Fixed Inductors

Part Number	Description / PDF	Quantity
MBH6045C-4R7NB=P3 TOKO / Murata	FIXED IND 4.7UH 3.2A 29.9 MOHM	0
LQP02HQ5N6H02L TOKO / Murata	FIXED IND 5.6NH 300MA 400 MOHM	0
LQW18AN91NJ00D TOKO / Murata	FIXED IND 91NH 230MA 640 MOHM	1370
LQG15WZ1N6C02D TOKO / Murata	FIXED IND 1.6NH 1A 40 MOHM SMD	9375
1285AS-H-R68M=P2 TOKO / Murata	FIXED IND 680NH 2.5A 72 MOHM SMD	2023
LQG15WH13NH02D TOKO / Murata	FIXED IND 13NH 400MA 260 MOHM	9163
1276AS-H-100M=P2 TOKO / Murata	FIXED IND 10UH 800MA 588 MOHM	0
LQW2UASR75G00L TOKO / Murata	FIXED IND 750NH 360MA 1.54 OHM	0
LQG15WH13NJ02D TOKO / Murata	FIXED IND 13NH 400MA 260 MOHM	9343
LQW15AWR18G80D TOKO / Murata	FIXED IND 180NH 260MA 2.2 OHM	0
LQP03TQ4N3H02D TOKO / Murata	FIXED IND 4.3NH 360MA 350 MOHM	848
LQW15AN3N7C8ZD TOKO / Murata	FIXED IND 3.7NH 1.95A 30 MOHM	7928
LQW15AN8N3J8ZD TOKO / Murata	FIXED IND 8.3NH 1.5A 69 MOHM	0
LQH32MN820K23L TOKO / Murata	FIXED IND 82UH 70MA 6.2 OHM SMD	0
LQW15AN6N4G80D TOKO / Murata	FIXED IND 6.4NH 1.38A 65 MOHM	0
LQW2UAS68NF00L TOKO / Murata	FIXED IND 68NH 1A 200 MOHM SMD	0
LQP03TG1N7B02D TOKO / Murata	FIXED IND 1.7NH 500MA 200 MOHM	0
LQG18HH3N3S00D TOKO / Murata	FIXED IND 3.3NH 500MA 150 MOHM	0
LQW15AN5N8D8ZD TOKO / Murata	FIXED IND 5.8NH 1.77A 40 MOHM	9976
LQG15WH24NH02D TOKO / Murata	FIXED IND 24NH 230MA 1.2 OHM SMD	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