Fixed Inductors

Part Number	Description / PDF	Quantity
LQW15AN1N3D10D TOKO / Murata	FIXED IND 1.3NH 1.2A 17 MOHM SMD	15176
1267AY-220M=P3 TOKO / Murata	FIXED IND 22UH 2.3A 74.4 MOHM	0
LQW15AN6N5J8ZD TOKO / Murata	FIXED IND 6.5NH 1.38A 65 MOHM	8453
LQG15HS8N2G02D TOKO / Murata	FIXED INDUCTOR 8.2NH 0402	19975
LQP03TQ1N4C02D TOKO / Murata	FIXED IND 1.4NH 700MA 100 MOHM	14880
LQH43MN821K03L TOKO / Murata	FIXED IND 820UH 60MA 20.5 OHM	361
LQW15AN39NJ0ZD TOKO / Murata	FIXED IND 39NH 250MA 700MOHM SMD	0
LQG15WH1N2S02D TOKO / Murata	FIXED IND 1.2NH 1.2A 30 MOHM	8768
LQW15AN82NG00D TOKO / Murata	FIXED IND 82NH 130MA 2.24 OHM	72403
#A915AY-100M=P3 TOKO / Murata	FIXED IND 10UH 1.49A 90 MOHM SMD	7967
LQW18AN4N2G8ZD TOKO / Murata	FIXED IND 4.2NH 2.2A 28 MOHM	0
LQG15WZ4N1C02D TOKO / Murata	FIXED IND 4.1NH 800MA 100 MOHM	0
LQW18AN43NJ00D TOKO / Murata	FIXED IND 43NH 380MA 290 MOHM	1427
LQW15AN3N4G8ZD TOKO / Murata	FIXED IND 3.4NH 1.95A 30 MOHM	2285
LQG15WH3N9C02D TOKO / Murata	FIXED IND 3.9NH 900MA 90 MOHM	6954
LQG15WZ12NJ02D TOKO / Murata	FIXED IND 12NH 450MA 240 MOHM	1701
DFE322520FD-1R5M=P2 TOKO / Murata	FIXED IND 1.5UH 3.4A 31 MOHM SMD	2827
LQH5BPN3R3N38L TOKO / Murata	FIXED IND 3.3UH 4A 21 MOHM SMD	0
LQG15WH23NJ02D TOKO / Murata	FIXED IND 23NH 230MA 1.1 OHM SMD	9945
LQH32NH101J23L TOKO / Murata	FIXED IND 100UH 95MA 4.38 OHM	1888

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