Fixed Inductors

Part Number	Description / PDF	Quantity
LMLP0506M6R8DTAS Elco (AVX)	FIXED IND 6.8UH 3A 90MOHM SMD	1855
HLC021R2BTTR Elco (AVX)	FIXED IND 1.2NH 751MA 110 MOHM	0
LMLP1011M330DTAS Elco (AVX)	FIXED IND 33UH 4.4A 92MOHM SMD	0
LMLP1313M6R8DTAS Elco (AVX)	FIXED IND 6.8UH 11A 18.5MOHM SMD	500
LMLP0404N6R8CTAS Elco (AVX)	FIXED IND 6.8UH 620MA 300 MOHM	4990
L04022R7BHNTR Elco (AVX)	FIXED IND 2.7NH 250MA 250 MOHM	8094
LMLP0606M100CTAR Elco (AVX)	FIXED IND 10UH 850MA 500 MOHM	0
LMLP04B4M100CTAS Elco (AVX)	FIXED IND 10UH 840MA 180 MOHM	0
L08054R7BEWTR Elco (AVX)	FIXED IND 4.7NH 750MA 100 MOHM	0
LMLP04B4M150CTAS Elco (AVX)	FIXED IND 15UH 650MA 280 MOHM	0
LMLP0405MR56DTAS Elco (AVX)	FIXED IND 560NH 6.5A 16MOHM SMD	2000
LCCI0201S3N9GTAR Elco (AVX)	FIXED IND 3.9NH 400MA 300 MOHM	15000
LMXS06C6M100FTAS Elco (AVX)	FIXED IND 10UH 1.3A 98 MOHM SMD	321
LMLP0404M220CTAS Elco (AVX)	FIXED IND 22UH 400MA 870 MOHM	0
LMLP07C7M1R0DTAS Elco (AVX)	FIXED IND 1UH 15A 6.5MOHM SMD	285
LMLP03B3N1R0CTAR Elco (AVX)	FIXED IND 1UH 2.1A 30 MOHM SMD	0
LMLP0506MR20DTAS Elco (AVX)	FIXED IND 200NH 18A 3.9MOHM SMD	1990
L08055R6CEWTR Elco (AVX)	FIXED IND 5.6NH 750MA 100 MOHM	0
LMLP03A2N6R8CTAR Elco (AVX)	FIXED IND 6.8UH 740MA 190 MOHM	0
L06038R2DGWTR Elco (AVX)	FIXED IND 8.2NH 300MA 350 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