Fixed Inductors

Part Number	Description / PDF	Quantity
LQG15WHR11H02D TOKO / Murata	FIXED IND 110NH 150MA 2.7 OHM	0
LQW15AN3N3G8ZD TOKO / Murata	FIXED IND 3.3NH 2A 30 MOHM SMD	26246
LQW03AW9N1C00D TOKO / Murata	FIXED IND 9.1NH 460MA 220 MOHM	0
#B966BS-270M=P3 TOKO / Murata	FIXED IND 27UH 2.3A 74 MOHM SMD	970
LQP03TN1N5C02D TOKO / Murata	FIXED IND 1.5NH 600MA 150 MOHM	14998
LQW04AN4N3C00D TOKO / Murata	FIXED IND 4.3NH 530MA 100 MOHM	0
LQH43CNR56M33L TOKO / Murata	FIXED IND 560NH 2.95A 30 MOHM	0
LQH66SN1R0M03L TOKO / Murata	FIXED IND 1UH 4.7A 18.2 MOHM SMD	300
LQW2BASR15G00L TOKO / Murata	FIXED IND 150NH 400MA 560 MOHM	9665
LQW18AN33NG0ZD TOKO / Murata	FIXED IND 33NH 420MA 230MOHM SMD	0
LQP03TQ3N0B02D TOKO / Murata	FIXED IND 3NH 500MA 200 MOHM	83541
LQW31HN47NJ03L TOKO / Murata	FIXED IND 47NH 380MA 154 MOHM	3042
DFE252012F-6R8M=P2 TOKO / Murata	FIXED IND 6.8UH 1.2A 330 MOHM	1814
LQW18AN68NG00D TOKO / Murata	FIXED IND 68NH 340MA 380 MOHM	21893
LQG15WH5N8B02D TOKO / Murata	FIXED IND 5.8NH 700MA 130 MOHM	0
LQG15WH2N8B02D TOKO / Murata	FIXED IND 2.8NH 900MA 80 MOHM	0
LQW15AN2N2D10D TOKO / Murata	FIXED IND 2.2NH 1A 27 MOHM SMD	1559
DFEH10040D-6R8M=P3 TOKO / Murata	FIXED IND 6.8UH 6.4A 23 MOHM	136
LQH31HNR21K03L TOKO / Murata	FIXED IND 215NH 520MA 143 MOHM	0
1226AS-H-6R8M=P2 TOKO / Murata	FIXED IND 6.8UH 1.2A 156 MOHM	870

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