Fixed Inductors

Part Number	Description / PDF	Quantity
0805CT-150EKTS Delta Electronics	FIXED IND 15NH 800MA 100MOHM SMD	3857
0402HM-121EGTS Delta Electronics	FIXED IND 120NH 110MA 2.66 OHM	7720
0805CS-181EJFS Delta Electronics	FIXED IND 180NH 800MA 200 MOHM	3610
0805CS-472EJTS Delta Electronics	FIXED IND 4.7UH 90MA 6.4 OHM SMD	3608
SDEB12101T-1R0MSD Delta Electronics	FIXED IND 1UH 1.05A 201MOHM SMD	2405
0805CS-5N6EKTS Delta Electronics	FIXED IND 5.6NH 600MA 80 MOHM	3922
SDET32251E-150MS Delta Electronics	FIXED IND 15UH 700MA 700MOHM SMD	3820
HMLB25201B-1R0MSR Delta Electronics	FIXED IND 1UH 3.1A 48MOHM SMD	4834
VCHA042A-6R8MS6 Delta Electronics	FIXED IND 6.8UH 2.9A 92.5 MOHM	3103
CMLE063T-R68MS Delta Electronics	FIXED IND 680NH 16.5A 5.2MOHM SM	1607
0402HP-390EJTS Delta Electronics	FIXED IND 39NH 450MA 430 MOHM	7650
0402HM-4N1EJTS Delta Electronics	FIXED IND 4.1NH 750MA 70 MOHM	8000
0402HS-3N3EKTS Delta Electronics	FIXED IND 3.3NH 840MA 66MOHM SMD	7930
0402HC-6N0EDTS Delta Electronics	FIXED IND 6NH 760MA 56 MOHM SMD	7995
SDEB12101T-R22MSD Delta Electronics	FIXED IND 220NH 1.9A 60MOHM SMD	3935
0402HS-1N9EKTS Delta Electronics	FIXED IND 1.9NH 1.04A 70 MOHM	7955
0402HM-7N0EDTS Delta Electronics	FIXED IND 7NH 570MA 130 MOHM SMD	7965
0805CT-8N2EJTS Delta Electronics	FIXED IND 8.2NH 800MA 80 MOHM	1910
VCMT104T-1R0MN5 Delta Electronics	FIXED IND 1UH 18A 3.1MOHM SMD	0
0402HP-6N2EGTS Delta Electronics	FIXED IND 6.2NH 1.6A 50 MOHM SMD	5790

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