Ferrite Cores

Part Number	Description / PDF	Quantity
B66289K0000X187 TDK EPCOS	FERRITE CORE I N87	313
B65523J0000R608 TDK EPCOS	FERRITE CORE ER PC200	4564
B65805J0000R030 TDK EPCOS	FERRITE CORE RM 3.5UH N30 2PCS	2436
B64290L0022X087 TDK EPCOS	FERRITE CORE TOROID 2.56UH N87	7
B65511A0160C048 TDK EPCOS	FERRITE CORE P N48 2PCS	0
B65807C0160A048 TDK EPCOS	FERRITE CORE RM 160NH N48 2PCS	0
B66287G0000X187 TDK EPCOS	FERRITE CORE ELP N87 1PC	7496
B65981A0000R092 TDK EPCOS	FERRITE CORE PQ 4.7UH N92 2PCS	3
B64290L0632X027 TDK EPCOS	FERRITE CORE TOROID 1.94UH N27	1503
B64290P0683X038 TDK EPCOS	FERRITE CORE TOROID 2.2UH T38	0
B65839A0000R057 TDK EPCOS	FERRITE CORE EP 1.5UH T57 2PCS	0
B66483P0000X187 TDK EPCOS	FERRITE CORE I N87 1PC	1070
B66894G0000X197 TDK EPCOS	FERRITE CORES	0
B65875B0000R092 TDK EPCOS	FERRITE CORE PQ 2.4UH N92 2PCS	480
B66325G1500X127 TDK EPCOS	FERRITE CORE E N27 1PC	0
B66311G0250X187 TDK EPCOS	FERRITE CORE E N87 1PC	1954
B66417U0250K187 TDK EPCOS	FERRITE CORE	329
B66484K0000X149 TDK EPCOS	FERRITE CORE I N49 1PC	800
B66417U0160K187 TDK EPCOS	FERRITE CORE EFD N87 1PC	6116
B66319G0180X187 TDK EPCOS	FERRITE CORE E N87 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.