Fixed Inductors

Part Number	Description / PDF	Quantity
LQG15WH8N2J02D TOKO / Murata	FIXED IND 8.2NH 550MA 160 MOHM	9270
LQP02HQ1N0B02E TOKO / Murata	FIXED IND 1NH 900MA 50 MOHM SMD	0
FDSD0420-H-6R8M=P3 TOKO / Murata	FIXED IND 6.8UH 1.9A 150 MOHM	0
LQP15MN1N9W02D TOKO / Murata	FIXED IND 1.9NH 220MA 300 MOHM	8266
LQW18AN56NG0ZD TOKO / Murata	FIXED IND 56NH 360MA 350MOHM SMD	0
LQH2HPZ4R7MGRL TOKO / Murata	FIXED IND 4.7UH 1A 360 MOHM SMD	3489
LQW15AN1N7C00D TOKO / Murata	FIXED IND 1.7NH 640MA 100 MOHM	0
LQW2UAS22NF00L TOKO / Murata	FIXED IND 22NH 1A 120 MOHM SMD	102
LQW15AN68NJ8ZD TOKO / Murata	FIXED IND 68NH 320MA 1.128 OHM	9084
LQW18ANR15G00D TOKO / Murata	FIXED IND 150NH 160MA 1.5 OHM	51444
LQW18AS7N5J0ZD TOKO / Murata	FIXED IND 7.5NH 700MA 106 MOHM	2613
LQH43MN122K03L TOKO / Murata	FIXED IND 1.2MH 45MA 30 OHM SMD	0
LQW15AN4N2D80D TOKO / Murata	FIXED IND 4.2NH 1.8A 44 MOHM SMD	0
LQH43MN152K03L TOKO / Murata	FIXED IND 1.5MH 40MA 37 OHM SMD	300
DD1274AS-H-6R8N=P3 TOKO / Murata	FIXED IND 6.8UH 5.4A 21.3 MOHM	8
LQW15AN22NJ80D TOKO / Murata	FIXED IND 22NH 780MA 202 MOHM	1732
LQW31HN27NJ03L TOKO / Murata	FIXED IND 27NH 560MA 51 MOHM SMD	0
LQH2HPZ100MGRL TOKO / Murata	FIXED IND 10UH 710MA 672 MOHM	7924
LQH43PB100M26L TOKO / Murata	FIXED IND 10UH 620MA 176.4 MOHM	3605
DFE252010P-R47M=P2 TOKO / Murata	FIXED IND 470NH 5A 35 MOHM 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