Fixed Inductors

Image	Part Number	Description / PDF	Quantity
	L06033R3CGWTR Elco (AVX)	FIXED IND 3.3NH 750MA 80 MOHM	0
	LCCI0402S2N7GTAR Elco (AVX)	FIXED IND 2.7NH 800MA 160 MOHM	10000
	LMLP1011M150DTAS Elco (AVX)	FIXED IND 15UH 6.25A 45MOHM SMD	500500
	LMLP04A4M220CTAS Elco (AVX)	FIXED IND 22UH 540MA 480 MOHM	0
	LMLP0707M1R2DTAS Elco (AVX)	FIXED IND 1.2UH 7.5A 23MOHM SMD	1488
	LMLP0707MR68DTAS Elco (AVX)	FIXED IND 680NH 10.5A 10MOHM SMD	1500
	LMXS0606M471BTAS Elco (AVX)	FIXED IND 470UH 2.58 OHM SMD	0
	L06032R7CGWTR Elco (AVX)	FIXED IND 2.7NH 750MA 80 MOHM	0
	L08051R8DEWTR Elco (AVX)	FIXED IND 1.8NH 1A 60 MOHM SMD	0
	LMLP13B3M100DTAS Elco (AVX)	FIXED IND 10UH 10A 16.8MOHM SMD	386400
	LMLP0506M4R7DTAS Elco (AVX)	FIXED IND 4.7UH 3.5A 60MOHM SMD	17922000
	LMLP13B3M1R0DTAS Elco (AVX)	FIXED IND 1UH 32A 2MOHM SMD	400
	LMLP03B3N3R3CTAR Elco (AVX)	FIXED IND 3.3UH 1.23A 80MOHM SMD	965
	LMLP0808M330CTAS Elco (AVX)	FIXED IND 33UH 1.7A 100 MOHM SMD	0
	LMXN2216M470BTAS Elco (AVX)	FIXED IND 47UH 96 MOHM SMD	246
	AL12B35N5JTR Elco (AVX)	FIXED IND 35.5NH 4A 6.8 MOHM SMD	450
	L08052R7CEWTR Elco (AVX)	FIXED IND 2.7NH 1A 80 MOHM SMD	0
$L08056R8DEWTR\500$	L08056R8DEWTR\500 Elco (AVX)	FIXED IND 6.8NH 750MA 110 MOHM	0
	HLC023R9BTTR Elco (AVX)	FIXED IND 3.9NH 441MA 400 MOHM	0
	HL02320GTTR Elco (AVX)	FIXED IND 32NH 150MA 1.935 OHM	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