Fixed Inductors

Part Number	Description / PDF	Quantity
LQP02TN2N2C02D TOKO / Murata	FIXED IND 2.2NH 200MA 750 MOHM	0
LQW03AW4N7J00D TOKO / Murata	FIXED IND 4.7NH 620MA 90 MOHM	8133
LQW04AN6N2C00D TOKO / Murata	FIXED IND 6.2NH 390MA 190 MOHM	0
LQW15AN5N6D10D TOKO / Murata	FIXED IND 5.6NH 800MA 51 MOHM	5823
LQW18AS39NG0ZD TOKO / Murata	FIXED IND 39NH 600MA 250 MOHM	689
LQH43MN390K03L TOKO / Murata	FIXED IND 39UH 240MA 1.4 OHM SMD	0
LQH2MCN120K02L TOKO / Murata	FIXED IND 12UH 210MA 1.82 OHM	0
MDH10060C-680MA=P3 TOKO / Murata	FIXED IND 68UH 1.7A 91MOHM SMD	323
LQW2BASR33J00L TOKO / Murata	FIXED IND 330NH 310MA 1.4 OHM	60388
LQW15AN12NG00D TOKO / Murata	FIXED IND 12NH 500MA 140 MOHM	215934
LQM21NNR15K10D TOKO / Murata	FIXED IND 150NH 250MA 320 MOHM	679
LQG15WZ82NJ02D TOKO / Murata	FIXED IND 82NH 160MA 2.3 OHM SMD	9455
LQH2MPNR47NGRL TOKO / Murata	FIXED IND 470NH 1.06A 216 MOHM	0
LQP02HQ16NH02E TOKO / Murata	FIXED IND 16NH 170MA 1.53 OHM	0
LQW18AN4N7D0ZD TOKO / Murata	FIXED IND 4.7NH 850MA 59MOHM SMD	0
LQH44NN680K03L TOKO / Murata	FIXED IND 68UH 530MA 533 MOHM	214
LQW15CNR42J1ZD TOKO / Murata	FIXED IND 420NH 370MA 620 MOHM	8259
LQW2BAS39NJ00L TOKO / Murata	FIXED IND 39NH 500MA 290 MOHM	155
LQP03HQ2N3B02D TOKO / Murata	FIXED IND 2.3NH 600MA 120 MOHM	8711
LQH55DN102M03L TOKO / Murata	FIXED IND 1MH 150MA 14.42 OHM	118

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