Fixed Inductors

Part Number	Description / PDF	Quantity
LQH43MN820J03L TOKO / Murata	FIXED IND 82UH 170MA 2.2 OHM SMD	0
LQW2BANR11G00L TOKO / Murata	FIXED IND 110NH 970MA 380 MOHM	1490
LQH5BPB6R8NT0L TOKO / Murata	FIXED IND 6.8UH 1.65A 99.6 MOHM	543
LQP03TN1N4B02D TOKO / Murata	FIXED IND 1.4NH 600MA 150 MOHM	35950
LQW2UASR62F0CL TOKO / Murata	FIXED IND 620NH 300MA 1.4 OHM	1929
LQP02HQ3N3B02E TOKO / Murata	FIXED IND 3.3NH 400MA 250 MOHM	0
LQH44PN1R0NP0L TOKO / Murata	FIXED IND 1UH 2.45A 36 MOHM SMD	2867
LQW15AN2N4C8ZD TOKO / Murata	FIXED IND 2.4NH 2.53A 22 MOHM	6846
LQH43MN181J03L TOKO / Murata	FIXED IND 180UH 120MA 4.5 OHM	131
LQM18NN1R5K00D TOKO / Murata	FIXED IND 1.5UH 25MA 800 MOHM	3583
LQW18ANR16J00D TOKO / Murata	FIXED IND 160NH 150MA 2.1 OHM	7914
LQH2HPZ2R2MGRL TOKO / Murata	FIXED IND 2.2UH 1.47A 160.8 MOHM	2240
LQW2BHN82NG03L TOKO / Murata	FIXED IND 82NH 320MA 420 MOHM	0
1276AS-H-4R7M=P2 TOKO / Murata	FIXED IND 4.7UH 1.2A 264 MOHM	1689
LQG15WH2N8C02D TOKO / Murata	FIXED IND 2.8NH 900MA 80 MOHM	0
LQM18FN100M00D TOKO / Murata	FIXED IND 10UH 50MA 1.17 OHM SMD	21935
FDSD0420D-100M=P3 TOKO / Murata	FIXED IND 10UH 1.7A 200 MOHM	22
MBH12575C-221MA=P3 TOKO / Murata	FIXED IND 220UH 1.2A 300 MOHM	0
LQW15AN4N1C00D TOKO / Murata	FIXED IND 4.1NH 750MA 70 MOHM	96640
LQW18AN20NG0ZD TOKO / Murata	FIXED IND 20NH 550MA 160MOHM SMD	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