Fixed Inductors

Part Number	Description / PDF	Quantity
LQP02HQ0N8C02L TOKO / Murata	FIXED IND 0.8NH 900MA 50 MOHM	0
LQP03TG0N3B02D TOKO / Murata	FIXED IND 0.3NH 850MA 80 MOHM	9868
MBH7045C-470MA=P3 TOKO / Murata	FIXED IND 47UH 1.3A 150 MOHM	0
LQW18AS24NJ0ZD TOKO / Murata	FIXED IND 24NH 700MA 135 MOHM	0
LQW04CAR12K00D TOKO / Murata	FIXED IND 120NH 510MA 280 MOHM	8273
LQW2BASR12J00L TOKO / Murata	FIXED IND 120NH 400MA 510 MOHM	1467
LQG15HS9N1H02D TOKO / Murata	FIXED IND 9.1NH 500MA 260 MOHM	4133
LQH43MN391J03L TOKO / Murata	FIXED IND 390UH 90MA 9.7 OHM SMD	503
LQG15WZ3N9C02D TOKO / Murata	FIXED IND 3.9NH 900MA 90 MOHM	2379
LQW15CN53NK1ZD TOKO / Murata	FIXED IND 53NH 1.3A 60 MOHM SMD	0
LQW15AN7N1J8ZD TOKO / Murata	FIXED IND 7.1NH 1.42A 69 MOHM	0
LQH44PNR68NGRL TOKO / Murata	FIXED IND 680NH 1.5A 51.6 MOHM	0
LQG15HSR18J02D TOKO / Murata	FIXED IND 180NH 150MA 3.38 OHM	7378
LQP15MN8N2B02D TOKO / Murata	FIXED IND 8.2NH 110MA 1.1 OHM	0
LQG15HZ2N4C02D TOKO / Murata	FIXED IND 2.4NH 850MA 110 MOHM	4525
LQP02TN3N6B02D TOKO / Murata	FIXED IND 3.6NH 180MA 1.3 OHM	0
LQW15AN4N3D80D TOKO / Murata	FIXED IND 4.3NH 1.8A 44 MOHM SMD	0
LQH43MN680K03L TOKO / Murata	FIXED IND 68UH 180MA 1.9 OHM SMD	51
LQW18CNR27J0ZD TOKO / Murata	FIXED IND 270NH 750MA 160 MOHM	2490
LQH31CN100K03L TOKO / Murata	FIXED IND 10UH 230MA 1.69 OHM	6392

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