Fixed Inductors

Part Number	Description / PDF	Quantity
LQP03TQ3N4B02D TOKO / Murata	FIXED IND 3.4NH 450MA 250 MOHM	13806
LQW18AS24NG0ZD TOKO / Murata	FIXED IND 24NH 700MA 135 MOHM	7721
MBH6045C-3R3NA=P3 TOKO / Murata	FIXED IND 3.3UH 3.4A 31.2 MOHM	0
LQW2UAS12NG00L TOKO / Murata	FIXED IND 12NH 1A 90 MOHM SMD	0
LQW15AN4N7G80D TOKO / Murata	FIXED IND 4.7NH 1.2A 71 MOHM SMD	9975
LQH32PHR47NNCL TOKO / Murata	FIXED IND 470NH 2.9A 28.8 MOHM	1493
LQW2UASR27F0CL TOKO / Murata	FIXED IND 270NH 500MA 910 MOHM	1915
LQG18HN27NJ00D TOKO / Murata	FIXED IND 27NH 500MA 550 MOHM	7002
LQP02TN3N2C02D TOKO / Murata	FIXED IND 3.2NH 180MA 1.3 OHM	0
DFEH12060D-150M=P3 TOKO / Murata	FIXED IND 15UH 6.6A 28 MOHM SMD	46
LQW18AN2N2D0ZD TOKO / Murata	FIXED IND 2.2NH 700MA 42MOHM SMD	0
LQP03TQ0N8B02D TOKO / Murata	FIXED IND 0.8NH 1A 50 MOHM SMD	3344
LQW15AN39NH00D TOKO / Murata	FIXED IND 39NH 250MA 700 MOHM	10832
LQP02TN9N1H02D TOKO / Murata	FIXED IND 9.1NH 140MA 2.1 OHM	0
LQH32MN390K23L TOKO / Murata	FIXED IND 39UH 110MA 3.9 OHM SMD	0
LQG15WZ72NH02D TOKO / Murata	FIXED IND 72NH 160MA 2.2 OHM SMD	0
LQM2MPNR47MEHL TOKO / Murata	FIXED IND 470NH 2.2A 69 MOHM SMD	0
LQH66SN681M03L TOKO / Murata	FIXED IND 680UH 200MA 5.46 OHM	0
LQM21FN100M70L TOKO / Murata	FIXED IND 10UH 100MA 780 MOHM	0
LQW15AN56NJ80D TOKO / Murata	FIXED IND 56NH 340MA 996 MOHM	6585

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