Ferrite Cores

Part Number	Description / PDF	Quantity
B65805N0025A001 TDK EPCOS	FERRITE CORE RM 25NH K1 2PCS	0
B65531W0000R087 TDK EPCOS	FERRITE CORE P 2UH N87 2PCS	0
B64290P0687X038 TDK EPCOS	FERRITE CORE TOROID 3.9UH T38	0
B66283G0000X192 TDK EPCOS	FERRITE CORE ELP N92 1PC	2016
B64290L0048X830 TDK EPCOS	FERRITE CORE TOROID 5.46UH N30	1341
B65661W0000R087 TDK EPCOS	FERRITE CORE P 4.4UH N87 2PCS	0
PLT38/25/2.7-3C95 FERROXCUBE	FERRITE CORE	503
E64/10/50-3F4 FERROXCUBE	FERRITE CORE	711
TX80/40/15-3C11 FERROXCUBE	FERRITE CORES ROUND	0
B64290L0618X038 TDK EPCOS	FERRITE CORE TOROID 10.7UH T38	160
B65875B0000R095 TDK EPCOS	FERRITE CORE PQ 3.75UH N95 2PCS	527
B65531D0025A001 TDK EPCOS	FERRITE CORE P 25NH K1 2PCS	0
B65935A0000X033 TDK EPCOS	FERRITE CORE P M33 1PC	2758
4061378111 Fair-Rite Products Corp.	61 ROD	1500
B64290P0739X057 TDK EPCOS	FERRITE CORE TOROID 1.7UH T57	0
B66367G1000X187 TDK EPCOS	FERRITE CORE ETD N87 1PC	74
B65887E0000R049 TDK EPCOS	FERRITE CORE RM 3.9UH N49 2PCS	119
B65875A0000R095 TDK EPCOS	FERRITE CORE PQ 3.3UH N95 2PCS	125
B65661W0000Y038 TDK EPCOS	FERRITE CORE P 16UH T38 2PCS	1195
B65807J0160A048 TDK EPCOS	FERRITE CORE RM 160NH N48 2PCS	358

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.