 TDK EPCOS	FERRITE CORE ETD N87 1PC	656
B65805P0000R087 TDK EPCOS	FERRITE CORE RM 2.4UH N87 2PCS	805
B65981A0000R095 TDK EPCOS	FERRITE CORE PQ 8.2UH N95 2PCS	12
B65811J0000R041 TDK EPCOS	FERRITE CORE RM 4.1UH N41 2PCS	252
B66319G0000X130 TDK EPCOS	FERRITE CORE E N30 1PC	705
B65843A0160B057 TDK EPCOS	FERRITE CORE EP 160NH T57 2PCS	0
B64290A0658X035 TDK EPCOS	FERRITE CORE TOROID 2.65UH T35	0
B66339G0000X127 TDK EPCOS	FERRITE CORE EC N27 1PC	755
B66287G0000X192 TDK EPCOS	FERRITE CORE ELP N92 1PC	266
B65813P0000R049 TDK EPCOS	FERRITE CORE RM 3.7UH N49 2PCS	148
B66303G0000X187 TDK EPCOS	FERRITE CORE E N87 1PC	26242
B66395G1500X187 TDK EPCOS	FERRITE CORE ETD N87 1PC	0
B64290L0040X037 TDK EPCOS	FERRITE CORE TOROID 7.16UH T37	620
B66293K0000X187 TDK EPCOS	FERRITE CORE I N87 1PC	133
B64290A0618X035 TDK EPCOS	FERRITE CORE TOROID 5.4UH T35	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.