Fixed Inductors

Part Number	Description / PDF	Quantity
FIT106-5-B Triad Magnetics	FIXED IND 93UH 8.1A 39.1 MOHM TH	0
RC-8 Triad Magnetics	FIXED IND 250UH 1.25A 210 MOHM	62706
AX104R-100 Triad Magnetics	FIXED IND 10UH 4.4A 35 MOHM SMD	0
C-80U Triad Magnetics	FIXED IND 24MH 20A 25 MOHM CHASS	1677
FIT106-1 Triad Magnetics	FIXED IND 253UH 4A 139 MOHM TH	427973
AX02-300R6 Triad Magnetics	FIXED IND 600NH 27A 0.95 MOHM	0
AX97-20331 Triad Magnetics	FIXED IND 330UH 300MA 2 OHM SMD	0
FIT50-2-B Triad Magnetics	FIXED IND 35.48UH 3.4A 57.8 MOHM	0
FIT68-7 Triad Magnetics	FIXED IND 18.64UH 8.1A 14.8 MOHM	280
AX97-304R7 Triad Magnetics	FIXED IND 4.7UH 6A 20 MOHM SMD	350
AX97-40100 Triad Magnetics	FIXED IND 10UH 6.5A 20 MOHM SMD	0
C-36X Triad Magnetics	FIXED IND 500MH 300MA 30OHM CHAS	182
AX97-40681 Triad Magnetics	FIXED IND 680UH 780MA 1 OHM SMD	0
AX97-40221 Triad Magnetics	FIXED IND 220UH 1.3A 330 MOHM	0
AX97-10101 Triad Magnetics	FIXED IND 100UH 280MA 1.98 OHM	0
FIT68-5-B Triad Magnetics	FIXED IND 33.15UH 5.7A 28.8 MOHM	0
C-85X Triad Magnetics	FIXED IND 1.5H 10MA 70 OHM CHASS	512
FIRCH-2-B Triad Magnetics	FIXED IND 3.05UH 9.7A 7.3 MOHM	2000
FIT44-4 Triad Magnetics	FIXED IND 8.06UH 4.8A 15.9 MOHM	4791441
FIRCH-5-B Triad Magnetics	FIXED IND 5.9UH 5.7A 18.5 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