Fixed Inductors

Part Number	Description / PDF	Quantity
HLQ02180HTTR Elco (AVX)	FIXED IND 18NH 110MA 1.5 OHM SMD	0
LMLP05A6M2R2DTAS Elco (AVX)	FIXED IND 2.2UH 4.2A 50MOHM SMD	25003000
LMLP0707M150DTAS Elco (AVX)	FIXED IND 15UH 2.1A 210MOHM SMD	1487
LMLP03A2M330CTAR Elco (AVX)	FIXED IND 33UH 330MA 1.03 OHM	0
LMLP0506MR68DTAS Elco (AVX)	FIXED IND 680NH 8.5A 12MOHM SMD	19952000
HLQ02320HTTR Elco (AVX)	FIXED IND 32NH 85MA 2.2 OHM SMD	0
LMLP0303M220CTAR Elco (AVX)	FIXED IND 22UH 350MA 1.03 OHM	0
AL05A5N45GTR Elco (AVX)	FIXED IND 5.45NH 1.6A 8 MOHM SMD	0
LMXS101DN470LTAS Elco (AVX)	FIXED IND 47UH 2.1A 128 MOHM SMD	430
HLC021R1BTTR Elco (AVX)	FIXED IND 1.1NH 782MA 100 MOHM	0
LMLP05D5N1R5CTAS Elco (AVX)	FIXED IND 1.5UH 3.6A 20 MOHM SMD	0
LMXN0906MR47BTAS Elco (AVX)	FIXED IND 470NH SMD	0
LCCI0603JR10GTAR Elco (AVX)	FIXED IND 100NH 300MA 1 OHM SMD	4000
LMXS101DN100LTAS Elco (AVX)	FIXED IND 10UH 4.4A 35 MOHM SMD	0
L06034R7CGSTR Elco (AVX)	FIXED IND 4.7NH 500MA 150 MOHM	1927
LMLP04A4N6R8CTAS Elco (AVX)	FIXED IND 6.8UH 840MA 180 MOHM	0
L08052R7DEWTR Elco (AVX)	FIXED IND 2.7NH 1A 80 MOHM SMD	0
LMLP04B4M221CTAS Elco (AVX)	FIXED IND 220UH 170MA 4OHM SMD	3500
LCCI0201J33NGTAR Elco (AVX)	FIXED IND 33NH 120MA 2.1 OHM SMD	15000
LMLP03A2M100CTAR Elco (AVX)	FIXED IND 10UH 630MA 290 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