Fixed Inductors

Part Number	Description / PDF	Quantity
0402HP-250EHTS Delta Electronics	FIXED IND 25NH 600MA 250MOHM SMD	7960
0402HS-130EJTS Delta Electronics	FIXED IND 13NH 440MA 210 MOHM	8000
0402HP-3N6EJTS Delta Electronics	FIXED IND 3.6NH 1.7A 45 MOHM SMD	7323
0402HP-100EGTS Delta Electronics	FIXED IND 10NH 1.3A 85 MOHM SMD	5627
0402HP-2N0EJTS Delta Electronics	FIXED IND 2NH 2.1A 38 MOHM SMD	9499
0805CS-330EKTS Delta Electronics	FIXED IND 33NH 500MA 270 MOHM	3838
0805CS-122EKFS Delta Electronics	FIXED IND 1.2UH 400MA 900 MOHM	3705
0402HS-230EKTS Delta Electronics	FIXED IND 23NH 400MA 300MOHM SMD	8000
0402HS-400EKTS Delta Electronics	FIXED IND 40NH 320MA 500MOHM SMD	8000
0402HP-210EKTS Delta Electronics	FIXED IND 21NH 450MA 46 MOHM SMD	8000
0402HM-101EGTS Delta Electronics	FIXED IND 100NH 120MA 2.52 OHM	3555
0402HP-3N3EDTS Delta Electronics	FIXED IND 3.3NH 1.7A 45 MOHM SMD	7986
0402HM-390EKTS Delta Electronics	FIXED IND 39NH 250MA 700MOHM SMD	7930
0402HM-270EKTS Delta Electronics	FIXED IND 27NH 280MA 520MOHM SMD	7900
0805CS-361EKTS Delta Electronics	FIXED IND 360NH 300MA 1.45 OHM	3933
0402HP-5N6EHTS Delta Electronics	FIXED IND 5.6NH 1.6A 48 MOHM SMD	3703
0402HS-2N0EKTS Delta Electronics	FIXED IND 2NH 1.04A 70 MOHM SMD	7990
SDET25201B-R47MS Delta Electronics	FIXED IND 470NH 3.7A 28.5MOHM SM	3535
0402HM-390EJTS Delta Electronics	FIXED IND 39NH 250MA 700 MOHM	7790
0805CS-391EJFS Delta Electronics	FIXED IND 390NH 600MA 350 MOHM	3910

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