Fixed Inductors

Part Number	Description / PDF	Quantity
LQW15AN5N5B8ZD TOKO / Murata	FIXED IND 5.5NH 1.77A 40 MOHM	8365
LQP02HQ2N9B02L TOKO / Murata	FIXED IND 2.9NH 450MA 200 MOHM	0
LQP02HQ36NH02E TOKO / Murata	FIXED INDUCTOR 36NH 110MA SMD	14478
LQW15CNR20J0ZD TOKO / Murata	FIXED IND 200NH 390MA 470 MOHM	11887
LQW18AS18NJ0ZD TOKO / Murata	FIXED IND 18NH 700MA 170 MOHM	2397
LQH3NPH470MMEL TOKO / Murata	FIXED IND 47UH 610MA POWRTRNAUTO	7639
LQP02HQ30NH02E TOKO / Murata	FIXED INDUCTOR 30NH 120MA SMD	29376
LQH32CH220K53L TOKO / Murata	FIXED IND 22UH 250MA 710 MOHM	0
LQP03HQ3N5B02D TOKO / Murata	FIXED IND 3.5NH 500MA 170 MOHM	3290
LQW2UASR12J0CL TOKO / Murata	FIXED IND 120NH 650MA 630 MOHM	1634
LQW15AN5N7D8ZD TOKO / Murata	FIXED IND 5.7NH 1.77A 40 MOHM	0
LQG15WH82NH02D TOKO / Murata	FIXED IND 82NH 160MA 2.3 OHM SMD	0
LQP02HQ2N4W02L TOKO / Murata	FIXED IND 2.4NH 450MA 200 MOHM	29980
LQW15AN4N1B8ZD TOKO / Murata	FIXED IND 4.1NH 1.8A 44 MOHM	9711
LQW18AN18NG00D TOKO / Murata	FIXED IND 18NH 550MA 160 MOHM	1595
LQG18HHR27J00D TOKO / Murata	FIXED IND 270NH 200MA 1.9 OHM	716
LQW18AN6N0C8ZD TOKO / Murata	FIXED IND 6NH 1.9A 40 MOHM SMD	3965
LQH31MNR47K03L TOKO / Murata	FIXED IND 470NH 215MA 830 MOHM	0
LQW18AS72NG0ZD TOKO / Murata	FIXED IND 72NH 400MA 490 MOHM	2545
LQH66SN220M03L TOKO / Murata	FIXED IND 22UH 1.1A 121.8 MOHM	484

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