Fixed Inductors

Part Number	Description / PDF	Quantity
0402DC-23NXGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 23.0NH	471
0402DC-30NXJRW COILCRAFT	CERAMIC CHIP INDUCTORS, 30.0NH	11956
0402DC-9N5XJRW COILCRAFT	CERAMIC CHIP INDUCTORS, 9.5NH	4646
0603AF-103XJEW COILCRAFT	WIREWOUND INDUCTOR 10000NH@2.5MH	5396
XPL2010-822MLC COILCRAFT	SHIELDED POWER INDUCTORS, 8.2UH	1201
0603DC-R30XGRW COILCRAFT	CERAMIC CHIP INDUCTOR,300NH	4126
0603AF-50NXJEW COILCRAFT	WIREWOUND INDUCTOR 50NH@7.9MHZ	3682
0603DC-R33XJRW COILCRAFT	CERAMIC CHIP INDUCTOR,330NH	4458
XGL4030-271MEC COILCRAFT	SHIELDED POWER INDUCTORS, 0.27UH	1331
0603DC-R27XJRW COILCRAFT	CERAMIC CHIP INDUCTOR,270NH	4422
0402DC-6N6XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 6.6NH	882
0402DC-72NXGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 72.0NH	5910
0603DC-R39XJRW COILCRAFT	CERAMIC CHIP INDUCTOR,390NH	4454
0402DC-18NXJRW COILCRAFT	CERAMIC CHIP INDUCTORS, 18.0NH	12855
0402DC-R12XJRW COILCRAFT	CERAMIC CHIP INDUCTORS, R12NH	960
LPS4018-561MRC COILCRAFT	SHIELDED POWER INDUCTORS, 0.56UH	624
0603AF-601XJEW COILCRAFT	WIREWOUND INDUCTOR 601NH@7.9MHZ	3995
0402DC-82NXJRW COILCRAFT	CERAMIC CHIP INDUCTORS, 82.0NH	10790
XPL2010-501MLC COILCRAFT	SHIELDED POWER INDUCTORS, 0.50UH	22922
XGL4030-761MEC COILCRAFT	SHIELDED POWER INDUCTORS, 0.76UH	1385

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