Fixed Inductors

Part Number	Description / PDF	Quantity
17683C Murata Power Solutions	FIXED IND 68UH 850MA 260 MOHM	14
36601C Murata Power Solutions	FIXED IND 600NH 12.5A 5 MOHM SMD	0
41221C Murata Power Solutions	FIXED IND 220UH 1.03A 377 MOHM	24
40220C Murata Power Solutions	FIXED IND 22UH 2.1A 35 MOHM SMD	29
37302C Murata Power Solutions	FIXED IND 3UH 9A 4.8 MOHM SMD	0
11R153C Murata Power Solutions	FIXED IND 15UH 800MA 190 MOHM TH	832
29152C Murata Power Solutions	FIXED IND 1.5UH 5.5A 18 MOHM	0
19R334C Murata Power Solutions	FIXED IND 330UH 1.34A 240 MOHM	0
82472C Murata Power Solutions	FIXED IND 4.7UH 800MA 190 MOHM	0
1433507C Murata Power Solutions	FIXED IND 3.3MH 700MA 1.428 OHM	49
29154C Murata Power Solutions	FIXED IND 150UH 470MA 500 MOHM	994
46472C Murata Power Solutions	FIXED IND 4.7UH 3.7A 37 MOHM	0
45103C Murata Power Solutions	FIXED IND 10UH 2.2A 82 MOHM SMD	2000
83103C Murata Power Solutions	FIXED IND 10UH 750MA 185 MOHM	4559
12LRS335C Murata Power Solutions	FIXED IND 3.3MH 200MA 8.7 OHM TH	0
48100C Murata Power Solutions	FIXED IND 10UH 3.9A 61.4 MOHM	485
32331C Murata Power Solutions	FIXED IND 330UH 780MA 215 MOHM	1014
23S100C Murata Power Solutions	FIXED IND 10UH 1.18A 87 MOHM	1600
33470C Murata Power Solutions	FIXED IND 47UH 3.5A 48 MOHM TH	110
49151C Murata Power Solutions	FIXED IND 150UH 1.15A 529 MOHM	435

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