Fixed Inductors

Part Number	Description / PDF	Quantity
0402DC-5N8XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 5.8NH	1433
0402DC-9N1XJRW COILCRAFT	CERAMIC CHIP INDUCTORS, 9.1NH	847
0603DC-R39XGRW COILCRAFT	CERAMIC CHIP INDUCTOR,390NH	4144
0603DC-62NXJRW COILCRAFT	CERAMIC CHIP INDUCTORS 62NH	4480
0603DC-20NXGRW COILCRAFT	CERAMIC CHIP INDUCTORS 20NH	4045
LPS4018-105MRC COILCRAFT	SHIELDED POWER INDUCTORS, 1000UH	1234
0603AF-241XJEW COILCRAFT	WIREWOUND INDUCTOR 240NH@7.9NHMH	4542
0402DC-9N0XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 9.0NH	79
0402DC-N80XKRW COILCRAFT	CERAMIC CHIP INDUCTORS, 0.8NH	0
XPL2010-333MLC COILCRAFT	SHIELDED POWER INDUCTORS, 33UH	11410
0603DC-39NXJRW COILCRAFT	CERAMIC CHIP INDUCTORS 39NH	4112
0402DC-8N7XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 8.7NH	70
0402DC-9N7XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 9.7NH	2035
0402DC-62NXJRW COILCRAFT	CERAMIC CHIP INDUCTORS, 62.0NH	2517
0402DC-N80XJRW COILCRAFT	CERAMIC CHIP INDUCTORS, 0.80NH	85
XPL2010-152MLC COILCRAFT	SHIELDED POWER INDUCTORS, 1.5UH	406
0603DC-R33XGRW COILCRAFT	CERAMIC CHIP INDUCTOR,330NH	4157
LPS3015-224MRC COILCRAFT	SHIELDED POWER INDUCTORS 220H	1116
XPL2010-102MLC COILCRAFT	SHIELDED POWER INDUCTORS, 1.0UH	8158
XGL4020-331MEC COILCRAFT	SHIELDED POWER INDUCTORS, 0.33UH	9225

Fixed Inductors

1. Overview

Fixed inductors are passive electronic components designed to store energy in magnetic fields when electrical current flows through them. Unlike variable inductors, their inductance values remain constant during operation. These components play critical roles in filtering, signal processing, energy storage, and electromagnetic interference (EMI) suppression across modern electronics, including power supplies, communication systems, and automotive electronics.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Wirewound Inductors	High precision, high current handling, low resistance	Power supplies, DC-DC converters
Chip Inductors	Compact SMD package, stable performance at high frequencies	Mobile devices, RF circuits
Ferrite Bead Inductors	Effective high-frequency noise suppression	EMI filtering in digital circuits
Thin-Film Inductors	Ultra-compact, high Q-factor, tight tolerance	5G communication modules, IoT devices

3. Structure and Composition

Typical fixed inductors consist of:

Magnetic Core: Made from ferrite, powdered iron, or composite materials to concentrate magnetic flux
Coil Structure: Copper wire wound around the core (enamelled or silver-plated)
Encapsulation: Molded resin or ceramic coating for mechanical protection and insulation
Terminations: Solder-coated ends for PCB mounting (for SMD types) or leaded connections

4. Key Technical Specifications

Parameter	Description	Importance
Inductance (L)	Measured in henrys (H), determines energy storage capacity	Defines filtering/energy storage performance
Rated Current (I_rated)	Maximum DC current before saturation	Prevents core saturation and failure
DC Resistance (DCR)	Resistance of coil windings	Affects efficiency and thermal performance
Self-Resonant Frequency (SRF)	Frequency where inductor behaves as capacitor	Limits effective operating frequency range
Q Factor	Quality factor indicating efficiency	Higher Q = lower energy losses

5. Application Fields

Consumer Electronics: Smartphones, laptops, LED drivers
Industrial Equipment: Motor drives, power inverters
Automotive Systems: ECU modules, EV battery management
Telecom Infrastructure: Base station filters, optical transceivers

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
Murata	LQH3NPN100M	10 H, 1.2A, 1.8 1.4mm chip inductor
TDK	MLZ2012A100T	100MHz SRF, 1.0 1.25mm for RF circuits
Vishay	IHLP2525CZER1R0M	1 H, 12A, composite construction
Coilcraft	0402DC-103J	10 H, 5% tolerance, ultra-low profile

7. Selection Guidelines

Key considerations during selection:

Calculate required inductance based on switching frequency and ripple current
Verify rated current exceeds maximum operating current by 20-30%
Select SRF higher than circuit operating frequency
Consider package size vs. thermal dissipation requirements
For EMI suppression: Choose ferrite beads with impedance curves matching target frequencies

8. Industry Trends

Current development trends include:

Miniaturization: Sub-0.5mm size inductors for wearable devices
High-Frequency Operation: Components supporting >10GHz 5G applications
Integrated Solutions: Combined inductor-filter modules
Material Innovation: Nanocrystalline cores for higher saturation flux
Automotive Focus: AEC-Q qualified parts for EV/HEV systems