Fixed Inductors

Part Number	Description / PDF	Quantity
0402HM-510EKTS Delta Electronics	FIXED IND 51NH 210MA 1.08OHM SMD	7980
0805CS-2N8EKTS Delta Electronics	FIXED IND 2.8NH 800MA 60 MOHM	4000
0402HM-6N2EKTS Delta Electronics	FIXED IND 6.2NH 700MA 90MOHM SMD	8000
0805CS-430EGTS Delta Electronics	FIXED IND 43NH 500MA 340 MOHM	3843
0402HP-5N1EJTS Delta Electronics	FIXED IND 5.1NH 1.2A 100MOHM SMD	7870
0805CS-560EJTS Delta Electronics	FIXED IND 56NH 500MA 340 MOHM	3975
0402HM-2N5EDTS Delta Electronics	FIXED IND 2.5NH 850MA 50MOHM SMD	7970
0805CS-221EGTS Delta Electronics	FIXED IND 220NH 400MA 700 MOHM	2233
0402HP-330EKTS Delta Electronics	FIXED IND 33NH 490MA 330MOHM SMD	7940
0805CS-251EKTS Delta Electronics	FIXED IND 250NH 350MA 1 OHM SMD	1980
0805CS-101EJTS Delta Electronics	FIXED IND 100NH 400MA 46 MOHM	12656
0402HS-240EGTS Delta Electronics	FIXED IND 24NH 400MA 300MOHM SMD	7988
0402HP-220EKTS Delta Electronics	FIXED IND 22NH 800MA 160MOHM SMD	7990
SDET25201B-2R2MS Delta Electronics	FIXED IND 2.2UH 1.9A 90MOHM SMD	5537
0402HM-120EJTS Delta Electronics	FIXED IND 12NH 500MA 140 MOHM	3990
0402HS-2N4EKTS Delta Electronics	FIXED IND 2.4NH 790MA 70MOHM SMD	7990
CMLE063T-8R2MS Delta Electronics	FIXED IND 8.2UH 5.1A 60MOHM SMD	2000
0402HS-190EKTS Delta Electronics	FIXED IND 19NH 480MA 202 MOHM	8000
0805CS-182EJFS Delta Electronics	FIXED IND 1.8UH 350MA 900 MOHM	3525
0805CS-391EKFS Delta Electronics	FIXED IND 390NH 600MA 350 MOHM	3998

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