Fixed Inductors

Part Number	Description / PDF	Quantity
0603DC-56NXJRW COILCRAFT	CERAMIC CHIP INDUCTORS 56NH	4458
0402DC-11NXJRW COILCRAFT	CERAMIC CHIP INDUCTORS, 11.0NH	770
0402DC-8N5XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 8.5NH	1803
0402DC-56NXGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 56.0NH	211
LPS4018-472MRC COILCRAFT	SHIELDED POWER INDUCTORS, 4.7UH	0
0402DC-3N0XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 3.0NH	4984
XGL4030-822MEC COILCRAFT	SHIELDED POWER INDUCTORS, 8.2UH	1370
0603DC-R15XJRW COILCRAFT	CERAMIC CHIP INDUCTOR,150NH	4079
0402DC-11NXGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 11.0NH	1003
0603AF-121XJEW COILCRAFT	WIREWOUND INDUCTOR 120NH@7.9MHZ	4125
0603AF-391XJEW COILCRAFT	WIREWOUND INDUCTOR 391NH@7.9MHZ	6276
0603DC-18NXJRW COILCRAFT	CERAMIC CHIP INDUCTOR,18NH	5648
0402DC-3N0XJRW COILCRAFT	CERAMIC CHIP INDUCTOR, 3.0NH	10942
LPS4018-334MRC COILCRAFT	SHIELDED POWER INDUCTORS, 330UH	5328
0402DC-8N2XJRW COILCRAFT	CERAMIC CHIP INDUCTORS, 8.2NH	5160
0402DC-9N4XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 9.4NH	1572
0402DC-1N0XJRW COILCRAFT	CERAMIC CHIP INDUCTORS, 1.0NH	223
XGL4030-123MEC COILCRAFT	SHIELDED POWER INDUCTORS, 12UH	871
LPS3015-332MRC COILCRAFT	SHIELDED POWER INDUCTORS 3.3H	15782
0603AF-47NXJEW COILCRAFT	WIREWOUND INDUCTOR 47NH@7.9MHZ	1624

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