Fixed Inductors

Image	Part Number	Description / PDF	Quantity
	LCCI0603J39NGTAR Elco (AVX)	FIXED IND 39NH 500MA 650 MOHM	4000
	LMLP0303N4R7CTAR Elco (AVX)	FIXED IND 4.7UH 780MA 190 MOHM	3950
	LCCI0603J56NGTAR Elco (AVX)	FIXED IND 56NH 500MA 750 MOHM	4000
	LCCI0402J6N8GTAR Elco (AVX)	FIXED IND 6.8NH 600MA 250 MOHM	10000
	L08053R3DEWTR Elco (AVX)	FIXED IND 3.3NH 750MA 110 MOHM	0
	L06035R6CGSTR Elco (AVX)	FIXED IND 5.6NH 300MA 250 MOHM	24334
	HLC02320HTTR Elco (AVX)	FIXED IND 32NH 175MA 2.2 OHM SMD	13740
	HLQ022R0BTTR Elco (AVX)	FIXED IND 2NH 245MA 180 MOHM SMD	0
	LMLP0303M330CTAR Elco (AVX)	FIXED IND 33UH 275MA 1.55 OHM	0
	LMLP02032N3R3CTAR Elco (AVX)	FIXED INDUCTOR 3.3UH SMD	0
	LMLP06D6N6R3CTAS Elco (AVX)	FIXED IND 6.3UH 2.8A 38 MOHM SMD	0
	LMLP06A6M680CTAR Elco (AVX)	FIXED IND 68UH 410MA 1.35 OHM	0
	HL023R9BTTR Elco (AVX)	FIXED IND 3.9NH 314MA 294 MOHM	0
$L06038R2DGWTR\500$	L06038R2DGWTR\500 Elco (AVX)	FIXED IND 8.2NH 300MA 350 MOHM	0
	LCCI0402J47NGTAR Elco (AVX)	FIXED IND 47NH 200MA 1.1 OHM SMD	0
	LCCI0402B0N6GTAR Elco (AVX)	FIXED IND 0.6NH 1A 80 MOHM SMD	10000
	LMLP05A6MR47DTAS Elco (AVX)	FIXED IND 470NH 11.5A 8.6 MOHM	3000
	HLQ023R9BTTR Elco (AVX)	FIXED IND 3.9NH 200MA 400 MOHM	0
	LCCI0402J22NGTAR Elco (AVX)	FIXED IND 22NH 300MA 700 MOHM	0
	LMLP1313M4R7DTAS Elco (AVX)	FIXED IND 4.7UH 12A 15MOHM SMD	500

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