Fixed Inductors

Part Number	Description / PDF	Quantity
0402HP-470EGTS Delta Electronics	FIXED IND 47NH 420MA 580 MOHM	5289
0402HP-250EKTS Delta Electronics	FIXED IND 25NH 600MA 250MOHM SMD	7990
0402HP-4N3EKTS Delta Electronics	FIXED IND 4.3NH 1.6A 45 MOHM SMD	7990
0402HM-620EKTS Delta Electronics	FIXED IND 62NH 145MA 1.82OHM SMD	7960
0402HS-8N2EJTS Delta Electronics	FIXED IND 8.2NH 680MA 104 MOHM	7490
0402HS-6N8EGTS Delta Electronics	FIXED IND 6.8NH 680MA 83 MOHM	7890
0402HP-300EJTS Delta Electronics	FIXED IND 30NH 450MA 330MOHM SMD	7895
0402HP-370EGTS Delta Electronics	FIXED IND 37NH 470MA 480 MOHM	7926
SDEB12101T-100MSD Delta Electronics	FIXED IND 10UH 360MA 1.5OHM SMD	2928
SDEM20161T-R47MS Delta Electronics	FIXED IND 470NH 3.4A 41MOHM SMD	4485
0402HM-2N4ECTS Delta Electronics	FIXED IND 2.4NH 850MA 50 MOHM	7700
0805CS-201EGTS Delta Electronics	FIXED IND 200NH 400MA 660 MOHM	1569
0402HP-120EKTS Delta Electronics	FIXED IND 12NH 1.2A 90 MOHM SMD	8000
0402HP-9N0EKTS Delta Electronics	FIXED IND 9NH 1.4A 80 MOHM SMD	7922
0805CS-152EKTS Delta Electronics	FIXED IND 1.5UH 170MA 2.5 OHM	3932
0805CS-6N2EKTS Delta Electronics	FIXED IND 6.2NH 600MA 110 MOHM	3807
HMLE20161T-1R0MDR Delta Electronics	FIXED IND 1UH 3.1A 65MOHM SMD	1990
0402HP-100EHTS Delta Electronics	FIXED IND 10NH 1.3A 85 MOHM SMD	7990
0402HS-150EGTS Delta Electronics	FIXED IND 15NH 560MA 172 MOHM	6385
0402HP-2N2EJTS Delta Electronics	FIXED IND 2.2NH 2.1A 38 MOHM SMD	6596

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