Fixed Inductors

Part Number	Description / PDF	Quantity
LCCI0402J8N2GTAR Elco (AVX)	FIXED IND 8.2NH 500MA 280 MOHM	0
HL021R1BTTR Elco (AVX)	FIXED IND 1.1NH 345MA 99 MOHM	0
L04021R2BHNTR Elco (AVX)	FIXED IND 1.2NH 400MA 200 MOHM	3604
LCCI0201S1N0GTAR Elco (AVX)	FIXED IND 1NH 600MA 140 MOHM SMD	15000
LCCI0402S3N3GTAR Elco (AVX)	FIXED IND 3.3NH 800MA 160 MOHM	10000
L06036R8CGSTR Elco (AVX)	FIXED IND 6.8NH 300MA 300 MOHM	2597
HLC02180HTTR Elco (AVX)	FIXED IND 18NH 210MA 1.5 OHM SMD	0
L06031R5DGWTR Elco (AVX)	FIXED IND 1.5NH 1A 60 MOHM SMD	0
LMLP05D5N4R7CTAS Elco (AVX)	FIXED IND 4.7UH 3.1A 29MOHM SMD	1314
L04024R7BHNTR Elco (AVX)	FIXED IND 4.7NH 250MA 450 MOHM	0
HL021R5BTTR Elco (AVX)	FIXED IND 1.5NH 340MA 128 MOHM	0
LCCI0603S2N7GTAR Elco (AVX)	FIXED IND 2.7NH 1A 130 MOHM SMD	0
LMLP07C7M5R6DTAS Elco (AVX)	FIXED IND 5.6UH 6A 49MOHM SMD	655
LMLP03A2N2R2CTAR Elco (AVX)	FIXED IND 2.2UH 1.2A 80 MOHM SMD	0
L08056R5DEWTR Elco (AVX)	FIXED IND 6.5NH 600 MOHM SMD	0
LMLP06C6M330CTAS Elco (AVX)	FIXED IND 33UH 1.1A 220MOHM SMD	1777
LMLP1313MR68DTAS Elco (AVX)	FIXED IND 680NH 34A 1.7MOHM SMD	500500
LMLP05B5N4R7CTAR Elco (AVX)	FIXED IND 4.7UH 2A 60MOHM SMD	735
L0402R82BHNTR Elco (AVX)	FIXED IND 0.82NH 500MA 60 MOHM	4885
L06033R9CGWTR Elco (AVX)	FIXED IND 3.9NH 500MA 120 MOHM	0

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