Ferrite Cores

Part Number	Description / PDF	Quantity
8995101021 Fair-Rite Products Corp.	98 EFD CORE SET	7123
5980001001 Fair-Rite Products Corp.	80 TOROID	395
5695140921 Fair-Rite Products Corp.	95 POT CORE SET	2092
5943002721 Fair-Rite Products Corp.	43 TOROID PLASTIC COATED	1908
7895400421 Fair-Rite Products Corp.	95 PLANAR EI CORE SET	528
5977004901 Fair-Rite Products Corp.	77 TOROID	0
9498202002 Fair-Rite Products Corp.	98 PLANAR E CORE SET	0
5975000501 Fair-Rite Products Corp.	75 TOROID	0
9598354202 Fair-Rite Products Corp.	98 EER CORE SET	0
5978015901 Fair-Rite Products Corp.	78 TOROID	0
5977001201 Fair-Rite Products Corp.	77 TOROID	211
8998303021 Fair-Rite Products Corp.	98 EFD CORE SET	0
9495207002 Fair-Rite Products Corp.	95 PLANAR E CORE SET	0
6678212021 Fair-Rite Products Corp.	78 PQ CORE SET	0
8978121221 Fair-Rite Products Corp.	78 EFD CORE SET	0
3061990891 Fair-Rite Products Corp.	61 ROD	0
9598495402 Fair-Rite Products Corp.	98 EER CORE SET	0
5978011101 Fair-Rite Products Corp.	78 TOROID	0
6278280121 Fair-Rite Products Corp.	78 RM CORE SET	0
5978008001 Fair-Rite Products Corp.	78 TOROID	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.