Fixed Inductors

Part Number	Description / PDF	Quantity
0402HM-1N5ECTS Delta Electronics	FIXED IND 1.5NH 1A 30 MOHM SMD	7950
0805CS-621EKTS Delta Electronics	FIXED IND 620NH 210MA 2.2 OHM	3670
0402HM-400EGTS Delta Electronics	FIXED IND 40NH 250MA 700 MOHM	7860
0805CS-681EKTS Delta Electronics	FIXED IND 680NH 190MA 2.2 OHM	3990
SDEM20161T-4R7MS Delta Electronics	FIXED IND 4.7UH 1.1A 426MOHM SMD	6519
0805CT-153EJFS Delta Electronics	FIXED IND 15UH 300MA 5 OHM SMD	3751
0402HP-230EKTS Delta Electronics	FIXED IND 23NH 800MA 160MOHM SMD	8000
0402HS-1N0EKTS Delta Electronics	FIXED IND 1NH 1.36A 45 MOHM SMD	29619
SDET32251E-4R7MS Delta Electronics	FIXED IND 4.7UH 1.9A 108MOHM SMD	10102
0402HS-150EJTS Delta Electronics	FIXED IND 15NH 560MA 172 MOHM	7986
0402HP-6N2EKTS Delta Electronics	FIXED IND 6.2NH 1.6A 50 MOHM SMD	8000
CMLE063T-R15MS0R987 Delta Electronics	FIXED IND 150NH 35A 0.98MOHM SMD	1904
0402HM-2N5EBTS Delta Electronics	FIXED IND 2.5NH 850MA 50MOHM SMD	7915
0402HP-360EJTS Delta Electronics	FIXED IND 36NH 480MA 360MOHM SMD	9512
0402HP-9N5EKTS Delta Electronics	FIXED IND 9.5NH 1.4A 80 MOHM SMD	8000
0402HS-2N4EJTS Delta Electronics	FIXED IND 2.4NH 790MA 70 MOHM	11351
0805CT-820EJTS Delta Electronics	FIXED IND 82NH 500MA 440MOHM SMD	3880
SDET25200H-2R2MS Delta Electronics	FIXED IND 2.2UH 1.36A 199MOHM SM	4820
0402HS-510EJTS Delta Electronics	FIXED IND 51NH 100MA 820 MOHM	7985
0402HP-4N3EJTS Delta Electronics	FIXED IND 4.3NH 1.6A 45 MOHM SMD	7860

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