Fixed Inductors

Part Number	Description / PDF	Quantity
0402HM-3N9EKTS Delta Electronics	FIXED IND 3.9NH 750MA 70MOHM SMD	7990
0805CS-562EKFS Delta Electronics	FIXED IND 5.6UH 250MA 2.3OHM SMD	3709
0402HS-6N2EKTS Delta Electronics	FIXED IND 6.2NH 760MA 83MOHM SMD	7990
0402HM-9N5EJTS Delta Electronics	FIXED IND 9.5NH 540MA 140 MOHM	6980
SDET25201T-6R8MS Delta Electronics	FIXED IND 6.8UH 810MA 485MOHM SM	3758
0402HP-2N0EKTS Delta Electronics	FIXED IND 2NH 2.1A 38 MOHM SMD	11961
0402HM-330EKTS Delta Electronics	FIXED IND 33NH 260MA 630MOHM SMD	7990
0805CS-100EGTS Delta Electronics	FIXED IND 10NH 600MA 100 MOHM	8904
CML0306-3N0-SNH Delta Electronics	FIXED IND 3NH 450MA 300 MOHM SMD	0
0402HP-220EHTS Delta Electronics	FIXED IND 22NH 800MA 160MOHM SMD	0
0402HP-2N4EKTS Delta Electronics	FIXED IND 2.4NH 2A 42 MOHM SMD	7990
0402HC-1N3ECTS Delta Electronics	FIXED IND 1.3NH 1.2A 17 MOHM SMD	7910
0402HM-6N2EDTS Delta Electronics	FIXED IND 6.2NH 700MA 90MOHM SMD	7990
0402HS-190EJTS Delta Electronics	FIXED IND 19NH 480MA 202 MOHM	8000
0805CS-910EJTS Delta Electronics	FIXED IND 91NH 400MA 480 MOHM	3941
0402HP-180EHTS Delta Electronics	FIXED IND 18NH 900MA 120MOHM SMD	7900
0805CS-562EJFS Delta Electronics	FIXED IND 5.6UH 250MA 2.3OHM SMD	3970
0402HS-200EKTS Delta Electronics	FIXED IND 20NH 420MA 250MOHM SMD	7990
0805CS-270EKTS Delta Electronics	FIXED IND 27NH 500MA 250 MOHM	3502
0402HM-5N8EKTS Delta Electronics	FIXED IND 5.8NH 700MA 120 MOHM	8000

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