Ferrite Cores

Part Number	Description / PDF	Quantity
35T0501-10H Laird - Performance Materials	FERRITE INDUCTR TOROID .540" OD	13865
35T0375-10H Laird - Performance Materials	FERRITE CORE TOROID	10611
40T0501-10H Laird - Performance Materials	FERRITE CORE TOROID	875
35T1417-00H Laird - Performance Materials	FERRITE CORE TOROID	711
35T0231-00P Laird - Performance Materials	FERRITE CORE TOROID	49614
35T1000-00H Laird - Performance Materials	FERRITE INDUCTR TOROID 1.050" OD	3907
28T0231-00P Laird - Performance Materials	FERRITE CORE TOROID 5.87MM OD	1579
33T0231-10P Laird - Performance Materials	FERRITE CORE TOROID 5.87MM OD	19965
46T0135-10P Laird - Performance Materials	FERRITE CORE TOROID	2721
35T0255-10P Laird - Performance Materials	FERRITE CORE TOROID	9885
35T0119-00P Laird - Performance Materials	FERRITE CORE TOROID 3.07MM OD	1800
28T0122-00P Laird - Performance Materials	FERRITE CORE TOROID 3.07MM OD	8
46T0122-21P Laird - Performance Materials	FERRITE CORE TOROID	50155
36T0153-30P Laird - Performance Materials	FERRITE CORE TOROID 3.96MM OD	1143
46T0119-40P Laird - Performance Materials	FERRITE CORE TOROID 3.07MM OD	0
25T0155-10P Laird - Performance Materials	FERRITE CORE TOROID 3.96MM OD	2102
35T0100-00P Laird - Performance Materials	FERRITE CORE TOROID 2.57MM OD	556
36T0119-40P Laird - Performance Materials	FERRITE CORE TOROID 3.07MM OD	2557
36T0231-00Q Laird - Performance Materials	FERRITE CORE TOROID 5.89MM OD	0
25T0135-60P Laird - Performance Materials	FERRITE CORE TOROID 3.45MM OD	1999

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.