Fixed Inductors

Part Number	Description / PDF	Quantity
LQW15AN6N1C8ZD TOKO / Murata	FIXED IND 6.1NH 1.6A 56 MOHM	9296
LQG15HS18NH02D TOKO / Murata	FIXED IND 18NH 400MA 360 MOHM	14816
LQW18AN72NG80D TOKO / Murata	FIXED IND 72NH 560MA 470 MOHM	0
LQP03TQ0N9B02D TOKO / Murata	FIXED IND 0.9NH 800MA 80 MOHM	11755
1255AY-270M=P3 TOKO / Murata	FIXED IND 27UH 1.8A 135 MOHM SMD	404
LQW15AN53NJ8ZD TOKO / Murata	FIXED IND 53NH 415MA 696 MOHM	9925
1267AY-1R0N=P3 TOKO / Murata	FIXED IND 1UH 10.4A 8.4 MOHM SMD	340
LQG18HN6N8J00D TOKO / Murata	FIXED IND 6.8NH 430MA 250 MOHM	71526
1269AS-H-4R7M=P2 TOKO / Murata	FIXED IND 4.7UH 1.3A 300 MOHM	16555
LQW18ASR15G00D TOKO / Murata	FIXED IND 150NH 280MA 920 MOHM	0
LQH32PB4R7NNCL TOKO / Murata	FIXED IND 4.7UH 610MA 186 MOHM	0
LQW18AN6N8G80D TOKO / Murata	FIXED IND 6.8NH 1.9A 40MOHM SMD	0
1276AS-H-6R8M=P2 TOKO / Murata	FIXED IND 6.8UH 1A 378 MOHM SMD	783
LQP03TG0N9B02D TOKO / Murata	FIXED IND 0.9NH 700MA 120 MOHM	0
LQW18AN9N1D00D TOKO / Murata	FIXED IND 9.1NH 650MA 110 MOHM	5760
LQW15AN3N9B8ZD TOKO / Murata	FIXED IND 3.9NH 1.95A 30 MOHM	7433
LQW15AN39NJ8ZD TOKO / Murata	FIXED IND 39NH 530MA 456 MOHM	0
LQH31MN1R5J03L TOKO / Murata	FIXED IND 1.5UH 155MA 1.3 OHM	1032
LQP02HQ0N3B02E TOKO / Murata	FIXED IND 0.3NH 1A 20 MOHM SMD	44265
LQG15WH22NG02D TOKO / Murata	FIXED IND 22NH 230MA 1.1 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