Ferrite Cores

Part Number	Description / PDF	Quantity
9478202002 Fair-Rite Products Corp.	78 PLANAR E CORE SET	2174
3078990831 Fair-Rite Products Corp.	78 ROD	23478
6698404121 Fair-Rite Products Corp.	98 PQ CORE SET	105
4061287011 Fair-Rite Products Corp.	61 ROD	2863
5975001401 Fair-Rite Products Corp.	75 TOROID	1007
3078990871 Fair-Rite Products Corp.	78 ROD	9161
4061375411 Fair-Rite Products Corp.	61 ROD	295
5975002701 Fair-Rite Products Corp.	75 TOROID	392
5961002701 Fair-Rite Products Corp.	61 TOROID	13005
4077122011 Fair-Rite Products Corp.	77 ROD	5783
4061378111 Fair-Rite Products Corp.	61 ROD	1500
5961000811 Fair-Rite Products Corp.	61 TOROID PARYLENE COATED	9483
5695181221 Fair-Rite Products Corp.	95 POT CORE SET	1766
4078375111 Fair-Rite Products Corp.	78 ROD	2740
3061990881 Fair-Rite Products Corp.	61 ROD	5261
7895400321 Fair-Rite Products Corp.	95 PLANAR EI CORE SET	670
5977000101 Fair-Rite Products Corp.	77 TOROID	3465
3067990821 Fair-Rite Products Corp.	67 ROD	44199
4061276011 Fair-Rite Products Corp.	61 ROD	992
9277012002 Fair-Rite Products Corp.	77 U CORE	338

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.