Fixed Inductors

Image	Part Number	Description / PDF	Quantity
	HLC021R8BTTR Elco (AVX)	FIXED IND 1.8NH 626MA 160 MOHM	4981
	LMLP13B3M150DTAS Elco (AVX)	FIXED IND 15UH 6A 29MOHM SMD	391
	LMLP07B7M3R3DTAS Elco (AVX)	FIXED IND 3.3UH 6A 39MOHM SMD	1464
	HLC02120HTTR Elco (AVX)	FIXED IND 12NH 265MA 1.1 OHM SMD	376
$L08056R8DEWTR\O$	L08056R8DEWTR\O Elco (AVX)	FIXED IND 6.8NH 750MA 110 MOHM	0
	LMLP0404N2R2CTAS Elco (AVX)	FIXED IND 2.2UH 890MA 150 MOHM	0
	AL12B28N0GTR Elco (AVX)	FIXED IND 28NH 4A 6 MOHM SMD	489
	LMLP06C6N2R2CTAS Elco (AVX)	FIXED IND 2.2UH 3.7A 20 MOHM SMD	0
	LMLP0303M100CTAR Elco (AVX)	FIXED IND 10UH 510MA 450 MOHM	4000
	HLC022R0BTTR Elco (AVX)	FIXED IND 2NH 596MA 180 MOHM SMD	8407
	LMLP0404M470CTAS Elco (AVX)	FIXED IND 47UH 280MA 1.81 OHM	0
	LMLP1011MR47DTAS Elco (AVX)	FIXED IND 470NH 25A 1.55MOHM SMD	649
	LMLP0405M5R6DTAS Elco (AVX)	FIXED IND 5.6UH 1.8A 115MOHM SMD	1909
	LMLP1313MR10DTAS Elco (AVX)	FIXED IND 100NH 55A 600UOHM SMD	496
	LCCI0603J82NGTAR Elco (AVX)	FIXED IND 82NH 300MA 950 MOHM	4000
	LMLP0707M1R5DTAS Elco (AVX)	FIXED IND 1.5UH 7A 27MOHM SMD	15001500
	L06033R3CGSTR Elco (AVX)	FIXED IND 3.3NH 750MA 80 MOHM	732
	LMLP05D5M470CTAS Elco (AVX)	FIXED IND 47UH 900MA 310 MOHM	1440
	LMLP07A7M2R2DTAS Elco (AVX)	FIXED IND 2.2UH 8A 20MOHM SMD	9219000
	LMLP0707M220DTAS Elco (AVX)	FIXED IND 22UH 1.5A 280MOHM SMD	1350

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