Fixed Inductors

Part Number	Description / PDF	Quantity
34223C Murata Power Solutions	FIXED IND 22UH 530MA 360 MOHM	0
22R686C Murata Power Solutions	FIXED IND 68MH 18MA 242 OHM TH	198
13R103C Murata Power Solutions	FIXED IND 10UH 3A 31 MOHM TH	200
28152C Murata Power Solutions	FIXED IND 1.5UH 12.5A 3.6 MOHM	348
60B473C Murata Power Solutions	FIXED IND 47UH 10.5A 13 MOHM SMD	1064
11R222C Murata Power Solutions	FIXED IND 2.2UH 1.9A 50 MOHM TH	1904
13R686C Murata Power Solutions	FIXED IND 68MH 40MA 152 OHM TH	34702
41330C Murata Power Solutions	FIXED IND 33UH 2.7A 38 MOHM SMD	18
49221SC Murata Power Solutions	FIXED IND 220UH 1.1A 380 MOHM	0
46103C Murata Power Solutions	FIXED IND 10UH 2.4A 66 MOHM SMD	1820
492R2SC Murata Power Solutions	FIXED IND 2.2UH 9.8A 8 MOHM SMD	0
15682C Murata Power Solutions	FIXED IND 6.8UH 10.2A 8.04 MOHM	170
19R106C Murata Power Solutions	FIXED IND 10MH 230MA 7.3 OHM TH	109
15684C Murata Power Solutions	FIXED IND 680UH 1.12A 574 MOHM	0
39U562C Murata Power Solutions	FIXED IND 5.6UH 6.6A 13.5 MOHM	0
33680C Murata Power Solutions	FIXED IND 68UH 2.9A 57 MOHM TH	38
22R333C Murata Power Solutions	FIXED IND 33UH 900MA 140 MOHM TH	3853
60A782C Murata Power Solutions	FIXED IND 7.8UH 13.5A 6 MOHM SMD	0
60A103C Murata Power Solutions	FIXED IND 10.2UH 12A 7 MOHM SMD	104
60A273C Murata Power Solutions	FIXED IND 27UH 7.5A 15 MOHM SMD	89

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