Fixed Inductors

Part Number	Description / PDF	Quantity
244R7C Murata Power Solutions	FIXED IND 4.7UH 2.1A 50 MOHM SMD	1348
37301C Murata Power Solutions	FIXED IND 300NH 19.5A 0.9 MOHM	0
1415449C Murata Power Solutions	FIXED IND 150UH 4.9A 55 MOHM TH	106
18R474C Murata Power Solutions	FIXED IND 470UH 600MA 465 MOHM	62
36472C Murata Power Solutions	FIXED IND 4.7UH 3.6A 41 MOHM SMD	833
13R472C Murata Power Solutions	FIXED IND 4.7UH 4.3A 17 MOHM TH	213
11R683C Murata Power Solutions	FIXED IND 68UH 400MA 850 MOHM TH	359
19R224C Murata Power Solutions	FIXED IND 220UH 1.6A 162 MOHM	0
45102C Murata Power Solutions	FIXED IND 1UH 6A 14 MOHM SMD	1000
24151C Murata Power Solutions	FIXED IND 150UH 400MA 1.1 OHM	0
26S180C Murata Power Solutions	FIXED IND 18UH 2.32A 74 MOHM	0
19R684C Murata Power Solutions	FIXED IND 680UH 910MA 548 MOHM	142
27T152C Murata Power Solutions	FIXED IND 1.5UH 1.6A 100 MOHM	0
39H182C Murata Power Solutions	FIXED IND 1.8UH 13.5A 3.9 MOHM	0
13R223C Murata Power Solutions	FIXED IND 22UH 2A 70 MOHM TH	0
1433393C Murata Power Solutions	FIXED IND 33UH 9.3A 17 MOHM TH	8
49220SC Murata Power Solutions	FIXED IND 22UH 3.1A 42 MOHM SMD	0
22R105C Murata Power Solutions	FIXED IND 1MH 170MA 3.63 OHM TH	0
32151C Murata Power Solutions	FIXED IND 150UH 1.2A 117 MOHM TH	0
82102C Murata Power Solutions	FIXED IND 1UH 2A 58 MOHM SMD	2054

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