Fixed Inductors

Part Number	Description / PDF	Quantity
1447385C Murata Power Solutions	FIXED IND 47UH 8.5A 21 MOHM TH	742
48220SC Murata Power Solutions	FIXED IND 22UH 3.1A 53 MOHM SMD	0
34334C Murata Power Solutions	FIXED IND 330UH 150MA 4.55 OHM	0
38H202C Murata Power Solutions	FIXED IND 2UH 6.5A 11.8 MOHM SMD	0
1433512C Murata Power Solutions	FIXED IND 3.3MH 1.2A 930 MOHM	0
38S221C Murata Power Solutions	FIXED IND 220NH 18A 2.2 MOHM SMD	0
1447427C Murata Power Solutions	FIXED IND 470UH 2.7A 160 MOHM	125
60B154C Murata Power Solutions	FIXED IND 150UH 6A 38 MOHM SMD	2914
22R105MC Murata Power Solutions	FIXED IND 1MH 210MA 3.63 OHM SMD	0
34153C Murata Power Solutions	FIXED IND 15UH 680MA 280 MOHM	0
26S680C Murata Power Solutions	FIXED IND 68UH 1.26A 170 MOHM	0
47330C Murata Power Solutions	FIXED IND 33UH 1.8A 207 MOHM	0
12RS334C Murata Power Solutions	FIXED IND 330UH 850MA 510 MOHM	1013
12LRS475C Murata Power Solutions	FIXED IND 4.7MH 180MA 10.5 OHM	135
36332C Murata Power Solutions	FIXED IND 3.3UH 4.6A 35 MOHM SMD	0
12RS333C Murata Power Solutions	FIXED IND 33UH 2.7A 57 MOHM TH	260
60A582C Murata Power Solutions	FIXED IND 5.8UH 14.5A 5 MOHM SMD	1
84222C Murata Power Solutions	FIXED IND 2.2UH 2A 90 MOHM SMD	1552
28223C Murata Power Solutions	FIXED IND 22UH 3.85A 42 MOHM SMD	320
26S120C Murata Power Solutions	FIXED IND 12UH 2.55A 58 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