Fixed Inductors

Part Number	Description / PDF	Quantity
LQW18CAR27J00D TOKO / Murata	FIXED IND 270NH 900MA 150 MOHM	2978
LQH43MN2R2M03L TOKO / Murata	FIXED IND 2.2UH 500MA 300 MOHM	0
LQG15HN8N2J02D TOKO / Murata	FIXED IND 8.2NH 500MA 330 MOHM	20415
LQW18AN4N1G80D TOKO / Murata	FIXED IND 4.1NH 2.2A 28MOHM SMD	0
LQW18ANR27J80D TOKO / Murata	FIXED IND 270NH 260MA 2.42 OHM	0
LQG15WH0N7S02D TOKO / Murata	FIXED IND 0.7NH 1.2A 30 MOHM SMD	9770
LQH44PN6R8MJ0L TOKO / Murata	FIXED IND 6.8UH 860MA 172 MOHM	0
LQH32CN1R0M53L TOKO / Murata	FIXED IND 1UH 1A 78 MOHM SMD	6820
LQP03HQ3N4C02D TOKO / Murata	FIXED IND 3.4NH 500MA 170 MOHM	0
LQW2UAS33NG00L TOKO / Murata	FIXED IND 33NH 1A 140 MOHM SMD	0
LQW15AW51NH80D TOKO / Murata	FIXED IND 51NH 480MA 470 MOHM	0
DFE252010P-4R7M=P2 TOKO / Murata	FIXED IND 4.7UH 1.7A 270 MOHM	23
LQW15AN7N2G80D TOKO / Murata	FIXED IND 7.2NH 1.7A 50 MOHM SMD	417
LQW15AN11NG00D TOKO / Murata	FIXED IND 11NH 500MA 140 MOHM	222773
LQH32NH151J23L TOKO / Murata	FIXED IND 150UH 80MA 5.82 OHM	1612
LQW15AN8N2G8ZD TOKO / Murata	FIXED IND 8.2NH 1.5A 69 MOHM	1226
LQW15AN5N6D80D TOKO / Murata	FIXED IND 5.6NH 1.77A 40 MOHM	0
LQW15DN100M00D TOKO / Murata	FIXED IND 10UH 120MA 5.405 OHM	479
LQP03TQ3N0C02D TOKO / Murata	FIXED IND 3NH 500MA 200 MOHM	2730
LQG15WH19NH02D TOKO / Murata	FIXED IND 19NH 260MA 800 MOHM	0

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