Ferrite Cores

Part Number	Description / PDF	Quantity
B66411G0000X187 TDK EPCOS	FERRITE CORE EFD N87 1PC	1406
B64290L0743X038 TDK EPCOS	FERRITE CORE TOROID 5.4UH T38	0
B64290A0045X035 TDK EPCOS	FERRITE CORE TOROID 3.87UH T35	2784
B66408G0000X127 TDK EPCOS	FERRITE CORE EV N27 1PC	0
B65803A0016A001 TDK EPCOS	FERRITE CORE RM 16NH K1 2PCS	0
B66230B1114T001 TDK EPCOS	CF-E32/16/11-H-1S-14P	0
B65713A0000R087 TDK EPCOS	FERRITE CORE PM 12UH N87 2PCS	0
B66363G0200X127 TDK EPCOS	FERRITE CORE ETD N27 1PC	0
B66283K0000X197 TDK EPCOS	FERRITE CORE I N97	509
B65701D0000R048 TDK EPCOS	FERRITE CORE P 6.2UH N48 2PCS	277
B65541T0160G048 TDK EPCOS	FERRITE CORE P 160NH N48 2PCS	1265
B65841A0250E087 TDK EPCOS	FERRITE CORE EP 250NH N87 2PCS	0
B65887E1000J041 TDK EPCOS	FERRITE CORE RM 1UH N41 2PCS	407
B66303G0000X138 TDK EPCOS	FERRITE CORE E T38 1PC	0
B65805C0063A033 TDK EPCOS	FERRITE CORE RM 63NH M33 2PCS	0
B67385P0000X187 TDK EPCOS	FERRITE CORE I N87 1PC	82
B66347G0000X187 TDK EPCOS	FERRITE CORE ER N87 1PC	69
B65541W0000Y038 TDK EPCOS	FERRITE CORE P 9.8UH T38 2PCS	0
B64290L0647X037 TDK EPCOS	FERRITE CORE TOROID 8.5UH T37	701
B66315G0000X130 TDK EPCOS	FERRITE CORE E N30 1PC	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.