Ferrite Cores

Part Number	Description / PDF	Quantity
4077375211 Fair-Rite Products Corp.	77 SOLID ROD	814
9478102002 Fair-Rite Products Corp.	78 E CORE SET	6589
5943003801 Fair-Rite Products Corp.	43 TOROID	3427
5943018601 Fair-Rite Products Corp.	43 TOROID	0
4052077111 Fair-Rite Products Corp.	52 ROD	57015
7878400421 Fair-Rite Products Corp.	78 PLANAR EI CORE SET	391
9277024002 Fair-Rite Products Corp.	77 U CORE	924
5698362321 Fair-Rite Products Corp.	98 POT CORE SET	110
3061990911 Fair-Rite Products Corp.	61 ROD	545
4077374711 Fair-Rite Products Corp.	77 SOLID ROD	1522
5695302021 Fair-Rite Products Corp.	95 POT CORE SET	157
7895400721 Fair-Rite Products Corp.	95 PLANAR EI CORE SET	36
5678261721 Fair-Rite Products Corp.	78 POT CORE SET	252
5968002701 Fair-Rite Products Corp.	68 TOROID	266
5952020801 Fair-Rite Products Corp.	52 TOROID	1094
5975004901 Fair-Rite Products Corp.	75 TOROID	2482
5980001801 Fair-Rite Products Corp.	80 TOROID	653
3078990881 Fair-Rite Products Corp.	78 ROD	5760
3061990831 Fair-Rite Products Corp.	61 ROD	11246
3061990901 Fair-Rite Products Corp.	61 ROD	1121

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.