Fixed Inductors

Part Number	Description / PDF	Quantity
26S151C Murata Power Solutions	FIXED IND 150UH 850MA 400 MOHM	0
26S220C Murata Power Solutions	FIXED IND 22UH 2.2A 70 MOHM SMD	256
18R154C Murata Power Solutions	FIXED IND 150UH 1.1A 165 MOHM TH	49
83473C Murata Power Solutions	FIXED IND 47UH 350MA 710 MOHM	0
39H562C Murata Power Solutions	FIXED IND 5.6UH 8.2A 11.4 MOHM	0
22R683C Murata Power Solutions	FIXED IND 68UH 770MA 280 MOHM TH	2464
22R335C Murata Power Solutions	FIXED IND 3.3MH 100MA 11 OHM TH	1372
29333C Murata Power Solutions	FIXED IND 33UH 1A 120 MOHM SMD	443
1410516C Murata Power Solutions	FIXED IND 1MH 1.6A 460 MOHM TH	776
28225C Murata Power Solutions	FIXED IND 2.2MH 350MA 3.72 OHM	315
60B104C Murata Power Solutions	FIXED IND 100UH 7.5A 25 MOHM SMD	742
1468420C Murata Power Solutions	FIXED IND 680UH 2A 300 MOHM TH	359
32150C Murata Power Solutions	FIXED IND 15UH 3.7A 24 MOHM TH	0
22R686MC Murata Power Solutions	FIXED IND 68MH 26MA 242 OHM SMD	152239
23S120C Murata Power Solutions	FIXED IND 12UH 1.08A 107 MOHM	0
84155C Murata Power Solutions	FIXED IND 1.5MH 80MA 27 OHM SMD	0
18106C Murata Power Solutions	FIXED IND 10MH 130MA 12 OHM TH	7
33330C Murata Power Solutions	FIXED IND 33UH 4.2A 40 MOHM TH	0
82222C Murata Power Solutions	FIXED IND 2.2UH 1.1A 104 MOHM	1197
27T154C Murata Power Solutions	FIXED IND 150UH 170MA 5 OHM 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