Fixed Inductors

Part Number	Description / PDF	Quantity
83104C Murata Power Solutions	FIXED IND 100UH 240MA 1.32 OHM	0
37222C Murata Power Solutions	FIXED IND 2.2UH 11.5A 4 MOHM SMD	0
27T333C Murata Power Solutions	FIXED IND 33UH 400MA 1.3 OHM SMD	0
40680C Murata Power Solutions	FIXED IND 68UH 1.2A 148 MOHM	28
19R474C Murata Power Solutions	FIXED IND 470UH 1.09A 380 MOHM	0
36102C Murata Power Solutions	FIXED IND 1UH 9.5A 7.5 MOHM SMD	0
22R106MC Murata Power Solutions	FIXED IND 10MH 68MA 37.4 OHM SMD	369
11R332C Murata Power Solutions	FIXED IND 3.3UH 1.5A 70 MOHM TH	34595
46102C Murata Power Solutions	FIXED IND 1UH 6.8A 13 MOHM SMD	0
11R103C Murata Power Solutions	FIXED IND 10UH 950MA 140 MOHM TH	849
39U322C Murata Power Solutions	FIXED IND 3.2UH 9.7A 8 MOHM SMD	0
34332C Murata Power Solutions	FIXED IND 3.3UH 1.5A 80 MOHM	0
24680C Murata Power Solutions	FIXED IND 68UH 610MA 460 MOHM	0
24100C Murata Power Solutions	FIXED IND 10UH 1.44A 100 MOHM	3416
27T683C Murata Power Solutions	FIXED IND 68UH 280MA 2.5 OHM SMD	0
27T682C Murata Power Solutions	FIXED IND 6.8UH 850MA 320 MOHM	0
22R335MC Murata Power Solutions	FIXED IND 3.3MH 120MA 10 OHM SMD	71
40330C Murata Power Solutions	FIXED IND 33UH 1.66A 54 MOHM	30
82332C Murata Power Solutions	FIXED IND 3.3UH 950MA 138 MOHM	1
264R7C Murata Power Solutions	FIXED IND 4.7UH 3.6A 45 MOHM	452

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