Fixed Inductors

Part Number	Description / PDF	Quantity
DD1217AS-H-2R2N=P3 TOKO / Murata	FIXED IND 2.2UH 8.7A 9.9 MOHM	7421
LQG18HN2N2S00D TOKO / Murata	FIXED IND 2.2NH 1.1A 100 MOHM	11685
DFEG12060D-150M=P3 TOKO / Murata	FIXED IND 15UH 6.6A 28 MOHM SMD	476
LQW18AS16NJ0ZD TOKO / Murata	FIXED IND 16NH 700MA 104 MOHM	6303
LQG15WH27NH02D TOKO / Murata	FIXED IND 27NH 230MA 1.3 OHM SMD	0
LQW15AN4N7D10D TOKO / Murata	FIXED IND 4.7NH 800MA 51 MOHM	4422
LQW15CAR43K00D TOKO / Murata	FIXED IND 430NH 360MA 680 MOHM	9062
LQW15AN6N2C00D TOKO / Murata	FIXED IND 6.2NH 700MA 90 MOHM	3153
LQH32PH2R2NNCL TOKO / Murata	FIXED IND 2.2UH 1.85A 76.8 MOHM	1566
LQW15AN5N6C10D TOKO / Murata	FIXED IND 5.6NH 800MA 51 MOHM	188061
LQH3NPN1R0MGRL TOKO / Murata	FIXED IND 1UH 1.24A 74.4 MOHM	0
1239AS-H-1R0M=P2 TOKO / Murata	FIXED IND 1UH 3A 59 MOHM SMD	11430
LQH5BPN1R5NT0L TOKO / Murata	FIXED IND 1.5UH 3A 24 MOHM SMD	0
LQW15AN4N4C80D TOKO / Murata	FIXED IND 4.4NH 1.6A 52 MOHM SMD	0
MDH6045C-330MA=P3 TOKO / Murata	FIXED IND 33UH 1.2A 130MOHM SMD	0
LQW2UAS82NF0CL TOKO / Murata	FIXED IND 82NH 1A 220 MOHM SMD	1990
LQW18AN73NJ80D TOKO / Murata	FIXED IND 73NH 590MA 410 MOHM	0
LQP03TN10NJ02D TOKO / Murata	FIXED IND 10NH 250MA 700 MOHM	165000
LQG15HH33NG02D TOKO / Murata	FIXED INDUCTOR	0
LQH32NH680J23L TOKO / Murata	FIXED IND 68UH 125MA 2.7 OHM SMD	5575

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