Ferrite Cores

Part Number	Description / PDF	Quantity
PC95EI22/8/16-Z TDK Corporation	FERRITE CORE EI 8.01UH 1SET	183
HF90T28X13X16 TDK Corporation	TOROIDAL CORE FOR COMMON MODE CH	161
HF60T62X13X39 TDK Corporation	TOROIDAL CORE FOR EMI/RFI FILTER	0
H5AP22/13Z-52H TDK Corporation	2PCS POT CORE FOR SIGNAL TRANSFO	196
HF90T38X14X22 TDK Corporation	TOROIDAL CORE FOR COMMON MODE CH	277
HF90T25X13X15 TDK Corporation	TOROIDAL CORE FOR COMMON MODE CH	891
H5AP14/8Z-52B TDK Corporation	2PCS POT CORE FOR SIGNAL TRANSFO	463
H5AP18/11Z-52B TDK Corporation	2PCS POT CORE FOR SIGNAL TRANSFO	254
HF60T44.5X13X30 TDK Corporation	TOROIDAL CORE FOR EMI/RFI FILTER	0
HF90T22X10X14 TDK Corporation	TOROIDAL CORE FOR COMMON MODE CH	321
HF90T14X7X8 TDK Corporation	TOROIDAL CORE FOR COMMON MODE CH	1781
H5AP11/7Z-52H TDK Corporation	2PCS POT CORE FOR SIGNAL TRANSFO	0
HF90T62X13X39 TDK Corporation	TOROIDAL CORE FOR COMMON MODE CH	0
PC47EI30-Z TDK Corporation	EI CORE SMPS TRANSFORMER 1 SET	71
HF90T31X13X19 TDK Corporation	TOROIDAL CORE FOR COMMON MODE CH	390
PC47EI50-Z TDK Corporation	EI CORE SMPS TRANSFORMER 1 SET	46
HF60T80X20X50 TDK Corporation	TOROIDAL CORE FOR EMI/RFI FILTER	38
HF90T18X10X10 TDK Corporation	TOROIDAL CORE FOR COMMON MODE CH	373
HF60T38X14X22 TDK Corporation	TOROIDAL CORE FOR EMI/RFI FILTER	0
HF60T28X13X16 TDK Corporation	TOROIDAL CORE FOR EMI/RFI FILTER	373

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.