Fixed Inductors

Part Number	Description / PDF	Quantity
LQP02TN4N1C02D TOKO / Murata	FIXED IND 4.1NH 180MA 1.3 OHM	0
LQW18AN24NG80D TOKO / Murata	FIXED IND 24NH 1.3A 86 MOHM SMD	5638
DFEG12060D-4R7M=P3 TOKO / Murata	FIXED IND 4.7UH 10A 11 MOHM SMD	404
LQH43NN2R2M03L TOKO / Murata	FIXED IND 2.2UH 500MA 300 MOHM	444
LQH2HPN6R8MDRL TOKO / Murata	FIXED IND 6.8UH 490MA 1.2 OHM	3904
LQW15AN5N1D10D TOKO / Murata	FIXED IND 5.1NH 800MA 51 MOHM	0
LQW2UASR47J00L TOKO / Murata	FIXED IND 470NH 470MA 1.19 OHM	1413
LQG18HH10NJ00D TOKO / Murata	FIXED IND 10NH 400MA 300 MOHM	3517
LQM2MPNR16MGHL TOKO / Murata	FIXED IND 160NH 4A 18 MOHM SMD	0
LQP02TN18NJ02D TOKO / Murata	FIXED IND 18NH 140MA 3.5 OHM SMD	0
LQW15CAR39K00D TOKO / Murata	FIXED IND 390NH 320MA 720 MOHM	10000
LQW18ANR18J00D TOKO / Murata	FIXED IND 180NH 140MA 2.2 OHM	1743
LQW2BHN3N3D13L TOKO / Murata	FIXED IND 3.3NH 1.7A 20 MOHM SMD	0
FDSD0630-H-5R6M=P3 TOKO / Murata	FIXED IND 5.6UH 4.2A 46 MOHM SMD	1000
LQW15AN2N9B0ZD TOKO / Murata	FIXED IND 2.9NH 750MA 70MOHM SMD	0
LQM21PN3R3NG0D TOKO / Murata	FIXED IND 3.3UH 800MA 207 MOHM	0
LQP02HQ9N1H02L TOKO / Murata	FIXED IND 9.1NH 300MA 500 MOHM	0
LQM18NN47NM00D TOKO / Murata	FIXED IND 47NH 50MA 300 MOHM SMD	19756
LQH2MCN4R7M02L TOKO / Murata	FIXED IND 4.7UH 300MA 1.04 OHM	41
LQG15WH19NG02D TOKO / Murata	FIXED IND 19NH 260MA 800 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