Fixed Inductors

Part Number	Description / PDF	Quantity
0402HS-230EJTS Delta Electronics	FIXED IND 23NH 400MA 300 MOHM	8000
0805CS-240EJTS Delta Electronics	FIXED IND 24NH 500MA 220 MOHM	0
0402HS-8N7EJTS Delta Electronics	FIXED IND 8.7NH 480MA 200 MOHM	7995
0805CT-270EKTS Delta Electronics	FIXED IND 27NH 600MA 230MOHM SMD	3991
0402HM-7N3ECTS Delta Electronics	FIXED INDUCTOR 7.3NH 570MA SMD	7990
0805CT-153EKFS Delta Electronics	FIXED IND 15UH 300MA 5 OHM SMD	3960
HTEH20120H-1R0MSR Delta Electronics	FIXED IND 1UH 3.5A 55MOHM SMD	0
SDET25201T-3R3MS Delta Electronics	FIXED IND 3.3UH 1.2A 249MOHM SMD	3650
0402HP-4N3EHTS Delta Electronics	FIXED IND 4.3NH 1.6A 45 MOHM SMD	7935
0805CS-911EJTS Delta Electronics	FIXED IND 910NH 170MA 1.9 OHM	3908
VCHA042A-1R0MS6 Delta Electronics	FIXED IND 1UH 8.9A 10.5MOHM SMD	5975
0402HS-5N1EKTS Delta Electronics	FIXED IND 5.1NH 800MA 83MOHM SMD	7990
0402HS-100EJTS Delta Electronics	FIXED IND 10NH 480MA 195 MOHM	4330
CMLE063T-R36MS Delta Electronics	FIXED IND 360NH 25A 2.55MOHM SMD	4696
0402HS-2N2ECTS Delta Electronics	FIXED IND 2.2NH 960MA 70 MOHM	5400
0805CT-120EGTS Delta Electronics	FIXED IND 12NH 800MA 100MOHM SMD	3933
0402HP-5N6EJTS Delta Electronics	FIXED IND 5.6NH 1.6A 48 MOHM SMD	7875
0805CS-330EGTS Delta Electronics	FIXED IND 33NH 500MA 270 MOHM	3654
0402HP-5N1EHTS Delta Electronics	FIXED IND 5.1NH 1.2A 100MOHM SMD	7990
0805CT-682EJFS Delta Electronics	FIXED IND 6.8UH 400MA 2.4OHM SMD	3900

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