Fixed Inductors

Part Number	Description / PDF	Quantity
SDRH0830NT100 Viking Tech	FIXED IND 10UH 2.5A 47 MOHM SMD	1000
WL05JT18N Viking Tech	FIXED IND 18NH 600MA 200MOHM SMD	2000
SCDA2D15MTH3R3 Viking Tech	FIXED IND 3.3UH 1.1A 149 MOHM	1000
WL03JT6N8 Viking Tech	FIXED IND 6.8NH 700MA 110 MOHM	4000
WL05JTR43 Viking Tech	FIXED IND 430NH 230MA 1.7OHM SMD	2000
WL05GT6N8 Viking Tech	FIXED IND 6.8NH 600MA 110 MOHM	2000
WL05JT4R7 Viking Tech	FIXED IND 4.7NH 600MA 80MOHM SMD	2000
WL05JT2N7 Viking Tech	FIXED IND 2.7NH 800MA 60MOHM SMD	4000
WL05GT10N Viking Tech	FIXED IND 10NH 600MA 110MOHM SMD	0
PSDB1004NT150 Viking Tech	FIXED IND 15UH 3.6A 50 MOHM SMD	1500
WL05JT15N Viking Tech	FIXED IND 15NH 600MA 170MOHM SMD	0
WL05GTR15 Viking Tech	FIXED IND 150NH 400MA 560 MOHM	2000
PCS125MT180 Viking Tech	FIXED IND 18UH 3A 34 MOHM SMD	1200
WL05JTR36 Viking Tech	FIXED IND 360NH 300MA 1.45 OHM	2000
VLH322515-2R2M Viking Tech	FIXED IND 2.2UH 790MA 126 MOHM	2000
WL05GTR68 Viking Tech	FIXED IND 680NH 190MA 2.2OHM SMD	2000
WL03GT3N9 Viking Tech	FIXED IND 3.9NH 700MA 80MOHM SMD	0
WL08JT15N Viking Tech	FIXED IND 15NH 1A 110MOHM SMD	2000
WL05JT8N2 Viking Tech	FIXED IND 8.2NH 600MA 120 MOHM	2000
SCDA2D15MTL3R3 Viking Tech	FIXED IND 3.3UH 1.24A 91 MOHM	1000

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