Fixed Inductors

Part Number	Description / PDF	Quantity
LQW18AN24NJ80D TOKO / Murata	FIXED IND 24NH 1.3A 86 MOHM SMD	0
LQW15AN2N7B80D TOKO / Murata	FIXED IND 2.7NH 1.5A 47 MOHM SMD	0
LQG15HN1N0C02D TOKO / Murata	FIXED IND 1NH 1A 70 MOHM SMD	8331
LQW18ASR10J00D TOKO / Murata	FIXED IND 100NH 400MA 580 MOHM	0
LQH55DN680M03L TOKO / Murata	FIXED IND 68UH 640MA 938 MOHM	350
LQP02HQ0N8W02L TOKO / Murata	FIXED IND 0.8NH 900MA 50MOHM SMD	0
LQP02HQ0N4C02L TOKO / Murata	FIXED IND 0.4NH 1A 30MOHM SMD	0
1226AS-H-100M=P2 TOKO / Murata	FIXED IND 10UH 1A 216 MOHM SMD	98
LQG15HS6N8H02D TOKO / Murata	FIXED IND 6.8NH 600MA 220 MOHM	7298
FDSD0420D-6R8M=P3 TOKO / Murata	FIXED IND 6.8UH 1.9A 150 MOHM	0
DFE201210U-2R2M=P2 TOKO / Murata	FIXED IND 2.2UH 1.2A 228 MOHM	65
LQW18ANR39J80D TOKO / Murata	FIXED IND 390NH 190MA 4.23 OHM	0
DFEH12060D-6R8M=P3 TOKO / Murata	FIXED IND 6.8UH 9A 14 MOHM SMD	138
LQW18AN28NJ80D TOKO / Murata	FIXED IND 28NH 1.2A 98 MOHM SMD	0
#B953AS-331M=P3 TOKO / Murata	FIXED IND 330UH 830MA 495 MOHM	396
LQP03HQ9N1H02D TOKO / Murata	FIXED IND 9.1NH 300MA 400 MOHM	27701
LQP03PN2N2C02D TOKO / Murata	FIXED IND 2.2NH 1.4A 55 MOHM SMD	10355
LQW15AN27NJ80D TOKO / Murata	FIXED IND 27NH 680MA 288 MOHM	0
LQG15WH2N2S02D TOKO / Murata	FIXED IND 2.2NH 1A 60 MOHM SMD	8414
LQH3NPZ101MMEL TOKO / Murata	FIXED IND 100UH 270MA 1.908 OHM	1564

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