Fixed Inductors

Part Number	Description / PDF	Quantity
DFE201610R-H-1R5M=P2 TOKO / Murata	FIXED IND 1.5UH 1.8A 110 MOHM	451
LQG15WH3N2S02D TOKO / Murata	FIXED IND 3.2NH 900MA 90 MOHM	9945
LQW18CA32NJ00D TOKO / Murata	FIXED IND 32NH 2.2A 30 MOHM SMD	3135
1273AS-H-4R7N=P3 TOKO / Murata	FIXED IND 4.7UH 4.9A 22.8 MOHM	0
LQW18AS3N9G0ZD TOKO / Murata	FIXED IND 3.9NH 700MA 80 MOHM	2738
LQP02HQ1N0C02E TOKO / Murata	FIXED IND 1NH 900MA 50 MOHM SMD	0
#B953AS-1R7N=P3 TOKO / Murata	FIXED IND 1.7UH 7.7A 10 MOHM SMD	697
LQH43MN471K03L TOKO / Murata	FIXED IND 470UH 80MA 11.8 OHM	177
LQW15CNR27K10D TOKO / Murata	FIXED IND 270NH 420MA 520 MOHM	0
MDH6045C-470MB=P3 TOKO / Murata	FIXED IND 47UH 1.1A 130MOHM SMD	913
LQW2UASR27F00L TOKO / Murata	FIXED IND 270NH 500MA 910 MOHM	835
LQH32DN680K23L TOKO / Murata	FIXED IND 68UH 130MA 2.86 OHM	0
LQG15WH3N0C02D TOKO / Murata	FIXED IND 3NH 900MA 80 MOHM SMD	6374
LQG15HN3N3S02D TOKO / Murata	FIXED IND 3.3NH 800MA 190 MOHM	14508
LQW2BAN20NJ00L TOKO / Murata	FIXED IND 20NH 2.2A 50 MOHM SMD	3262
LQW2UASR18F00L TOKO / Murata	FIXED IND 180NH 620MA 770 MOHM	283
LQP03TN7N5H02D TOKO / Murata	FIXED IND 7.5NH 300MA 600 MOHM	6615
LQW18AN34NJ80D TOKO / Murata	FIXED IND 34NH 1.05A 110 MOHM	0
FDSD0420-H-2R2M=P3 TOKO / Murata	FIXED IND 2.2UH 3.6A 47 MOHM SMD	3037
LQW15AN25NG8ZD TOKO / Murata	FIXED IND 25NH 750MA 221 MOHM	18903

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