Fixed Inductors

Part Number	Description / PDF	Quantity
19R683C Murata Power Solutions	FIXED IND 68UH 2.9A 55 MOHM TH	0
46541C Murata Power Solutions	FIXED IND 540NH 7.7A 10 MOHM SMD	0
49470C Murata Power Solutions	FIXED IND 47UH 2.1A 191 MOHM	316
45474C Murata Power Solutions	FIXED IND 470UH 320MA 3.25 OHM	382
48100SC Murata Power Solutions	FIXED IND 10UH 4.5A 28 MOHM SMD	707
18R104C Murata Power Solutions	FIXED IND 100UH 1.2A 100 MOHM TH	4
38S502C Murata Power Solutions	FIXED IND 5UH 4.9A 20.3 MOHM SMD	0
11R333C Murata Power Solutions	FIXED IND 33UH 550MA 420 MOHM TH	19
23S390C Murata Power Solutions	FIXED IND 39UH 600MA 370 MOHM	0
12RS684C Murata Power Solutions	FIXED IND 680UH 550MA 1.2 OHM TH	0
49101SC Murata Power Solutions	FIXED IND 100UH 1.6A 165 MOHM	848
60A363C Murata Power Solutions	FIXED IND 36UH 6.4A 20 MOHM SMD	149
29224C Murata Power Solutions	FIXED IND 220UH 380MA 760 MOHM	0
18R475C Murata Power Solutions	FIXED IND 4.7MH 200MA 4.6 OHM TH	52
1410606C Murata Power Solutions	FIXED IND 10MH 600MA 2.6 OHM TH	242
47150C Murata Power Solutions	FIXED IND 15UH 2.6A 106 MOHM	0
42282C Murata Power Solutions	FIXED IND 2.84UH 13.9A 3.5 MOHM	7
48150C Murata Power Solutions	FIXED IND 15UH 3.2A 77.4 MOHM	0
1447508C Murata Power Solutions	FIXED IND 4.7MH 800MA 1.6 OHM TH	0
39U142C Murata Power Solutions	FIXED IND 1.4UH 13.5A 3.9 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