Fixed Inductors

Part Number	Description / PDF	Quantity
22R104C Murata Power Solutions	FIXED IND 100UH 670MA 390 MOHM	3217
17336C Murata Power Solutions	FIXED IND 33MH 40MA 108 OHM TH	0
27334C Murata Power Solutions	FIXED IND 330UH 190MA 4.5 OHM	0
13R474C Murata Power Solutions	FIXED IND 470UH 450MA 1.05 OHM	1617
17224C Murata Power Solutions	FIXED IND 220UH 480MA 750 MOHM	0
12LRS333C Murata Power Solutions	FIXED IND 33UH 2.1A 110 MOHM TH	274
48471SC Murata Power Solutions	FIXED IND 470UH 760MA 900 MOHM	0
42103C Murata Power Solutions	FIXED IND 10.2UH 15.4A 6 MOHM	31
18155C Murata Power Solutions	FIXED IND 1.5MH 330MA 1.5 OHM TH	0
24S330C Murata Power Solutions	FIXED IND 33UH 900MA 190 MOHM	970
22R683MC Murata Power Solutions	FIXED IND 68UH 840MA 280 MOHM	0
84223C Murata Power Solutions	FIXED IND 22UH 600MA 600 MOHM	1990
18R105C Murata Power Solutions	FIXED IND 1MH 440MA 1 OHM TH	1
60A413C Murata Power Solutions	FIXED IND 41UH 5.6A 26 MOHM SMD	200
83751C Murata Power Solutions	FIXED IND 750NH 2.7A 30 MOHM SMD	0
11R473C Murata Power Solutions	FIXED IND 47UH 500MA 540 MOHM TH	425
22R474C Murata Power Solutions	FIXED IND 470UH 310MA 1.65 OHM	733
40470C Murata Power Solutions	FIXED IND 47UH 1.42A 79 MOHM	30
38H122C Murata Power Solutions	FIXED IND 1.2UH 9A 6.8 MOHM SMD	0
19R223C Murata Power Solutions	FIXED IND 22UH 4A 26 MOHM TH	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