Fixed Inductors

Part Number	Description / PDF	Quantity
LQW15AN5N5B80D TOKO / Murata	FIXED IND 5.5NH 1.77A 40 MOHM	5446
LQP03TN1N1B02D TOKO / Murata	FIXED IND 1.1NH 750MA 100 MOHM	58150
LQW15AN36NG8ZD TOKO / Murata	FIXED IND 36NH 540MA 431 MOHM	5798
LQP03TQ0N8W02D TOKO / Murata	FIXED IND 0.8NH 1A 50 MOHM SMD	5413
LQW18AN78NJ8ZD TOKO / Murata	FIXED IND 78NH 590MA 410 MOHM	7294
LQP03TN5N6H02D TOKO / Murata	FIXED IND 5.6NH 350MA 400 MOHM	244653
MBH6045C-101MB=P3 TOKO / Murata	FIXED IND 100UH 830MA 408 MOHM	0
LQW2BAS1R0J00L TOKO / Murata	FIXED IND 1UH 170MA 2.4 OHM SMD	1845
LQW18AN75NG8ZD TOKO / Murata	FIXED IND 75NH 590MA 410 MOHM	5410
LQG15HZ68NH02D TOKO / Murata	FIXED IND 68NH 250MA 920 MOHM	1797
LQG15WZ40NH02D TOKO / Murata	FIXED IND 40NH 190MA 1.5 OHM SMD	0
LQG15WZ2N8C02D TOKO / Murata	FIXED IND 2.8NH 900MA 80 MOHM	0
LQP03TN4N7J02D TOKO / Murata	FIXED IND 4.7NH 350MA 400 MOHM	12400
LQW2UASR15F0CL TOKO / Murata	FIXED IND 150NH 580MA 700 MOHM	1985
LQW03AW8N7C00D TOKO / Murata	FIXED IND 8.7NH 290MA 420 MOHM	0
LQW2BAN62NG00L TOKO / Murata	FIXED IND 62NH 1.65A 120 MOHM	1607
LQW15AN7N6J8ZD TOKO / Murata	FIXED IND 7.6NH 1.7A 50 MOHM	9499
LQP03TN2N6C02D TOKO / Murata	FIXED IND 2.6NH 500MA 200 MOHM	0
LQW15AN7N8J80D TOKO / Murata	FIXED IND 7.8NH 1.7A 50 MOHM SMD	0
LQW2BHN3N3D03L TOKO / Murata	FIXED IND 3.3NH 910MA 50 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