Fixed Inductors

Image	Part Number	Description / PDF	Quantity
	HLQ022R4BTTR Elco (AVX)	FIXED IND 2.4NH 245MA 200 MOHM	0
	HLC021R6BTTR Elco (AVX)	FIXED IND 1.6NH 660MA 150 MOHM	5000
	LMLP04B4M151CTAS Elco (AVX)	FIXED IND 150UH 220MA 2.5 OHM	0
	LMLP06A6N6R8CTAR Elco (AVX)	FIXED IND 6.8UH 1.18A 165 MOHM	1000
	LMLP06D6N4R5CTAS Elco (AVX)	FIXED IND 4.5UH 3A 31 MOHM SMD	0
	LMXS0704M680DTAS Elco (AVX)	FIXED IND 68UH 400MA 290 MOHM	0
	HLC021R0BTTR Elco (AVX)	FIXED IND 1NH 800MA 100 MOHM SMD	0
	LCCI0603JR22GTAR Elco (AVX)	FIXED IND 220NH 300MA 1.5 OHM	4000
	LMLP13B3M4R7DTAS Elco (AVX)	FIXED IND 4.7UH 13.5A 11.2MOHM	400
$L0805220JEWTR\3$	L0805220JEWTR\3 Elco (AVX)	FIXED IND 22NH 500MA 400 MOHM	0
	HL025R6BTTR Elco (AVX)	FIXED IND 5.6NH 295MA 394 MOHM	0
	LMLP0506M3R3DTAS Elco (AVX)	FIXED IND 3.3UH 5A 38MOHM SMD	4867
	LMLP0303N6R8CTAR Elco (AVX)	FIXED IND 6.8UH 630MA 300 MOHM	1940
	LMXS131JM220FTAS Elco (AVX)	FIXED IND 22UH 4A 32 MOHM SMD	415
	LCCI0201J39NGTAR Elco (AVX)	FIXED IND 39NH 120MA 2.4 OHM SMD	15000
	L06036R8DGWTR Elco (AVX)	FIXED IND 6.8NH 300MA 300 MOHM	0
	L08052R2BEWTR Elco (AVX)	FIXED IND 2.2NH 1A 70 MOHM SMD	0
	L0805220GEWTR Elco (AVX)	FIXED IND 22NH 500MA 400 MOHM	0
$L0201R56AHSTR\500$	L0201R56AHSTR\500 Elco (AVX)	FIXED IND 0.56NH 500MA 100 MOHM	23353
	LCCI0603JR12GTAR Elco (AVX)	FIXED IND 120NH 300MA 1.2 OHM	4000

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