Fixed Inductors

Part Number	Description / PDF	Quantity
36232C Murata Power Solutions	FIXED IND 2.3UH 6A 20 MOHM SMD	0
1410605C Murata Power Solutions	FIXED IND 10MH 500MA 3.6 OHM TH	0
34333C Murata Power Solutions	FIXED IND 33UH 480MA 560 MOHM	0
11R154C Murata Power Solutions	FIXED IND 150UH 300MA 1.65 OHM	52
1422514C Murata Power Solutions	FIXED IND 2.2MH 1.4A 622 MOHM TH	186
11R682C Murata Power Solutions	FIXED IND 6.8UH 1.1A 100 MOHM TH	0
82683C Murata Power Solutions	FIXED IND 68UH 200MA 2.55 OHM	2663
34104C Murata Power Solutions	FIXED IND 100UH 280MA 1.7 OHM	0
19R154C Murata Power Solutions	FIXED IND 150UH 1.9A 129 MOHM	0
18R225C Murata Power Solutions	FIXED IND 2.2MH 300MA 2.2 OHM TH	0
60A233C Murata Power Solutions	FIXED IND 23UH 8.4A 12 MOHM SMD	48
84333C Murata Power Solutions	FIXED IND 33UH 550MA 860 MOHM	1974
24S101C Murata Power Solutions	FIXED IND 100UH 520MA 540 MOHM	2415
48101C Murata Power Solutions	FIXED IND 100UH 1.23A 503 MOHM	545
1433510C Murata Power Solutions	FIXED IND 3.3MH 1A 1.992 OHM TH	0
1433428C Murata Power Solutions	FIXED IND 330UH 2.8A 150 MOHM TH	2
27104C Murata Power Solutions	FIXED IND 100UH 350MA 1.3 OHM	0
22R223MC Murata Power Solutions	FIXED IND 22UH 1.81A 90 MOHM SMD	0
27333C Murata Power Solutions	FIXED IND 33UH 600MA 450 MOHM	0
49150C Murata Power Solutions	FIXED IND 15UH 3.7A 53 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