Fixed Inductors

Part Number	Description / PDF	Quantity
LQP02TN0N6C02D TOKO / Murata	FIXED IND 0.6NH 320MA 500 MOHM	0
LQG15HS2N0S02D TOKO / Murata	FIXED IND 2NH 900MA 100 MOHM SMD	28832
LQG18HH6N2S00D TOKO / Murata	FIXED IND 6.2NH 430MA 200 MOHM	3322
LQH2HPZ1R5NJRL TOKO / Murata	FIXED IND 1.5UH 1.81A 90 MOHM	330
LQW18AN16NJ8ZD TOKO / Murata	FIXED IND 16NH 1.4A 75 MOHM SMD	6848
LQH43MN3R9M03L TOKO / Murata	FIXED IND 3.9UH 500MA 380 MOHM	366
LQW18ANR36G80D TOKO / Murata	FIXED IND 360NH 190MA 3.98 OHM	1943
LQG15HH7N5H02D TOKO / Murata	FIXED IND 7.5NH 550MA 240 MOHM	6483
LQH43CN1R5M03L TOKO / Murata	FIXED IND 1.5UH 1A 90 MOHM SMD	177
LQH3NPZ470MJRL TOKO / Murata	FIXED IND 47UH 240MA 1 OHM SMD	967
LQW18AN7N2G8ZD TOKO / Murata	FIXED IND 7.2NH 1.9A 40 MOHM	3720
LQG15WHR15H02D TOKO / Murata	FIXED IND 150NH 110MA 3 OHM SMD	0
LQW2UASR56F00L TOKO / Murata	FIXED IND 560NH 400MA 1.33 OHM	1265
LQW2BAS22NG00L TOKO / Murata	FIXED IND 22NH 500MA 220 MOHM	7442
LQP03TG1N1B02D TOKO / Murata	FIXED IND 1.1NH 600MA 150 MOHM	0
LQP03HQ7N5H02D TOKO / Murata	FIXED IND 7.5NH 400MA 300 MOHM	438
LQW15AN2N4D80D TOKO / Murata	FIXED IND 2.4NH 2.53A 22 MOHM	0
LQG15WHR13J02D TOKO / Murata	FIXED IND 130NH 110MA 2.9 OHM	9790
LQH55DN6R8M03L TOKO / Murata	FIXED IND 6.8UH 2A 103.6 MOHM	209
LQW31HN27NK03L TOKO / Murata	FIXED IND 27NH 560MA 51 MOHM SMD	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