Fixed Inductors

Part Number	Description / PDF	Quantity
37142C Murata Power Solutions	FIXED IND 1.4UH 16A 1.9 MOHM SMD	0
27T332C Murata Power Solutions	FIXED IND 3.3UH 1.2A 160 MOHM	0
1410313C Murata Power Solutions	FIXED IND 10UH 13A 9 MOHM TH	70
12LRS106C Murata Power Solutions	FIXED IND 10MH 120MA 24 OHM TH	235
12LRS684C Murata Power Solutions	FIXED IND 680UH 500MA 1.65 OHM	167
29334C Murata Power Solutions	FIXED IND 330UH 320MA 1 OHM SMD	0
27T473C Murata Power Solutions	FIXED IND 47UH 320MA 1.8 OHM SMD	0
83332C Murata Power Solutions	FIXED IND 3.3UH 1.35A 98 MOHM	0
13R226C Murata Power Solutions	FIXED IND 22MH 70MA 48 OHM TH	627
27105C Murata Power Solutions	FIXED IND 1MH 110MA 14 OHM SMD	0
24S151C Murata Power Solutions	FIXED IND 150UH 420MA 860 MOHM	0
22R103MC Murata Power Solutions	FIXED IND 10UH 2.52A 50 MOHM SMD	214
38H252C Murata Power Solutions	FIXED IND 2.5UH 5.5A 15.1 MOHM	0
38S402C Murata Power Solutions	FIXED IND 4UH 5.5A 15.1 MOHM SMD	0
19R686C Murata Power Solutions	FIXED IND 68MH 90MA 57 OHM TH	56
1410460C Murata Power Solutions	FIXED IND 100UH 6A 33 MOHM TH	1874
26120C Murata Power Solutions	FIXED IND 12UH 2.42A 68 MOHM	0
26S3R3C Murata Power Solutions	FIXED IND 3.3UH 4.6A 33 MOHM	0
1468362C Murata Power Solutions	FIXED IND 68UH 6.2A 32 MOHM TH	519
12RS104C Murata Power Solutions	FIXED IND 100UH 1.4A 190 MOHM TH	647

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