Fixed Inductors

Part Number	Description / PDF	Quantity
0402HM-4N1EDTS Delta Electronics	FIXED IND 4.1NH 750MA 70 MOHM	7852
0805CS-7N5EJTS Delta Electronics	FIXED IND 7.5NH 600MA 140 MOHM	1868
CML0306-1N2-SNH Delta Electronics	FIXED IND 1.2NH 800MA 100 MOHM	0
VCMT136E-470MN5 Delta Electronics	FIXED IND 47UH 4.2A 104MOHM SMD	914
0402HM-4N7EKTS Delta Electronics	FIXED IND 4.7NH 750MA 70MOHM SMD	7735
0402HP-260EKTS Delta Electronics	FIXED IND 26NH 450MA 275MOHM SMD	8000
0402HS-2N7EKTS Delta Electronics	FIXED IND 2.7NH 640MA 120 MOHM	7990
0402HM-5N8ECTS Delta Electronics	FIXED IND 5.8NH 700MA 120 MOHM	7990
0805CS-822EKFS Delta Electronics	FIXED IND 8.2UH 180MA 3.3OHM SMD	3974
0805CS-431EJTS Delta Electronics	FIXED IND 430NH 230MA 1.7 OHM	3930
0402HP-2N0ECTS Delta Electronics	FIXED IND 2NH 2.1A 38 MOHM SMD	7058
CML0306-2N0-SNH Delta Electronics	FIXED IND 2NH 620MA 200 MOHM SMD	0
VCMT053T-100MN5 Delta Electronics	FIXED IND 10UH 2.5A 129.5 MOHM	1780
0402HM-5N1EBTS Delta Electronics	FIXED IND 5.1NH 600MA 120 MOHM	9580
0805CS-471EKTS Delta Electronics	FIXED IND 470NH 250MA 1.7 OHM	3520
0402HP-6N8EHTS Delta Electronics	FIXED IND 6.8NH 1.5A 55 MOHM SMD	7955
0805CS-331EJFS Delta Electronics	FIXED IND 330NH 650MA 350 MOHM	3820
0805CS-121EGTS Delta Electronics	FIXED IND 120NH 400MA 510 MOHM	1657
0402HS-510EGTS Delta Electronics	FIXED IND 51NH 100MA 820MOHM SMD	7990
0402HS-1N8EBTS Delta Electronics	FIXED IND 1.8NH 1.04A 70 MOHM	7158

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