Fixed Inductors

Part Number	Description / PDF	Quantity
LQP03TQ1N7C02D TOKO / Murata	FIXED IND 1.7NH 650MA 100 MOHM	0
LQM21NNR12K10D TOKO / Murata	FIXED IND 120NH 250MA 290 MOHM	601
LQW2BASR24J00L TOKO / Murata	FIXED IND 240NH 350MA 1 OHM SMD	115
LQW18AN5N6G8ZD TOKO / Murata	FIXED IND 5.6NH 1.9A 40 MOHM	3965
LQH2HPZ6R8MGRL TOKO / Murata	FIXED IND 6.8UH 860MA 474 MOHM	2886
LQP03TN1N5B02D TOKO / Murata	FIXED IND 1.5NH 600MA 150 MOHM	23595
LQG15WZ1N7C02D TOKO / Murata	FIXED IND 1.7NH 1A 40 MOHM SMD	0
LQW15AN5N9C8ZD TOKO / Murata	FIXED IND 5.9NH 1.77A 40 MOHM	9641
MDH6045C-151MB=P3 TOKO / Murata	FIXED IND 150UH 580MA 500 MOHM	1048
LQP03TG3N3C02D TOKO / Murata	FIXED IND 3.3NH 400MA 320 MOHM	9490
LQW15AN7N8G80D TOKO / Murata	FIXED IND 7.8NH 1.7A 50 MOHM SMD	0
LQG15WH3N4B02D TOKO / Murata	FIXED IND 3.4NH 900MA 90 MOHM	0
LQM21NNR39K10D TOKO / Murata	FIXED IND 390NH 200MA 530 MOHM	1515
LQG15HS2N2C02D TOKO / Murata	FIXED IND 2.2NH 900MA 90 MOHM	4626
LQG15WH1N7C02D TOKO / Murata	FIXED IND 1.7NH 1A 40 MOHM SMD	0
LQG15HN5N6C02D TOKO / Murata	FIXED IND 5.6NH 600MA 180 MOHM	5089
LQP03TQ2N3B02D TOKO / Murata	FIXED IND 2.3NH 550MA 150 MOHM	9995
LQW31HN84NJ03L TOKO / Murata	FIXED IND 84NH 240MA 280 MOHM	0
LQH55DNR47M03L TOKO / Murata	FIXED IND 470NH 4.8A 18.2 MOHM	188
LQH44PH221MPRL TOKO / Murata	FIXED IND 220UH 280MA 3.78 OHM	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