Fixed Inductors

Part Number	Description / PDF	Quantity
LQW15AN3N3C80D TOKO / Murata	FIXED IND 3.3NH 2A 30 MOHM SMD	7735
LQM21NNR82K10D TOKO / Murata	FIXED IND 820NH 150MA 810 MOHM	2498
LQW04AN52NH20D TOKO / Murata	FIXED IND 52NH 120MA 2.28 OHM	9899
LQW15AN13NG80D TOKO / Murata	FIXED IND 13NH 1.24A 93 MOHM SMD	9960
LQW18AN73NG80D TOKO / Murata	FIXED IND 73NH 590MA 410 MOHM	0
LQP03TN2N4B02D TOKO / Murata	FIXED IND 2.4NH 500MA 200 MOHM	0
MBH10145C-5R6NA=P3 TOKO / Murata	FIXED IND 5.6UH 3.7A 22 MOHM	0
LQG15HH12NH02D TOKO / Murata	FIXED IND 12NH 500MA 280 MOHM	7618
LQW15AN2N2C10D TOKO / Murata	FIXED IND 2.2NH 1A 27 MOHM SMD	3103
LQG15WZ4N7S02D TOKO / Murata	FIXED IND 4.7NH 800MA 110 MOHM	4244
#B966AS-3R9N=P3 TOKO / Murata	FIXED IND 3.9UH 5.6A 17 MOHM SMD	0
LQH32PN100MNCL TOKO / Murata	FIXED IND 10UH 900MA 354 MOHM	3188
LQM18PN2R2MFRL TOKO / Murata	FIXED IND 2.2UH 750MA 375 MOHM	0
LQW2UAS33NJ0CL TOKO / Murata	FIXED IND 33NH 1A 140 MOHM SMD	399
LQP02HQ0N5C02E TOKO / Murata	FIXED IND 0.5NH 1A 40 MOHM SMD	0
LQG15WH7N3G02D TOKO / Murata	FIXED IND 7.3NH 600MA 170 MOHM	0
LQW15AN6N2B00D TOKO / Murata	FIXED IND 6.2NH 700MA 90 MOHM	33241
LQG15WH4N7C02D TOKO / Murata	FIXED IND 4.7NH 800MA 110 MOHM	6448
MBH12282C-6R8NA=P3 TOKO / Murata	FIXED IND 6.8UH 5.7A 18 MOHM	0
LQP02HQ1N4B02E TOKO / Murata	FIXED IND 1.4NH 700MA 80 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