Fixed Inductors

Part Number	Description / PDF	Quantity
24S2R7C Murata Power Solutions	FIXED IND 2.7UH 3.1A 28 MOHM	0
12LRS105C Murata Power Solutions	FIXED IND 1MH 400MA 2.3 OHM TH	1418
29153C Murata Power Solutions	FIXED IND 15UH 1.5A 65 MOHM SMD	644
48470C Murata Power Solutions	FIXED IND 47UH 1.8A 274 MOHM	597
83421C Murata Power Solutions	FIXED IND 420NH 3A 24 MOHM SMD	0
33471C Murata Power Solutions	FIXED IND 470UH 1.1A 152 MOHM TH	70
83823C Murata Power Solutions	FIXED IND 82UH 270MA 1.25 OHM	0
19R156C Murata Power Solutions	FIXED IND 15MH 190MA 12 OHM TH	9
22R106C Murata Power Solutions	FIXED IND 10MH 63MA 37.4 OHM TH	2737
12LRS154C Murata Power Solutions	FIXED IND 150UH 1A 350 MOHM TH	122
19R226C Murata Power Solutions	FIXED IND 22MH 150MA 22 OHM TH	150
39H102C Murata Power Solutions	FIXED IND 1UH 17.5A 2.5 MOHM SMD	0
26S4R7C Murata Power Solutions	FIXED IND 4.7UH 3.8A 38 MOHM	0
83122C Murata Power Solutions	FIXED IND 1.2UH 1.7A 65 MOHM SMD	0
45105C Murata Power Solutions	FIXED IND 1MH 230MA 6.5 OHM SMD	11936
26100C Murata Power Solutions	FIXED IND 10UH 2.6A 60 MOHM SMD	0
1410517C Murata Power Solutions	FIXED IND 1MH 1.7A 336 MOHM TH	87
48681SC Murata Power Solutions	FIXED IND 680UH 660MA 1.25 OHM	0
13R333C Murata Power Solutions	FIXED IND 33UH 1.8A 92 MOHM TH	4
38H301C Murata Power Solutions	FIXED IND 300NH 16A 2.2 MOHM 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