Fixed Inductors

Part Number	Description / PDF	Quantity
LQH2MCN820K02L TOKO / Murata	FIXED IND 82UH 90MA 9.75 OHM SMD	3506
LQH43CN1R0M03L TOKO / Murata	FIXED IND 1UH 1.08A 80 MOHM SMD	142
LQP03TG1N7C02D TOKO / Murata	FIXED IND 1.7NH 500MA 200 MOHM	1610
LQP03TN1N7C02D TOKO / Murata	FIXED IND 1.7NH 600MA 150 MOHM	0
MBH6045C-330MB=P3 TOKO / Murata	FIXED IND 33UH 1.5A 123.5 MOHM	0
1229AS-H-R68N=P3 TOKO / Murata	FIXED IND 680NH 2.25A 52 MOHM	0
LQG15WH15NJ02D TOKO / Murata	FIXED IND 15NH 400MA 280 MOHM	21887
LQP03TG5N1H02D TOKO / Murata	FIXED IND 5.1NH 250MA 720 MOHM	6191
LQW04AN1N1D00D TOKO / Murata	FIXED IND 1.1NH 990MA 30 MOHM	0
LQG15WZ6N8J02D TOKO / Murata	FIXED IND 6.8NH 700MA 140 MOHM	9800
LQH32MN820J23L TOKO / Murata	FIXED IND 82UH 70MA 6.2 OHM SMD	0
LQW2UAS18NJ00L TOKO / Murata	FIXED IND 18NH 1A 110 MOHM SMD	3135
LQW18ANR33G8ZD TOKO / Murata	FIXED IND 330NH 190MA 3.84 OHM	7558
LQM21NNR56K10D TOKO / Murata	FIXED IND 560NH 150MA 630 MOHM	10625
LQW2BAN27NJ00L TOKO / Murata	FIXED IND 27NH 2A 70 MOHM SMD	834
LQP02HQ1N2C02E TOKO / Murata	FIXED IND 1.2NH 800MA 1.1 OHM	0
LQH32MN3R3K23L TOKO / Murata	FIXED IND 3.3UH 300MA 1 OHM SMD	0
LQW2UAS39NG00L TOKO / Murata	FIXED IND 39NH 1A 150 MOHM SMD	0
LQW18AN28NJ8ZD TOKO / Murata	FIXED IND 28NH 1.2A 98 MOHM SMD	5518
LQH2HPN101MGRL TOKO / Murata	FIXED IND 100UH 150MA 7.08 OHM	972

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