Fixed Inductors

Part Number	Description / PDF	Quantity
49100C Murata Power Solutions	FIXED IND 10UH 4.5A 41 MOHM SMD	331
17684C Murata Power Solutions	FIXED IND 680UH 280MA 2.4 OHM TH	0
15104C Murata Power Solutions	FIXED IND 100UH 2.62A 110 MOHM	0
19R105C Murata Power Solutions	FIXED IND 1MH 730MA 844 MOHM TH	1243
1422604C Murata Power Solutions	FIXED IND 22MH 400MA 6.962 OHM	50
29472C Murata Power Solutions	FIXED IND 4.7UH 2.3A 30 MOHM SMD	0
18R684C Murata Power Solutions	FIXED IND 680UH 530MA 630 MOHM	0
23470C Murata Power Solutions	FIXED IND 47UH 550MA 683 MOHM	0
33101C Murata Power Solutions	FIXED IND 100UH 2.4A 70 MOHM TH	78
484R7SC Murata Power Solutions	FIXED IND 4.7UH 6.3A 16 MOHM	191
22R225C Murata Power Solutions	FIXED IND 2.2MH 110MA 8.58 OHM	7047
22R224C Murata Power Solutions	FIXED IND 220UH 430MA 830 MOHM	202
17333C Murata Power Solutions	FIXED IND 33UH 1A 130 MOHM TH	0
12LRS225C Murata Power Solutions	FIXED IND 2.2MH 280MA 4.6 OHM TH	47
1468508C Murata Power Solutions	FIXED IND 6.8MH 800MA 2.1 OHM TH	42
26S330C Murata Power Solutions	FIXED IND 33UH 1.8A 100 MOHM	0
26471C Murata Power Solutions	FIXED IND 470UH 420MA 1.48 OHM	0
13R682C Murata Power Solutions	FIXED IND 6.8UH 3.5A 23 MOHM TH	0
1415465C Murata Power Solutions	FIXED IND 150UH 6.5A 42 MOHM TH	3
47680C Murata Power Solutions	FIXED IND 68UH 1.22A 456 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