Fixed Inductors

Part Number	Description / PDF	Quantity
LQG15WZ5N1C02D TOKO / Murata	FIXED IND 5.1NH 800MA 120 MOHM	8196
LQW18AN13NJ00D TOKO / Murata	FIXED IND 13NH 600MA 130 MOHM	6786
LQP02TN0N9B02D TOKO / Murata	FIXED IND 0.9NH 320MA 500 MOHM	0
LQW18AN13NG00D TOKO / Murata	FIXED IND 13NH 600MA 130 MOHM	5015
LQP02HQ3N9C02L TOKO / Murata	FIXED IND 3.9NH 350MA 350 MOHM	0
LQW18AN58NJ80D TOKO / Murata	FIXED IND 58NH 700MA 300 MOHM	0
#B952AS-H-270M=P3 TOKO / Murata	FIXED IND 27UH 1.8A 100 MOHM SMD	305
LQP03TQ8N2J02D TOKO / Murata	FIXED IND 8.2NH 250MA 650 MOHM	13381
LQG15HSR27H02D TOKO / Murata	FIXED IND 270NH 110MA 4.94 OHM	27
LQW18ASR39J0ZD TOKO / Murata	FIXED IND 390NH 100MA 4.35 OHM	7360
LQW18AN22NJ80D TOKO / Murata	FIXED IND 22NH 1.3A 86 MOHM SMD	0
LQW18AS4N7J0ZD TOKO / Murata	FIXED IND 4.7NH 700MA 116 MOHM	3890
LQH31MN4R7K03L TOKO / Murata	FIXED IND 4.7UH 120MA 2.21 OHM	453
LQP03TN2N9B02D TOKO / Murata	FIXED IND 2.9NH 500MA 200 MOHM	9787
LQH43MN821J03L TOKO / Murata	FIXED IND 820UH 60MA 20.5 OHM	706
LQW15AN7N8G8ZD TOKO / Murata	FIXED IND 7.8NH 1.7A 50 MOHM	5705
LQW15CNR33K1ZD TOKO / Murata	FIXED IND 330NH 390MA 560 MOHM	8850
LQH2MPN470MGRL TOKO / Murata	FIXED IND 47UH 180MA 6.36 OHM	1395
LQW18CNR21J00D TOKO / Murata	FIXED IND 210NH 800MA 150 MOHM	9563
LQP03TQ3N1C02D TOKO / Murata	FIXED IND 3.1NH 450MA 240 MOHM	13990

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