Fixed Inductors

Part Number	Description / PDF	Quantity
22R104MC Murata Power Solutions	FIXED IND 100UH 800MA 390 MOHM	0
11R472C Murata Power Solutions	FIXED IND 4.7UH 1.3A 90 MOHM TH	10191
15222C Murata Power Solutions	FIXED IND 2.2UH 15A 4.2 MOHM TH	0
33150C Murata Power Solutions	FIXED IND 15UH 6.2A 27 MOHM TH	26
24S180C Murata Power Solutions	FIXED IND 18UH 1.22A 91 MOHM	0
26S471C Murata Power Solutions	FIXED IND 470UH 480MA 1.2 OHM	0
496R8SC Murata Power Solutions	FIXED IND 6.8UH 6.2A 16 MOHM	385
27154C Murata Power Solutions	FIXED IND 150UH 280MA 2 OHM SMD	0
12LRS104C Murata Power Solutions	FIXED IND 100UH 1.4A 200 MOHM TH	6464
12RS105C Murata Power Solutions	FIXED IND 1MH 440MA 1.5 OHM TH	9522
18R683C Murata Power Solutions	FIXED IND 68UH 1.35A 70 MOHM TH	0
48220C Murata Power Solutions	FIXED IND 22UH 2.6A 119 MOHM	0
60B224C Murata Power Solutions	FIXED IND 220UH 5A 50 MOHM SMD	8654
39S402C Murata Power Solutions	FIXED IND 4UH 8.3A 5.4 MOHM SMD	0
18R335C Murata Power Solutions	FIXED IND 3.3MH 220MA 3.5 OHM TH	80
48221SC Murata Power Solutions	FIXED IND 220UH 1A 430 MOHM SMD	478
46334C Murata Power Solutions	FIXED IND 330UH 460MA 1.85 OHM	878
83852C Murata Power Solutions	FIXED IND 8.5UH 850MA 167 MOHM	0
84132C Murata Power Solutions	FIXED IND 1.3UH 2.5A 80 MOHM	0
23S470C Murata Power Solutions	FIXED IND 47UH 540MA 460 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