Fixed Inductors

Part Number	Description / PDF	Quantity
#B966BS-180M=P3 TOKO / Murata	FIXED IND 18UH 2.6A 60 MOHM SMD	282
LQH32DN2R2M23L TOKO / Murata	FIXED IND 2.2UH 600MA 169 MOHM	0
LQP03HQ3N3B02D TOKO / Murata	FIXED IND 3.3NH 500MA 170 MOHM	380
LQM21PN1R0MEHD TOKO / Murata	FIXED IND 1UH 1.6A 107 MOHM SMD	1530
LQH2MPN680MGRL TOKO / Murata	FIXED IND 68UH 160MA 8.04 OHM	625
LQH32DN3R3M53L TOKO / Murata	FIXED IND 3.3UH 710MA 156 MOHM	2018
LQH3NPH330MMEL TOKO / Murata	FIXED IND 33UH 760MA POWRTRNAUTO	1595
LQW2BHN12NK13L TOKO / Murata	FIXED IND 12NH 1.1A 40 MOHM SMD	0
DD1274AS-H-8R2M=P3 TOKO / Murata	FIXED IND 8.2UH 4.8A 26.4 MOHM	0
LQH32DN220K23L TOKO / Murata	FIXED IND 22UH 250MA 923 MOHM	2074
LQG15WH2N1C02D TOKO / Murata	FIXED IND 2.1NH 1A 60 MOHM SMD	0
LQP03HQ6N2H02D TOKO / Murata	FIXED IND 6.2NH 400MA 250 MOHM	16532
LQG15HH1N3C02D TOKO / Murata	FIXED IND 1.3NH 1A 70 MOHM SMD	8770
LQH66SN4R7M03L TOKO / Murata	FIXED IND 4.7UH 2.2A 35 MOHM SMD	84
LQP02TN2N3C02D TOKO / Murata	FIXED IND 2.3NH 200MA 750 MOHM	0
LQW18ASR21J0ZD TOKO / Murata	FIXED IND 210NH 200MA 2.06 OHM	1260
LQG15HS1N8S02D TOKO / Murata	FIXED IND 1.8NH 950MA 100 MOHM	1614
LQW2BAN43NJ00L TOKO / Murata	FIXED IND 43NH 1.55A 120 MOHM	3390
LQW18AN82NJ80D TOKO / Murata	FIXED IND 82NH 550MA 500 MOHM	0
LQW15AN19NH00D TOKO / Murata	FIXED IND 19NH 370MA 270 MOHM	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