Ferrite Cores

Part Number	Description / PDF	Quantity
B65651W0000R030 TDK EPCOS	FERRITE CORE P 5.9UH N30 2PCS	699
B65859A0000Y038 TDK EPCOS	FERRITE CORE EPX 6.1UH T38 2PCS	0
B65531D0000R033 TDK EPCOS	FERRITE CORE P 780NH M33 2PCS	508
B66363G1000X187 TDK EPCOS	FERRITE CORE ETD N87 1PC	446
B65803A0160A048 TDK EPCOS	FERRITE CORE RM 160NH N48 2PCS	1500
B66229G0000X130 TDK EPCOS	FERRITE CORE E N30 1PC	0
B65933A0000X022 TDK EPCOS	FERRITE CORE PS N22 1PC	5722
B65803J0000Y035 TDK EPCOS	FERRITE CORE RM 2.8UH T35 2PCS	0
B64290P0035X830 TDK EPCOS	FERRITE CORE TOROID 440NH N30	0
B65875A0000R087 TDK EPCOS	FERRITE CORE PQ 2.65UH N87 2PCS	147
B66229G0500X187 TDK EPCOS	FERRITE CORE E N87 1PC	380
B65531D0160A048 TDK EPCOS	FERRITE CORE P 160NH N48 2PCS	303
B65813P0000R087 TDK EPCOS	FERRITE CORE RM 5.2UH N87 2PCS	423
B66253B1000T001 TDK EPCOS	CF-E55/28/25-1S	46
B65839A0200C057 TDK EPCOS	FERRITE CORE EP 200NH T57 2PCS	0
B66233G0000X197 TDK EPCOS	FERRITE CORE	0
B66358G0000X127 TDK EPCOS	FERRITE CORE ETD N27 1PC	421
B65882B0012T001 TDK EPCOS	CF-PQ35/35-V-1S-12P	37
B65811J0630J048 TDK EPCOS	FERRITE CORE RM 630NH N48 2PCS	0
B64290L0044X035 TDK EPCOS	FERRITE CORE TOROID 3.06UH T35	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.