Fixed Inductors

Part Number	Description / PDF	Quantity
15152C Murata Power Solutions	FIXED IND 1.5UH 14.9A 3.48 MOHM	0
12RS154C Murata Power Solutions	FIXED IND 150UH 1.25A 230 MOHM	0
42212C Murata Power Solutions	FIXED IND 2.1UH 11.5A 3.8 MOHM	56
60A163C Murata Power Solutions	FIXED IND 16UH 9.6A 9 MOHM SMD	91
233R3C Murata Power Solutions	FIXED IND 3.3UH 1.8A 58 MOHM SMD	0
1430430C Murata Power Solutions	FIXED IND 300UH 3A 140 MOHM TH	0
17226C Murata Power Solutions	FIXED IND 22MH 50MA 75 OHM TH	0
38S801C Murata Power Solutions	FIXED IND 800NH 12.5A 3.7 MOHM	0
80305C Murata Power Solutions	FIXED IND 30UH 2A 600 MOHM TH	16
15333C Murata Power Solutions	FIXED IND 33UH 5.08A 31.2 MOHM	141
45154C Murata Power Solutions	FIXED IND 150UH 580MA 1 OHM SMD	0
1430433C Murata Power Solutions	FIXED IND 300UH 3.3A 100 MOHM	0
17685C Murata Power Solutions	FIXED IND 6.8MH 80MA 20 OHM TH	0
32101C Murata Power Solutions	FIXED IND 100UH 1.4A 77 MOHM TH	16
83232C Murata Power Solutions	FIXED IND 2.3UH 1.4A 86 MOHM SMD	0
22R475MC Murata Power Solutions	FIXED IND 4.7MH 100MA 13.2 OHM	0
23S330C Murata Power Solutions	FIXED IND 33UH 650MA 241 MOHM	0
82334C Murata Power Solutions	FIXED IND 330UH 80MA 13.5 OHM	0
15153C Murata Power Solutions	FIXED IND 15UH 7.44A 15.5 MOHM	0
37392C Murata Power Solutions	FIXED IND 3.9UH 10A 4.2 MOHM SMD	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