Ferrite Cores

Part Number	Description / PDF	Quantity
PC95PQ32/20Z-12 TDK Corporation	FERRITE CORE PQ 9.12UH 2PC SET	5
PC95ELT15.5X5.8-Z TDK Corporation	FERRITE CORE ELT 3.68UH 1SET	0
HF60T22X10X14 TDK Corporation	TOROIDAL CORE FOR EMI/RFI FILTER	564
PC95PQ20/16Z-12 TDK Corporation	FERRITE CORE PQ 4.48UH 2PC SET	35
PC95PQI20/9Z-12 TDK Corporation	FERRITE CORE PQI 7.07UH 1SET	273
PC95EIR22/5.5/15-Z TDK Corporation	FERRITE CORE EIR 4.15UH 1SET	37
H5C2ER9.5/5-Z TDK Corporation	FERRITE CORE 2PC SET	639
PC95EL25X8.6-Z TDK Corporation	FERRITE CORE EL 7.54UH 2PC SET	95
PC47EPC19-Z TDK Corporation	FERRITE CORE EPC 940NH 2PC SET	554
PC95PQI16/7.8Z-12 TDK Corporation	FERRITE CORE PQI 4.91UH 1SET	497
PC40EER40-Z TDK Corporation	FERRITE CORE 2PC SET	103
PC47EPC27-Z TDK Corporation	FERRITE CORE EPC 1.54UH 2PC SET	27
PC47EPC25-Z TDK Corporation	FERRITE CORE EPC 1.56UH 2PC SET	116
PC95EI18/6/10-Z TDK Corporation	FERRITE CORE EI 4.72UH 1SET	0
PC95PQ60/42-Z TDK Corporation	FERRITE CORE PQ 14.3UH 2PC SET	30
HF60T18X10X10 TDK Corporation	TOROIDAL CORE FOR EMI/RFI FILTER	932
PC95EL20X7.7-Z TDK Corporation	FERRITE CORE EL 5.63UH 2PC SET	0
PC44PQ35/35Z-12 TDK Corporation	FERRITE CORE FOR SW PWR 2PC SET	194
PC95EL18X7.3-Z TDK Corporation	FERRITE CORE EL 4.76UH 2PC SET	34
PC44PQ20/16Z-12-NN TDK Corporation	FERRITE CORE 2PC SET	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.