Fixed Inductors

Part Number	Description / PDF	Quantity
0805CT-151EKTS Delta Electronics	FIXED IND 150NH 300MA 800 MOHM	3973
0402HS-110EJTS Delta Electronics	FIXED IND 11NH 640MA 120 MOHM	8000
HTEK20161T-1R0MSR Delta Electronics	FIXED IND 1UH 4.5A 43MOHM SMD	4370
0402HP-370EJTS Delta Electronics	FIXED IND 37NH 470MA 480MOHM SMD	7900
VCMI105T-680MS5 Delta Electronics	FIXED IND 68UH 3.2A 211MOHM SMD	411
HTEH20161T-1R0MSR Delta Electronics	FIXED INDUCTOR 1UH	215
0402HP-9N5EGTS Delta Electronics	FIXED IND 9.5NH 1.4A 80 MOHM SMD	7937
0402HM-8N7EDTS Delta Electronics	FIXED IND 8.7NH 540MA 140 MOHM	7900
0402HP-110EJTS Delta Electronics	FIXED IND 11NH 1.4A 65 MOHM SMD	7780
SDEM25201T-2R2MS Delta Electronics	FIXED IND 2.2UH 2.15A 115MOHM SM	4925
VCHA075D-150MS6 Delta Electronics	FIXED IND 15UH 3.8A 66MOHM SMD	1052
0402HM-7N5EJTS Delta Electronics	FIXED IND 7.5NH 570MA 130 MOHM	7900
0402HM-220EJTS Delta Electronics	FIXED IND 22NH 310MA 300 MOHM	7910
HTEX20161T-4R7MDR Delta Electronics	FIXED IND 4.7UH 1.5A 250MOHM SMD	11386
0402HS-100EKTS Delta Electronics	FIXED IND 10NH 480MA 195MOHM SMD	7998
CML0306-9N1-HNH Delta Electronics	FIXED IND 9.1NH 180MA 1.2 OHM	0
0805CT-330EKTS Delta Electronics	FIXED IND 33NH 600MA 280MOHM SMD	3892
0402HP-8N2EGTS Delta Electronics	FIXED IND 8.2NH 1.5A 58 MOHM SMD	7012
0402HS-5N6EJTS Delta Electronics	FIXED IND 5.6NH 760MA 83 MOHM	5185
0402HC-3N6ECTS Delta Electronics	FIXED IND 3.6NH 900MA 40 MOHM	7845

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