Fixed Inductors

Part Number	Description / PDF	Quantity
48330C Murata Power Solutions	FIXED IND 33UH 2.1A 184 MOHM	0
27682C Murata Power Solutions	FIXED IND 6.8UH 1.4A 130 MOHM	0
12RS224C Murata Power Solutions	FIXED IND 220UH 1.1A 290 MOHM TH	145
46222C Murata Power Solutions	FIXED IND 2.2UH 5A 21 MOHM SMD	7834
17476C Murata Power Solutions	FIXED IND 47MH 30MA 154 OHM TH	0
26220C Murata Power Solutions	FIXED IND 22UH 1.95A 100 MOHM	0
19R475C Murata Power Solutions	FIXED IND 4.7MH 350MA 3.5 OHM TH	64
22R223C Murata Power Solutions	FIXED IND 22UH 1.08A 90 MOHM TH	4650
48150SC Murata Power Solutions	FIXED IND 15UH 3.7A 40 MOHM SMD	328
17105C Murata Power Solutions	FIXED IND 1MH 190MA 3.3 OHM TH	0
27T223C Murata Power Solutions	FIXED IND 22UH 500MA 850 MOHM	0
26S331C Murata Power Solutions	FIXED IND 330UH 570MA 800 MOHM	445
26180C Murata Power Solutions	FIXED IND 18UH 2.1A 87 MOHM SMD	0
37112C Murata Power Solutions	FIXED IND 1.1UH 14.5A 2.2 MOHM	0
29102C Murata Power Solutions	FIXED IND 1UH 6A 16 MOHM SMD	0
80301C Murata Power Solutions	FIXED IND 75UH 1A 100 MOHM TH	20
82223C Murata Power Solutions	FIXED IND 22UH 320MA 920 MOHM	9239
38S252C Murata Power Solutions	FIXED IND 2.5UH 7.2A 9.7 MOHM	0
1410604C Murata Power Solutions	FIXED IND 10MH 400MA 4.34 OHM TH	104
27T103C Murata Power Solutions	FIXED IND 10UH 700MA 410 MOHM	1056

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