Fixed Inductors

Part Number	Description / PDF	Quantity
SWS-0.44-252 Amgis	FIXED IND 252UH 440MA 900 MOHM	0
SH150S-0.46-78 Amgis	FIXED IND 78UH 460MA 800 MOHM	0
SH150S-0.36-375 Amgis	FIXED IND 375UH 360MA 1.3 OHM	0
SWF-0.85-680 Amgis	FIXED IND 680UH 850MA 1.25 OHM	0
SWC-3.0-220 Amgis	FIXED IND 220UH 3A 70 MOHM TH	0
SWC-3.00-25 Amgis	FIXED IND 25UH 3A 40 MOHM TH	0
SWT-0.90-330 Amgis	FIXED IND 330UH 900MA 740 MOHM	0
SH150T-0.67-115 Amgis	FIXED IND 115UH 670MA 400 MOHM	0
SH150S-0.45-26 Amgis	FIXED IND 26UH 450MA 620 MOHM	0
SH150S-1.81-168 Amgis	FIXED IND 168UH 1.81A 180 MOHM	0
SWC-3.0-47 Amgis	FIXED IND 47UH 3A 50 MOHM TH	0
SWS-0.20-118 Amgis	FIXED IND 118UH 200MA 1.8 OHM	0
SH150S-2.50-167 Amgis	FIXED IND 167UH 2.5A 140 MOHM	0
SWC-0.90-330 Amgis	FIXED IND 330UH 900MA 180 MOHM	0
SWC-3.0-330 Amgis	FIXED IND 330UH 3A 150 MOHM TH	0
SH50T-0.9-267 Amgis	FIXED IND 267UH 900MA 180 MOHM	0
SH150S-1.02-17 Amgis	FIXED IND 17UH 1.02A 100 MOHM	0
SWC-1.3-680 Amgis	FIXED IND 680UH 1.3A 200 MOHM TH	0
SWS-2.24-37 Amgis	FIXED IND 37UH 2.24A 100 MOHM	0
SH150T-1.87-53 Amgis	FIXED IND 53UH 1.87A 130 MOHM TH	210

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