Fixed Inductors

Part Number	Description / PDF	Quantity
0402HM-3N9ECTS Delta Electronics	FIXED IND 3.9NH 750MA 70MOHM SMD	7975
0805CT-121EKTS Delta Electronics	FIXED IND 120NH 300MA 680 MOHM	3863
0402HS-100EGTS Delta Electronics	FIXED IND 10NH 480MA 195 MOHM	7415
0402HS-120EGTS Delta Electronics	FIXED IND 12NH 640MA 120 MOHM	5662
0805CS-3N3EKTS Delta Electronics	FIXED IND 3.3NH 600MA 80 MOHM	3090
0402HM-4N3EDTS Delta Electronics	FIXED IND 4.3NH 750MA 70MOHM SMD	7990
0805CS-241EJTS Delta Electronics	FIXED IND 240NH 350MA 1 OHM SMD	3967
0805CS-361EJTS Delta Electronics	FIXED IND 360NH 300MA 1.45 OHM	3990
0805CT-101EJTS Delta Electronics	FIXED IND 100NH 400MA 640 MOHM	3265
0805CS-332EGTS Delta Electronics	FIXED IND 3.3UH 90MA 4.4 OHM SMD	3937
HMLE20160H-1R0MDR Delta Electronics	FIXED INDUCTOR 1UH	4000
0805CT-820EKTS Delta Electronics	FIXED IND 82NH 500MA 440MOHM SMD	3990
0402HM-120EHTS Delta Electronics	FIXED IND 12NH 500MA 140MOHM SMD	7980
0805CS-6N2EJTS Delta Electronics	FIXED IND 6.2NH 600MA 110 MOHM	3957
VCHA042A-2R2MS6 Delta Electronics	FIXED IND 2.2UH 5.8A 23MOHM SMD	0
0805CS-360EKTS Delta Electronics	FIXED IND 36NH 500MA 270 MOHM	3996
0805CS-361EGTS Delta Electronics	FIXED IND 360NH 300MA 1.45 OHM	2151
0402HS-820EKTS Delta Electronics	FIXED IND 82NH 50MA 1.55 OHM SMD	8000
0805CS-150EGTS Delta Electronics	FIXED IND 15NH 600MA 170 MOHM	1963
0402HP-300EKTS Delta Electronics	FIXED IND 30NH 450MA 330MOHM SMD	7380

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