Fixed Inductors

Part Number	Description / PDF	Quantity
LQW15AN1N3C8ZD TOKO / Murata	FIXED IND 1.3NH 3.15A 12 MOHM	22102
LQP03TG12NJ02D TOKO / Murata	FIXED IND 12NH 180MA 1.78 OHM	0
LQG15WH62NH02D TOKO / Murata	FIXED IND 62NH 180MA 1.9 OHM SMD	0
LQP03TN15NJ02D TOKO / Murata	FIXED IND 15NH 250MA 700 MOHM	35718
LQP02HQ1N5B02L TOKO / Murata	FIXED IND 1.5NH 700MA 80 MOHM	0
LQP02HQ3N4B02L TOKO / Murata	FIXED IND 3.4NH 400MA 300 MOHM	0
LQH32CN561K23L TOKO / Murata	FIXED IND 560UH 60MA 28.6 OHM	1660
LQW15AW56NG80D TOKO / Murata	FIXED IND 56NH 480MA 520 MOHM	0
LQG15HN2N7S02D TOKO / Murata	FIXED IND 2.7NH 800MA 170 MOHM	14804
LQG15HS5N6S02D TOKO / Murata	FIXED IND 5.6NH 650MA 200 MOHM	25513
LQH43PN3R3M26L TOKO / Murata	FIXED IND 3.3UH 2.1A 62.4 MOHM	11
LQH3NPH101MMEL TOKO / Murata	FIXED IND 100UH 430MA POWRTRNAUT	9090
LQW15CNR56K10D TOKO / Murata	FIXED IND 560NH 300MA 710 MOHM	0
LQP02HQ3N1B02E TOKO / Murata	FIXED IND 3.1NH 400MA 250 MOHM	0
FDSD0630-H-4R7M=P3 TOKO / Murata	FIXED IND 4.7UH 4.7A 40 MOHM SMD	89
LQH32DN3R3M23L TOKO / Murata	FIXED IND 3.3UH 530MA 260 MOHM	0
LQP02TN1N4B02D TOKO / Murata	FIXED IND 1.4NH 220MA 600 MOHM	0
LQW2UAS68NF0CL TOKO / Murata	FIXED IND 68NH 1A 200 MOHM SMD	1980
1264EY-1R5N=P3 TOKO / Murata	FIXED IND 1.5UH 5.5A 14 MOHM	945
LQW04CAR45K00D TOKO / Murata	FIXED IND 450NH 200MA 1.23 OHM	9506

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