Fixed Inductors

Image	Part Number	Description / PDF	Quantity
	L08058R2DEWTR Elco (AVX)	FIXED IND 8.2NH 750MA 120 MOHM	0
	HLC021R3BTTR Elco (AVX)	FIXED IND 1.3NH 725MA 130 MOHM	0
	L08051R8BEWTR Elco (AVX)	FIXED IND 1.8NH 1A 60 MOHM SMD	0
	LCCI0402S1N8GTAR Elco (AVX)	FIXED IND 1.8NH 900MA 120 MOHM	10000
	LMLP07B7MR22DTAS Elco (AVX)	FIXED IND 220NH 21A 3.2MOHM SMD	1495
	LMLP05B5N2R2CTAR Elco (AVX)	FIXED IND 2.2UH 2.9A 35 MOHM SMD	0
	LMLP06D6M220CTAS Elco (AVX)	FIXED IND 22UH 1.5A 115 MOHM SMD	1193
	LMXN0605M470DTAS Elco (AVX)	FIXED IND 47UH 720MA 370 MOHM	613
	LMLP07B7MR33DTAS Elco (AVX)	FIXED IND 330NH 18A 4.4MOHM SMD	1500
	LCCI0603JR27GTAR Elco (AVX)	FIXED IND 270NH 200MA 1.9 OHM	4000
$L0805120GEWTR\500$	L0805120GEWTR\500 Elco (AVX)	FIXED IND 12NH 750MA 200 MOHM	0
	LMLP07A7MR68DTAS Elco (AVX)	FIXED IND 680NH 15.5A 5.5 MOHM	766
	LMLP1313M1R2DTAS Elco (AVX)	FIXED IND 1.2UH 25A 3.5MOHM SMD	500
	LCCI0603J33NGTAR Elco (AVX)	FIXED IND 33NH 600MA 600 MOHM	4000
$L08058R2DEWTR\O$	L08058R2DEWTR\O Elco (AVX)	FIXED IND 8.2NH 750MA 120 MOHM	0
	LMLP0808M680CTAS Elco (AVX)	FIXED IND 68UH 1.1A 230 MOHM SMD	0
	LMLP03B3M330CTAR Elco (AVX)	FIXED IND 33UH 370MA 840 MOHM	0
	L08054R7DEWTR Elco (AVX)	FIXED IND 4.7NH 750MA 100 MOHM	0
	LMLP0707NR15DTAS Elco (AVX)	FIXED INDUCTOR 150NH SMD	1500
	LMLP0506MR47DTAS Elco (AVX)	FIXED IND 470NH 13.5A 8.5 MOHM	2000

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