Fixed Inductors

Part Number	Description / PDF	Quantity
0402HM-2N9EDTS Delta Electronics	FIXED IND 2.9NH 750MA 70MOHM SMD	8000
0402HM-330EGTS Delta Electronics	FIXED IND 33NH 260MA 630 MOHM	7876
0805CT-100EGTS Delta Electronics	FIXED IND 10NH 800MA 80 MOHM SMD	0
0402HM-400EKTS Delta Electronics	FIXED IND 40NH 250MA 700MOHM SMD	7995
0402HP-150EHTS Delta Electronics	FIXED IND 15NH 1.1A 110 MOHM SMD	7980
0402HM-3N0EDTS Delta Electronics	FIXED IND 3NH 750MA 70 MOHM SMD	7975
0402HM-101EKTS Delta Electronics	FIXED IND 100NH 120MA 2.52 OHM	8000
0805CS-8N7EKTS Delta Electronics	FIXED IND 8.7NH 400MA 210 MOHM	3990
0402HM-240EJTS Delta Electronics	FIXED IND 24NH 280MA 520 MOHM	8000
VCHA075D-4R7MS6 Delta Electronics	FIXED IND 4.7UH 7A 20.9MOHM SMD	2903
0402HP-430EHTS Delta Electronics	FIXED IND 43NH 450MA 520MOHM SMD	7997
0402HS-6N2EGTS Delta Electronics	FIXED IND 6.2NH 760MA 83 MOHM	7970
0805CS-332EJTS Delta Electronics	FIXED IND 3.3UH 90MA 4.4 OHM SMD	3966
0805CS-392EJFS Delta Electronics	FIXED IND 3.9UH 300MA 1.6OHM SMD	3574
0805CS-301EGTS Delta Electronics	FIXED IND 300NH 330MA 1.2 OHM	2857
0402HM-7N5EHTS Delta Electronics	FIXED IND 7.5NH 570MA 130 MOHM	7990
0402HP-470EHTS Delta Electronics	FIXED IND 47NH 420MA 580MOHM SMD	7835
0805CS-181EJTS Delta Electronics	FIXED IND 180NH 400MA 640 MOHM	3920
0402HP-400EJTS Delta Electronics	FIXED IND 40NH 450MA 430MOHM SMD	7900
0805CT-102EJTS Delta Electronics	FIXED IND 1UH 170MA 3.5 OHM SMD	3735

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