Fixed Inductors

Part Number	Description / PDF	Quantity
0805CT-560EJTS Delta Electronics	FIXED IND 56NH 500MA 390 MOHM	3980
0805CS-8N2EJTS Delta Electronics	FIXED IND 8.2NH 600MA 120 MOHM	3897
0805CS-241EKTS Delta Electronics	FIXED IND 240NH 350MA 1 OHM SMD	3980
0805CS-101EKTS Delta Electronics	FIXED IND 100NH 400MA 46 MOHM	5688
0402HP-120EJTS Delta Electronics	FIXED IND 12NH 1.2A 90 MOHM SMD	7810
HMLQ32251B-1R0MS Delta Electronics	FIXED IND 1UH SMD	2370
0402HM-560EKTS Delta Electronics	FIXED IND 56NH 200MA 1.17OHM SMD	6645
SDEM25201T-R33MS Delta Electronics	FIXED IND 330NH 4.5A 29MOHM SMD	4000
0402HM-9N5EGTS Delta Electronics	FIXED IND 9.5NH 540MA 140 MOHM	7931
0402HM-6N8EDTS Delta Electronics	FIXED IND 6.8NH 700MA 90MOHM SMD	7970
0402HM-8N7EGTS Delta Electronics	FIXED IND 8.7NH 540MA 140 MOHM	7885
0402HP-4N7EHTS Delta Electronics	FIXED IND 4.7NH 1.5A 60 MOHM SMD	7960
VCHA042A-100MS6 Delta Electronics	FIXED IND 10UH 2.5A 129MOHM SMD	0
SDEM25201B-3R3MS Delta Electronics	FIXED IND 3.3UH 1.65A 188MOHM SM	2075
0402HM-180EGTS Delta Electronics	FIXED IND 18NH 370MA 270 MOHM	3840
0805CT-470EGTS Delta Electronics	FIXED IND 47NH 600MA 390 MOHM	3950
0402HS-2N7EJTS Delta Electronics	FIXED IND 2.7NH 640MA 120 MOHM	7635
SDEB12101T-1R5MSD Delta Electronics	FIXED IND 1.5UH 900MA 276MOHM SM	3995
0402HM-4N7EBTS Delta Electronics	FIXED IND 4.7NH 750MA 70 MOHM	8000
0402HS-2N0EJTS Delta Electronics	FIXED IND 2NH 1.04A 70 MOHM SMD	7300

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