Fixed Inductors

Part Number	Description / PDF	Quantity
SDEM25201B-4R7MS Delta Electronics	FIXED IND 4.7UH 1.6A 240MOHM SMD	5009
0402HM-5N8EBTS Delta Electronics	FIXED IND 5.8NH 700MA 120 MOHM	6583
VCMT104T-4R7MN5 Delta Electronics	FIXED IND 4.7UH 11A 15MOHM SMD	1042
0402HM-8N2EGTS Delta Electronics	FIXED IND 8.2NH 540MA 140 MOHM	7881
0402HM-1N5EKTS Delta Electronics	FIXED IND 1.5NH 1A 30 MOHM SMD	7970
0402HM-2N5ECTS Delta Electronics	FIXED IND 2.5NH 850MA 50 MOHM	7385
0402HP-360EGTS Delta Electronics	FIXED IND 36NH 480MA 360 MOHM	3899
0805CS-471EJFS Delta Electronics	FIXED IND 470NH 600MA 450 MOHM	2684
0805CS-360EJTS Delta Electronics	FIXED IND 36NH 500MA 270 MOHM	3880
SDEM25201B-100MS Delta Electronics	FIXED IND 10UH 1A 450MOHM SMD	1850
0402HM-220EGTS Delta Electronics	FIXED IND 22NH 310MA 300 MOHM	7870
VCMI105T-220MS5 Delta Electronics	FIXED IND 22UH 5.3A 69MOHM SMD	470
0402HP-250EGTS Delta Electronics	FIXED IND 25NH 600MA 250 MOHM	7530
0402HM-680EKTS Delta Electronics	FIXED IND 68NH 140MA 1.96OHM SMD	7970
0402HS-330EGTS Delta Electronics	FIXED IND 33NH 400MA 350 MOHM	7900
0805CS-301EJTS Delta Electronics	FIXED IND 300NH 330MA 1.2 OHM	3610
SDEM25201B-R47MS Delta Electronics	FIXED IND 470NH 4.2A 32MOHM SMD	3576
0402HP-220EGTS Delta Electronics	FIXED IND 22NH 800MA 160 MOHM	4600
0402HS-120EKTS Delta Electronics	FIXED IND 12NH 640MA 120MOHM SMD	8000
0805CS-431EGTS Delta Electronics	FIXED IND 430NH 230MA 1.7 OHM	50

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