Fixed Inductors

Part Number	Description / PDF	Quantity
0402HS-2N2EKTS Delta Electronics	FIXED IND 2.2NH 960MA 70 MOHM	7984
0805CS-272EKFS Delta Electronics	FIXED IND 2.7UH 320MA 1.2OHM SMD	3988
CML0306-1N5-SNH Delta Electronics	FIXED IND 1.5NH 650MA 160 MOHM	0
0402HP-2N7EJTS Delta Electronics	FIXED IND 2.7NH 1.5A 56 MOHM SMD	7737
0402HS-3N9EJTS Delta Electronics	FIXED IND 3.9NH 840MA 66 MOHM	7037
0805CS-720EKTS Delta Electronics	FIXED IND 72NH 500MA 400 MOHM	3980
0402HM-4N1EKTS Delta Electronics	FIXED IND 4.1NH 750MA 70MOHM SMD	8000
0402HS-9N5EKTS Delta Electronics	FIXED IND 9.5NH 480MA 200 MOHM	8000
0805CS-430EJTS Delta Electronics	FIXED IND 43NH 500MA 340 MOHM	3830
0402HS-240EKTS Delta Electronics	FIXED IND 24NH 400MA 300MOHM SMD	7992
0805CS-221EJTS Delta Electronics	FIXED IND 220NH 400MA 700 MOHM	1520
0805CS-271EJTS Delta Electronics	FIXED IND 270NH 350MA 1 OHM SMD	3915
0402HP-200EGTS Delta Electronics	FIXED IND 20NH 780MA 185 MOHM	7813
0402HP-3N3EKTS Delta Electronics	FIXED IND 3.3NH 1.7A 45 MOHM SMD	7865
0805CS-121EKFS Delta Electronics	FIXED IND 120NH 1.1A 180MOHM SMD	4000
0805CS-470EKTS Delta Electronics	FIXED IND 47NH 500MA 310 MOHM	3982
0805CS-391EKTS Delta Electronics	FIXED IND 390NH 290MA 1.5 OHM	3740
0805CS-560EKTS Delta Electronics	FIXED IND 56NH 500MA 340 MOHM	3960
0805CS-822EJFS Delta Electronics	FIXED IND 8.2UH 180MA 3.3OHM SMD	2860
0402HM-430EKTS Delta Electronics	FIXED IND 43NH 250MA 700MOHM SMD	7975

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