Fixed Inductors

Part Number	Description / PDF	Quantity
AX97-10100 Triad Magnetics	FIXED IND 10UH 1A 220 MOHM SMD	5001500
AX97-10471 Triad Magnetics	FIXED IND 470UH 120MA 11.55 OHM	1500
AX104R-6R8 Triad Magnetics	FIXED IND 6.8UH 4.8A 19.5 MOHM	0
AX97-10331 Triad Magnetics	FIXED IND 330UH 150MA 6.9 OHM	0
RC-6-B Triad Magnetics	FIXED IND 560UH 800MA 600 MOHM	0
AX97-20680 Triad Magnetics	FIXED IND 68UH 700MA 420 MOHM	0
AX97-30100 Triad Magnetics	FIXED IND 10UH 4.6A 40 MOHM SMD	0
RC-7-B Triad Magnetics	FIXED IND 450UH 1A 420 MOHM TH	0
FIT68-3 Triad Magnetics	FIXED IND 54.81UH 4A 59.9 MOHM	10
FIT50-4-B Triad Magnetics	FIXED IND 21.65UH 4.8A 29.2 MOHM	0
FIT106-2-B Triad Magnetics	FIXED IND 197UH 4.8A 106 MOHM TH	0
C-59U Triad Magnetics	FIXED IND 10MH 12.5A 100 MOHM	47314
FIT80-2 Triad Magnetics	FIXED IND 107.5UH 4.8A 67.9 MOHM	6056
AX104R-680 Triad Magnetics	FIXED IND 68UH 1.5A 213 MOHM SMD	0
AX97-30680 Triad Magnetics	FIXED IND 68UH 1.8A 200 MOHM SMD	0
AX97-30220 Triad Magnetics	FIXED IND 22UH 3.1A 70 MOHM SMD	0
FIT80-5 Triad Magnetics	FIXED IND 47.7UH 8.1A 22.5 MOHM	365
FIT106-6-B Triad Magnetics	FIXED IND 70.05UH 9.7A 24 MOHM	7896
FIRCH-3 Triad Magnetics	FIXED IND 3.6UH 8.1A 9.95 MOHM	1556
C-40X Triad Magnetics	FIXED IND 320MH 600MA 10 OHM	179115

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