Fixed Inductors

Part Number	Description / PDF	Quantity
VCMT104T-6R8MN5 Delta Electronics	FIXED IND 6.8UH 8.5A 21.5MOHM SM	824
0805CT-180EGTS Delta Electronics	FIXED IND 18NH 800MA 130MOHM SMD	2892
0805CS-102EKFS Delta Electronics	FIXED IND 1UH 450MA 80 MOHM SMD	3390
0805CS-470EGTS Delta Electronics	FIXED IND 47NH 500MA 310 MOHM	3133
0805CT-270EGTS Delta Electronics	FIXED IND 27NH 600MA 230 MOHM	1839
0402HS-180EGTS Delta Electronics	FIXED IND 18NH 420MA 230 MOHM	7920
0805CS-820EKTS Delta Electronics	FIXED IND 82NH 400MA 420 MOHM	3618
0402HM-110EGTS Delta Electronics	FIXED IND 11NH 500MA 140 MOHM	5035
0402HM-8N2ECTS Delta Electronics	FIXED IND 8.2NH 540MA 140 MOHM	4057
SDEM25201T-1R5MS Delta Electronics	FIXED IND 1.5UH 2.5A 100MOHM SMD	3960
0402HP-9N5EHTS Delta Electronics	FIXED IND 9.5NH 1.4A 80 MOHM SMD	8000
0402HP-9N0EGTS Delta Electronics	FIXED IND 9NH 1.4A 80 MOHM SMD	7457
HTEX25201B-4R7MSR Delta Electronics	FIXED IND 4.7UH 1.7A 210MOHM SMD	3970
0402HS-430EKTS Delta Electronics	FIXED IND 43NH 100MA 810MOHM SMD	8000
0402HP-130EKTS Delta Electronics	FIXED IND 13NH 870MA 140MOHM SMD	8000
0805CS-2N8EJTS Delta Electronics	FIXED IND 2.8NH 800MA 60 MOHM	3875
0402HS-200EGTS Delta Electronics	FIXED IND 20NH 420MA 250 MOHM	7980
SDEM20161T-R24MS Delta Electronics	FIXED IND 240NH 5A 24MOHM SMD	4790
0805CS-180EGTS Delta Electronics	FIXED IND 18NH 600MA 200 MOHM	3846
0402HP-190EGTS Delta Electronics	FIXED IND 19NH 850MA 145 MOHM	7980

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