Ferrite Cores

Part Number	Description / PDF	Quantity
B64290L0699X087 TDK EPCOS	FERRITE CORE TOROID 5UH N87	317
B65883A0000R097 TDK EPCOS	FERRITE CORE PQ 4.5UH N97 2PCS	135
B64290A0618X830 TDK EPCOS	FERRITE CORE TOROID 4.6UH N30	673
B65517D0040A001 TDK EPCOS	FERRITE CORE P 40NH K1 2PCS	0
B64290L0084X065 TDK EPCOS	FERRITE CORE TOROID 6.5UH T65	0
B64290L0038X065 TDK EPCOS	FERRITE CORE TOROID 1.9UH T65	0
B65811J0000Y038 TDK EPCOS	FERRITE CORE RM 12.5UH T38 2PCS	350
B66455G0000X187 TDK EPCOS	FERRITE CORE ELP N87 1PC	3549
B64290L0045X049 TDK EPCOS	FERRITE CORE	639
B66388B1000T001 TDK EPCOS	CF-E65/32/27-1S	27
B65982Q0100K095 TDK EPCOS	PQ65/60-N95-DG100	14
B64290L0699X830 TDK EPCOS	FERRITE CORE TOROID 10.8UH N30	296
B64290P0692X046 TDK EPCOS	FERRITE CORE TOROID 2.76UH T46	0
B64290L0632X035 TDK EPCOS	FERRITE CORE TOROID 5UH T35	851
B66285K0000X197 TDK EPCOS	FERRITE CORE I N97	569
B64290L0644X087 TDK EPCOS	R13.3/8.3/5 N87 TOROID	0
B64290L0644X035 TDK EPCOS	FERRITE CORE TOROID 2.83UH T35	0
B66335G0500X127 TDK EPCOS	FERRITE CORE E N27 1PC	0
B65671T0100A001 TDK EPCOS	FERRITE CORE P 100NH K1 2PCS	240
B66501G0000X197 TDK EPCOS	FERRITE CORE ER N97 1PC	917

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.