Fixed Inductors

Part Number	Description / PDF	Quantity
LQW18ANR10J80D TOKO / Murata	FIXED IND 100NH 490MA 630 MOHM	3450
LQW15AN6N6J80D TOKO / Murata	FIXED IND 6.6NH 1.28A 78 MOHM	0
LQW2BASR22G00L TOKO / Murata	FIXED IND 220NH 400MA 700 MOHM	0
LQH3NPH2R2MMEL TOKO / Murata	FIXED IND 2.2UH 2100MA POWRTRNAU	467
LQP15MN1N3W02D TOKO / Murata	FIXED IND 1.3NH 280MA 200 MOHM	0
LQP03TG13NJ02D TOKO / Murata	FIXED IND 13NH 170MA 1.82 OHM	0
LQW15AN4N3C00D TOKO / Murata	FIXED IND 4.3NH 750MA 70 MOHM	22958
LQP03HQ2N4C02D TOKO / Murata	FIXED IND 2.4NH 600MA 120 MOHM	6645
LQG15WH16NG02D TOKO / Murata	FIXED IND 16NH 260MA 800 MOHM	0
LQW18AN48NJ80D TOKO / Murata	FIXED IND 48NH 830MA 230 MOHM	0
LQP03TN3N1C02D TOKO / Murata	FIXED IND 3.1NH 450MA 250 MOHM	0
LQG15WH9N5G02D TOKO / Murata	FIXED IND 9.5NH 500MA 210 MOHM	0
LQH32PN1R0NNCL TOKO / Murata	FIXED IND 1UH 2.5A 43.2 MOHM SMD	0
LQW15AN91NG00D TOKO / Murata	FIXED IND 91NH 125MA 2.38 OHM	12979
LQH32NZ220J23L TOKO / Murata	FIXED IND 22UH 150MA 2.8 OHM SMD	1958
LQW15AN4N7D00D TOKO / Murata	FIXED IND 4.7NH 750MA 70 MOHM	10189
LQW15CAR32J00D TOKO / Murata	FIXED IND 320NH 420MA 410 MOHM	1334
LQW15AN6N7G8ZD TOKO / Murata	FIXED IND 6.7NH 1.28A 78 MOHM	9384
LQW18ANR20G00D TOKO / Murata	FIXED IND 200NH 120MA 2.4 OHM	3590
DFE201610E-R47M=P2 TOKO / Murata	FIXED IND 470NH 3.6A 32 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