Fixed Inductors

Part Number	Description / PDF	Quantity
29682C Murata Power Solutions	FIXED IND 6.8UH 2.1A 40 MOHM	0
19R104C Murata Power Solutions	FIXED IND 100UH 2.2A 90 MOHM TH	42
11R102C Murata Power Solutions	FIXED IND 1UH 3A 20 MOHM TH	576
34473C Murata Power Solutions	FIXED IND 47UH 410MA 850 MOHM	0
84473C Murata Power Solutions	FIXED IND 47UH 420MA 1.1 OHM SMD	1888
1447440C Murata Power Solutions	FIXED IND 470UH 4A 125 MOHM TH	705
23101C Murata Power Solutions	FIXED IND 100UH 430MA 1.281 OHM	1082
26330C Murata Power Solutions	FIXED IND 33UH 1.5A 120 MOHM	0
26S6R8C Murata Power Solutions	FIXED IND 6.8UH 3.21A 43 MOHM	0
1468507C Murata Power Solutions	FIXED IND 6.8MH 700MA 2.3 OHM TH	0
34474C Murata Power Solutions	FIXED IND 470UH 130MA 7.65 OHM	0
481R0C Murata Power Solutions	FIXED IND 1UH 12.3A 9 MOHM SMD	0
1430450C Murata Power Solutions	FIXED IND 300UH 5A 80 MOHM TH	61
38L432C Murata Power Solutions	FIXED IND 4.3UH 6.8A 9.7 MOHM	311
12RS474C Murata Power Solutions	FIXED IND 470UH 720MA 980 MOHM	0
46333C Murata Power Solutions	FIXED IND 33UH 1.45A 190 MOHM	2013
83683C Murata Power Solutions	FIXED IND 68UH 300MA 850 MOHM	0
19R336C Murata Power Solutions	FIXED IND 33MH 130MA 26 OHM TH	70
84154C Murata Power Solutions	FIXED IND 150UH 250MA 3.2 OHM	0
38L572C Murata Power Solutions	FIXED IND 5.7UH 5.8A 11.9 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