Fixed Inductors

Part Number	Description / PDF	Quantity
45684C Murata Power Solutions	FIXED IND 680UH 260MA 5 OHM SMD	921
22R684C Murata Power Solutions	FIXED IND 680UH 250MA 2.64 OHM	304
22R103C Murata Power Solutions	FIXED IND 10UH 1.62A 50 MOHM TH	7327
13R334C Murata Power Solutions	FIXED IND 330UH 580MA 640 MOHM	1610
13R335C Murata Power Solutions	FIXED IND 3.3MH 190MA 7 OHM TH	757
38L801C Murata Power Solutions	FIXED IND 800NH 16A 2.5 MOHM SMD	0
493R3SC Murata Power Solutions	FIXED IND 3.3UH 8.4A 10 MOHM	0
84224C Murata Power Solutions	FIXED IND 220UH 200MA 4.6 OHM	1353
82152C Murata Power Solutions	FIXED IND 1.5UH 1.4A 68 MOHM SMD	1276
18105C Murata Power Solutions	FIXED IND 1MH 440MA 1 OHM TH	3
82474C Murata Power Solutions	FIXED IND 470UH 70MA 16.8 OHM	0
30800AC Murata Power Solutions	FIXED IND 80NH 37A 0.35 MOHM SMD	1
32470C Murata Power Solutions	FIXED IND 47UH 2.1A 42 MOHM TH	0
17474C Murata Power Solutions	FIXED IND 470UH 340MA 1.5 OHM TH	50
12LRS683C Murata Power Solutions	FIXED IND 68UH 1.6A 160 MOHM TH	0
13R225C Murata Power Solutions	FIXED IND 2.2MH 240MA 4.5 OHM TH	4532
1447423/4C Murata Power Solutions	FIXED IND	0
1410460/5C Murata Power Solutions	FIXED IND 100UH 6A 33 MOHM TH	0
6001C Murata Power Solutions	FIXED INDUCTOR ZXRD SMD	0
1433433/5C Murata Power Solutions	FIXED IND	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