Fixed Inductors

Part Number	Description / PDF	Quantity
29104C Murata Power Solutions	FIXED IND 100UH 530MA 360 MOHM	0
45223C Murata Power Solutions	FIXED IND 22UH 1.35A 180 MOHM	25657
482R2C Murata Power Solutions	FIXED IND 2.2UH 8.3A 13.5 MOHM	0
22R156C Murata Power Solutions	FIXED IND 15MH 54MA 51.7 OHM TH	496
12RS103C Murata Power Solutions	FIXED IND 10UH 4.6A 23 MOHM TH	0
15683C Murata Power Solutions	FIXED IND 68UH 3.33A 70.3 MOHM	0
26101C Murata Power Solutions	FIXED IND 100UH 970MA 350 MOHM	500
30101AC Murata Power Solutions	FIXED IND 97NH 36A 0.35 MOHM SMD	0
1415605C Murata Power Solutions	FIXED IND 15MH 500MA 3.74 OHM TH	0
33100C Murata Power Solutions	FIXED IND 10UH 7.6A 20 MOHM TH	0
242R7C Murata Power Solutions	FIXED IND 2.7UH 2.6A 39 MOHM SMD	0
45281C Murata Power Solutions	FIXED IND 280NH 8A 9 MOHM SMD	0
45332C Murata Power Solutions	FIXED IND 3.3UH 3.7A 34 MOHM SMD	838
12LRS334C Murata Power Solutions	FIXED IND 330UH 630MA 860 MOHM	244
1410524C Murata Power Solutions	FIXED IND 1MH 2.4A 277 MOHM TH	1508
29103C Murata Power Solutions	FIXED IND 10UH 1.8A 45 MOHM SMD	0
18R685C Murata Power Solutions	FIXED IND 6.8MH 150MA 7 OHM TH	0
22R336MC Murata Power Solutions	FIXED IND 33MH 37MA 110 OHM SMD	2250
24S4R7C Murata Power Solutions	FIXED IND 4.7UH 2.39A 37 MOHM	0
30101BC Murata Power Solutions	FIXED IND 100NH 37A 0.42 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