Fixed Inductors

Part Number	Description / PDF	Quantity
0402HS-180EJTS Delta Electronics	FIXED IND 18NH 420MA 230 MOHM	6400
0402HP-430EKTS Delta Electronics	FIXED IND 43NH 450MA 520MOHM SMD	8000
0805CS-301EKTS Delta Electronics	FIXED IND 300NH 330MA 1.2 OHM	3970
0402HP-160EJTS Delta Electronics	FIXED IND 16NH 850MA 130 MOHM	7900
0402HM-720EGTS Delta Electronics	FIXED IND 72NH 135MA 2.1 OHM SMD	7900
CMLE063T-R22MS Delta Electronics	FIXED IND 220NH 37A 1.3MOHM SMD	0
0805CT-103EJFS Delta Electronics	FIXED IND 10UH 400MA 2.7 OHM SMD	5845
0402HS-1N8EJTS Delta Electronics	FIXED IND 1.8NH 1.04A 70 MOHM	7044
0805CS-820EGTS Delta Electronics	FIXED IND 82NH 400MA 420 MOHM	3717
0805CT-330EGTS Delta Electronics	FIXED IND 33NH 600MA 280 MOHM	3985
0402HM-7N0EHTS Delta Electronics	FIXED IND 7NH 570MA 130 MOHM SMD	7980
0402HS-1N2EJTS Delta Electronics	FIXED IND 1.2NH 740MA 90 MOHM	11880
0402HM-4N7ECTS Delta Electronics	FIXED IND 4.7NH 750MA 70MOHM SMD	6600
0402HM-190EJTS Delta Electronics	FIXED IND 19NH 370MA 270MOHM SMD	7898
0805CT-470EKTS Delta Electronics	FIXED IND 47NH 600MA 390MOHM SMD	3990
0402HM-150EHTS Delta Electronics	FIXED IND 15NH 460MA 160MOHM SMD	7975
0402HM-200EGTS Delta Electronics	FIXED IND 20NH 370MA 270 MOHM	7583
0402HP-210EJTS Delta Electronics	FIXED IND 21NH 450MA 46 MOHM SMD	7872
0402HM-7N0ECTS Delta Electronics	FIXED IND 7NH 570MA 130 MOHM SMD	7900
0402HS-9N0EGTS Delta Electronics	FIXED IND 9NH 680MA 104 MOHM SMD	7810

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