Fixed Inductors

Part Number	Description / PDF	Quantity
39S822C Murata Power Solutions	FIXED IND 8.2UH 5.8A 11.4 MOHM	0
29L222C Murata Power Solutions	FIXED IND 2.2UH 3A 20 MOHM SMD	498
27T104C Murata Power Solutions	FIXED IND 100UH 230MA 3.5 OHM	0
17473C Murata Power Solutions	FIXED IND 47UH 860MA 200 MOHM	272
27T153C Murata Power Solutions	FIXED IND 15UH 600MA 550 MOHM	0
34154C Murata Power Solutions	FIXED IND 150UH 230MA 2.4 OHM	0
24180C Murata Power Solutions	FIXED IND 18UH 1.26A 150 MOHM	0
13R156C Murata Power Solutions	FIXED IND 15MH 80MA 31 OHM TH	0
32681C Murata Power Solutions	FIXED IND 680UH 550MA 377 MOHM	0
19R103C Murata Power Solutions	FIXED IND 10UH 6A 17 MOHM TH	160
1410478C Murata Power Solutions	FIXED IND 100UH 7.8A 40 MOHM TH	406
19R472C Murata Power Solutions	FIXED IND 4.7UH 7.8A 8 MOHM TH	72
46684C Murata Power Solutions	FIXED IND 680UH 320MA 3.9 OHM	289
24150C Murata Power Solutions	FIXED IND 15UH 1.3A 120 MOHM SMD	0
48331SC Murata Power Solutions	FIXED IND 330UH 850MA 630 MOHM	526
15105C Murata Power Solutions	FIXED IND 1MH 910MA 887 MOHM TH	0
49330C Murata Power Solutions	FIXED IND 33UH 2.5A 128 MOHM	92
49220C Murata Power Solutions	FIXED IND 22UH 3A 81 MOHM SMD	0
12LRS685C Murata Power Solutions	FIXED IND 6.8MH 150MA 15 OHM TH	102
24101C Murata Power Solutions	FIXED IND 100UH 520MA 700 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