Fixed Inductors

Part Number	Description / PDF	Quantity
0805CS-392EKFS Delta Electronics	FIXED IND 3.9UH 300MA 1.6OHM SMD	3985
0402HP-510EJTS Delta Electronics	FIXED IND 51NH 360MA 700MOHM SMD	7895
0805CS-251EGTS Delta Electronics	FIXED IND 250NH 350MA 1 OHM SMD	3578
0402HP-2N2EKTS Delta Electronics	FIXED IND 2.2NH 2.1A 38 MOHM SMD	7950
0402HM-7N3EJTS Delta Electronics	FIXED INDUCTOR 7.3NH 570MA SMD	7990
VCMT136E-330MN5 Delta Electronics	FIXED IND 33UH 5.5A 69MOHM SMD	854
0402HP-5N6EKTS Delta Electronics	FIXED IND 5.6NH 1.6A 48 MOHM SMD	7890
0402HS-190EGTS Delta Electronics	FIXED IND 19NH 480MA 202 MOHM	8000
0402HM-430EGTS Delta Electronics	FIXED IND 43NH 250MA 700 MOHM	7740
SDEM25201T-4R7MS Delta Electronics	FIXED IND 4.7UH 1.6A 258MOHM SMD	18520
0805CS-8N7EJTS Delta Electronics	FIXED IND 8.7NH 400MA 210 MOHM	3950
0402HS-1N8EKTS Delta Electronics	FIXED IND 1.8NH 1.04A 70 MOHM	7954
SDET25201B-1R0MS Delta Electronics	FIXED IND 1UH 2.65A 43MOHM SMD	3940
HTEH20120H-R47MSR Delta Electronics	FIXED IND 470NH 3.9A 33MOHM SMD	3000
0402HS-8N7EGTS Delta Electronics	FIXED IND 8.7NH 480MA 200 MOHM	7900
0402HS-4N7EGTS Delta Electronics	FIXED IND 4.7NH 640MA 130 MOHM	5857
0805CS-121EJFS Delta Electronics	FIXED IND 120NH 1.1A 180MOHM SMD	3456
0805CS-431EKTS Delta Electronics	FIXED IND 430NH 230MA 1.7 OHM	3986
0402HM-3N9EBTS Delta Electronics	FIXED IND 3.9NH 750MA 70 MOHM	7180
0805CT-103EKFS Delta Electronics	FIXED IND 10UH 400MA 2.7 OHM SMD	3950

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