Fixed Inductors

Image	Part Number	Description / PDF	Quantity
	L0805220JEWTR Elco (AVX)	FIXED IND 22NH 500MA 400 MOHM	0
	LMLP03B3N2R2CTAR Elco (AVX)	FIXED IND 2.2UH 1.5A 60 MOHM SMD	0
	LMLP1011M100DTAS Elco (AVX)	FIXED IND 10UH 7.5A 30MOHM SMD	684
	L04025R6BHNTR Elco (AVX)	FIXED IND 5.6NH 200MA 650 MOHM	7539
	LMXS0704M471DTAS Elco (AVX)	FIXED IND 470UH 190MA 1.8 OHM	955
	HLQ023R0BTTR Elco (AVX)	FIXED IND 3NH 225MA 300 MOHM SMD	0
	L06031R5CGWTR Elco (AVX)	FIXED IND 1.5NH 1A 60 MOHM SMD	0
$L0201R47AHSTR\500$	L0201R47AHSTR\500 Elco (AVX)	FIXED IND 0.47NH 550MA 100 MOHM	2490
	HLQ02150HTTR Elco (AVX)	FIXED IND 15NH 110MA 1.2 OHM SMD	0
	LMLP13B3MR15DTAS Elco (AVX)	FIXED IND 150NH 55A 600UOHM SMD	400
	HL022R0BTTR Elco (AVX)	FIXED IND 2NH 335MA 168 MOHM SMD	0
	LMLP03B3M150CTAR Elco (AVX)	FIXED IND 15UH 560MA 360 MOHM	0
	LCCI0402J68NGTAR Elco (AVX)	FIXED IND 68NH 200MA 1.2 OHM SMD	0
	LMLP1011MR36DTAS Elco (AVX)	FIXED IND 360NH 34A 1.2MOHM SMD	500500
	LMLP0202M100CTAR Elco (AVX)	FIXED IND 10UH 450MA 690 MOHM	0
$L08052R7DEWTR\500$	L08052R7DEWTR\500 Elco (AVX)	FIXED IND 2.7NH 1A 80 MOHM SMD	0
	LMLP06A6M100CTAR Elco (AVX)	FIXED IND 10UH 1A 235 MOHM SMD	0
	HLQ023R6BTTR Elco (AVX)	FIXED IND 3.6NH 200MA 350 MOHM	0
	L08056R8DESTR Elco (AVX)	FIXED INDUCTOR	0
	L0805180GEWTR Elco (AVX)	FIXED IND 18NH 500MA 350 MOHM	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