Fixed Inductors

Part Number	Description / PDF	Quantity
0805CS-221EKTS Delta Electronics	FIXED IND 220NH 400MA 700 MOHM	3490
HMLQ20161T-2R2MDR Delta Electronics	FIXED IND 2.2UH 2.2A 150MOHM SMD	4637
0402HC-3N4EDTS Delta Electronics	FIXED IND 3.4NH 900MA 40 MOHM	7800
HTEK16080H-1R0MSR Delta Electronics	FIXED IND 1UH 2A 142MOHM SMD	6004
0402HP-470EKTS Delta Electronics	FIXED IND 47NH 420MA 580MOHM SMD	7900
0402HC-2N2ECTS Delta Electronics	FIXED IND 2.2NH 1A 27 MOHM SMD	6895
HMLB25201B-2R2MSR Delta Electronics	FIXED IND 2.2UH 2.3A 95MOHM SMD	5416
0402HM-160EGTS Delta Electronics	FIXED IND 16NH 370MA 240 MOHM	7678
0402HS-200EJTS Delta Electronics	FIXED IND 20NH 420MA 250MOHM SMD	8000
0402HS-820EJTS Delta Electronics	FIXED IND 82NH 50MA 1.55 OHM SMD	8000
0402HM-8N7EJTS Delta Electronics	FIXED IND 8.7NH 540MA 140 MOHM	8000
0805CS-391EGTS Delta Electronics	FIXED IND 390NH 290MA 1.5 OHM	3769
SDEM20161T-6R8MS Delta Electronics	FIXED IND 6.8UH 800MA 639MOHM SM	2880
VCMT063T-2R2MN5T Delta Electronics	FIXED IND 2.2UH 9A 16.5MOHM SMD	3400
0805CS-221EKFS Delta Electronics	FIXED IND 220NH 700MA 250 MOHM	3990
0402HP-9N0EJTS Delta Electronics	FIXED IND 9NH 1.4A 80 MOHM SMD	7880
0402HS-3N6EJTS Delta Electronics	FIXED IND 3.6NH 840MA 66 MOHM	7796
0805CS-681EGTS Delta Electronics	FIXED IND 680NH 190MA 2.2 OHM	1118
0805CS-271EGTS Delta Electronics	FIXED IND 270NH 350MA 1 OHM SMD	20
CML0306-3N3-SNH Delta Electronics	FIXED IND 3.3NH 450MA 300 MOHM	0

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