Fixed Inductors

Image	Part Number	Description / PDF	Quantity
	LMLP05A6M6R8DTAS Elco (AVX)	FIXED IND 6.8UH 2.4A 150MOHM SMD	3000
	L06034R7CGWTR Elco (AVX)	FIXED IND 4.7NH 500MA 150 MOHM	0
	LMLP07B7M2R2DTAS Elco (AVX)	FIXED IND 2.2UH 7A 28MOHM SMD	13401500
$L02013R3BHSTR\500$	L02013R3BHSTR\500 Elco (AVX)	FIXED IND 3.3NH 150MA 1 OHM SMD	0
	LMLP06D6N2R3CTAS Elco (AVX)	FIXED IND 2.3UH 3.5A 21 MOHM SMD	0
	HLC023R0BTTR Elco (AVX)	FIXED IND 3NH 497MA 300 MOHM SMD	0
	LMLP04B4M330CTAS Elco (AVX)	FIXED IND 33UH 490MA 530 MOHM	0
	LMLP05A6M100DTAS Elco (AVX)	FIXED IND 10UH 2.3A 199MOHM SMD	2993
	HLQ021R2BTTR Elco (AVX)	FIXED IND 1.2NH 330MA 110 MOHM	0
	LCCI0201S2N0GTAR Elco (AVX)	FIXED IND 2NH 450MA 200 MOHM SMD	15000
	LMLP04A4N3R3CTAS Elco (AVX)	FIXED IND 3.3UH 980MA 130 MOHM	0
	LMLP04B4N6R8CTAS Elco (AVX)	FIXED IND 6.8UH 1.06A 110 MOHM	3490
	LMLP13B3M1R5DTAS Elco (AVX)	FIXED IND 1.5UH 27A 3MOHM SMD	400
	LMLP07B7M4R7DTAS Elco (AVX)	FIXED IND 4.7UH 5.5A 50MOHM SMD	1490
	LMLP07B7M8R2DTAS Elco (AVX)	FIXED IND 8.2UH 3.6A 95MOHM SMD	1500
	HL02150GTTR Elco (AVX)	FIXED IND 15NH 200MA 904 MOHM	0
	LCCI0603J68NGTAR Elco (AVX)	FIXED IND 68NH 400MA 850 MOHM	4000
	LMXN1915M102CTAS Elco (AVX)	FIXED INDUCTOR 1MH 1.8 OHM SMD	231
	LCCI0603S1N5GTAR Elco (AVX)	FIXED IND 1.5NH 1A 100 MOHM SMD	0
	LMLP05A6M8R2DTAS Elco (AVX)	FIXED IND 8.2UH 2.3A 171MOHM SMD	2995

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