Fixed Inductors

Part Number	Description / PDF	Quantity
83172C Murata Power Solutions	FIXED IND 1.7UH 1.55A 73 MOHM	0
27T334C Murata Power Solutions	FIXED IND 330UH 130MA 15 OHM SMD	0
27472C Murata Power Solutions	FIXED IND 4.7UH 1.6A 100 MOHM	2986
48680SC Murata Power Solutions	FIXED IND 68UH 1.8A 145 MOHM	0
84105C Murata Power Solutions	FIXED IND 1MH 90MA 18 OHM SMD	7093
27683C Murata Power Solutions	FIXED IND 68UH 420MA 900 MOHM	0
23150C Murata Power Solutions	FIXED IND 15UH 860MA 210 MOHM	0
15332C Murata Power Solutions	FIXED IND 3.3UH 11.8A 5.76 MOHM	0
49100SC Murata Power Solutions	FIXED IND 10UH 5.1A 21 MOHM SMD	249
22R684MC Murata Power Solutions	FIXED IND 680UH 300MA 2.64 OHM	0
49102SC Murata Power Solutions	FIXED IND 1MH 500MA 1.5 OHM SMD	629
1447383C Murata Power Solutions	FIXED IND 47UH 8.3A 19 MOHM TH	45
49680SC Murata Power Solutions	FIXED IND 68UH 2A 100 MOHM SMD	170
17103C Murata Power Solutions	FIXED IND 10UH 1.8A 50 MOHM TH	0
45224C Murata Power Solutions	FIXED IND 220UH 500MA 1.55 OHM	11154
38L142C Murata Power Solutions	FIXED IND 1.4UH 12A 3.7 MOHM SMD	0
82153C Murata Power Solutions	FIXED IND 15UH 400MA 560 MOHM	17304
13R336C Murata Power Solutions	FIXED IND 33MH 60MA 68 OHM TH	2589
15102C Murata Power Solutions	FIXED IND 1UH 16.2A 2.76 MOHM	0
39U432C Murata Power Solutions	FIXED IND 4.3UH 8.2A 11.4 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