Fixed Inductors

Part Number	Description / PDF	Quantity
0402HP-270EKTS Delta Electronics	FIXED IND 27NH 450MA 275MOHM SMD	7890
0402HM-300EGTS Delta Electronics	FIXED IND 30NH 270MA 580 MOHM	6847
0805CS-122EJFS Delta Electronics	FIXED IND 1.2UH 400MA 900 MOHM	4034
CML0306-6N2-HNH Delta Electronics	FIXED IND 6.2NH 250MA 600 MOHM	0
0402HP-400EKTS Delta Electronics	FIXED IND 40NH 450MA 430MOHM SMD	8000
0402HP-240EHTS Delta Electronics	FIXED IND 24NH 700MA 190MOHM SMD	7876
0805CS-561EJFS Delta Electronics	FIXED IND 560NH 550MA 450 MOHM	0
0805CT-220EJTS Delta Electronics	FIXED IND 22NH 800MA 150MOHM SMD	3840
SDEB12101T-2R2MSD Delta Electronics	FIXED IND 2.2UH 710MA 338MOHM SM	9570
0402HP-430EGTS Delta Electronics	FIXED IND 43NH 450MA 520 MOHM	7980
0805CT-390EKTS Delta Electronics	FIXED IND 39NH 600MA 330MOHM SMD	3998
0402HP-1N0EKTS Delta Electronics	FIXED IND 1NH 2.3A 30 MOHM SMD	7185
0402HS-220EKTS Delta Electronics	FIXED IND 22NH 400MA 300MOHM SMD	7950
CMLE063T-100MS Delta Electronics	FIXED IND 10UH 4.2A 66MOHM SMD	1378
0402HS-4N3EJTS Delta Electronics	FIXED IND 4.3NH 700MA 91 MOHM	7995
VCMT063T-150MN5T Delta Electronics	FIXED IND 15UH 3.2A 110MOHM SMD	3438
0805CS-472EJFS Delta Electronics	FIXED IND 4.7UH 200MA 2.1OHM SMD	3705
0402HM-4N7EJTS Delta Electronics	FIXED IND 4.7NH 750MA 70 MOHM	4931
0805CS-332EJFS Delta Electronics	FIXED IND 3.3UH 300MA 1.5OHM SMD	3933
0402HP-180EJTS Delta Electronics	FIXED IND 18NH 900MA 120 MOHM	7640

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