Fixed Inductors

Part Number	Description / PDF	Quantity
LQG15WH51NG02D TOKO / Murata	FIXED IND 51NH 190MA 1.8 OHM SMD	0
LQP02TN3N1B02D TOKO / Murata	FIXED IND 3.1NH 180MA 1.3 OHM	0
LQH32CN471K23L TOKO / Murata	FIXED IND 470UH 60MA 24.7 OHM	3316
LQW15AN5N4G8ZD TOKO / Murata	FIXED IND 5.4NH 1.77A 40 MOHM	0
LQW2UASR12G00L TOKO / Murata	FIXED IND 120NH 650MA 630 MOHM	0
FDSD0518-H-3R3M=P3 TOKO / Murata	FIXED IND 3.3UH 3.4A 58 MOHM SMD	765
LQP03TG4N3J02D TOKO / Murata	FIXED IND 4.3NH 300MA 580 MOHM	7420
LQW18AN5N6C80D TOKO / Murata	FIXED IND 5.6NH 1.9A 40 MOHM SMD	0
LQH2HPN1R5NJRL TOKO / Murata	FIXED IND 1.5UH 1.08A 90 MOHM	1634
LQG15HS18NJ02D TOKO / Murata	FIXED IND 18NH 400MA 360 MOHM	40353
LQH32DN4R7M23L TOKO / Murata	FIXED IND 4.7UH 450MA 260 MOHM	3046
LQP03TG2N5B02D TOKO / Murata	FIXED IND 2.5NH 450MA 250 MOHM	0
LQW18AN75NJ80D TOKO / Murata	FIXED IND 75NH 590MA 410 MOHM	0
LQW18ASR27G0CD TOKO / Murata	FIXED IND 270NH 130MA 2.5 OHM	3945
LQW04AN6N2D00D TOKO / Murata	FIXED IND 6.2NH 390MA 190 MOHM	0
LQH43NN222J03L TOKO / Murata	FIXED IND 2.2MH 30MA 50 OHM SMD	1732
LQH66SN100M03L TOKO / Murata	FIXED IND 10UH 1.6A 50.4 MOHM	360
LQW2UAS47NG0CL TOKO / Murata	FIXED IND 47NH 1A 160 MOHM SMD	1959
MDH6045C-470MA=P3 TOKO / Murata	FIXED IND 47UH 1A 160MOHM SMD	0
LQW18AN6N8D10D TOKO / Murata	FIXED IND 6.8NH 900MA 45 MOHM	3968

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