Fixed Inductors

Part Number	Description / PDF	Quantity
0402HS-470EJTS Delta Electronics	FIXED IND 47NH 150MA 830 MOHM	7751
0402HPH-560EGTS Delta Electronics	FIXED IND 56NH 330MA 900MOHM SMD	7677
HTEK20161T-R47MSR Delta Electronics	FIXED IND 470NH 5.4A 22MOHM SMD	3043
HMLQ32251B-R47MS Delta Electronics	FIXED IND 470NH 5.8A 22OHM SMD	3650
0402HP-360EHTS Delta Electronics	FIXED IND 36NH 480MA 360MOHM SMD	7540
0805CT-4N7EKTS Delta Electronics	FIXED IND 4.7NH 800MA 60MOHM SMD	3922
0402HM-190EGTS Delta Electronics	FIXED IND 19NH 370MA 270 MOHM	7785
0805CT-220EGTS Delta Electronics	FIXED IND 22NH 800MA 150MOHM SMD	3643
HMLQ25201B-R47MSR Delta Electronics	FIXED IND 470NH 4.7A 27MOHM SMD	3180
0402HS-400EJTS Delta Electronics	FIXED IND 40NH 320MA 500 MOHM	8000
0805CS-103EKFS Delta Electronics	FIXED IND 10UH 180MA 4.5 OHM SMD	3917
0402HM-7N3EKTS Delta Electronics	FIXED INDUCTOR 7.3NH 570MA SMD	8000
0402HS-121EJTS Delta Electronics	FIXED IND 120NH 50MA 2.66 OHM	7960
SDEM25201T-R24MS Delta Electronics	FIXED IND 240NH 4.6A 23MOHM SMD	4942
0805CT-680EKTS Delta Electronics	FIXED IND 68NH 500MA 400MOHM SMD	2920
0402HM-6N2EJTS Delta Electronics	FIXED IND 6.2NH 700MA 90 MOHM	7990
0805CS-271EKTS Delta Electronics	FIXED IND 270NH 350MA 1 OHM SMD	3966
0805CS-681EKFS Delta Electronics	FIXED IND 680NH 500MA 600 MOHM	4000
0402HP-160EHTS Delta Electronics	FIXED IND 16NH 850MA 130MOHM SMD	8000
0402HS-430EGTS Delta Electronics	FIXED IND 43NH 100MA 810MOHM SMD	8000

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