Fixed Inductors

Part Number	Description / PDF	Quantity
0402HM-7N5EGTS Delta Electronics	FIXED IND 7.5NH 570MA 130 MOHM	7588
0805CT-820EGTS Delta Electronics	FIXED IND 82NH 500MA 440MOHM SMD	1423
0402HP-2N7EKTS Delta Electronics	FIXED IND 2.7NH 1.5A 56 MOHM SMD	7990
CML0306-18N-HNH Delta Electronics	FIXED IND 18NH 160MA 1.7 OHM SMD	0
SDEM20161T-100MS Delta Electronics	FIXED IND 10UH 700MA 1.01OHM SMD	3675
0805CS-151EJTS Delta Electronics	FIXED IND 150NH 400MA 560 MOHM	3983
0402HM-5N1EDTS Delta Electronics	FIXED IND 5.1NH 600MA 120 MOHM	7950
0805CS-910EGTS Delta Electronics	FIXED IND 91NH 400MA 480 MOHM	3686
0805CS-682EJFS Delta Electronics	FIXED IND 6.8UH 200MA 2.7OHM SMD	3980
0805CS-471EKFS Delta Electronics	FIXED IND 470NH 600MA 450 MOHM	3490
0402HP-3N9EKTS Delta Electronics	FIXED IND 3.9NH 1.7A 45 MOHM SMD	7955
0402HM-9N1EKTS Delta Electronics	FIXED IND 9.1NH 540MA 140 MOHM	8000
SDEM25201T-R47MS Delta Electronics	FIXED IND 470NH 4A 35MOHM SMD	6000
0402HC-4N7ECTS Delta Electronics	FIXED IND 4.7NH 800MA 51 MOHM	7615
0402HM-2N7EKTS Delta Electronics	FIXED IND 2.7NH 850MA 50MOHM SMD	7930
0805CS-122EKTS Delta Electronics	FIXED IND 1.2UH 170MA 2.5OHM SMD	3880
0402HM-330EJTS Delta Electronics	FIXED IND 33NH 260MA 630 MOHM	7970
SDEI054T-2R2MS Delta Electronics	FIXED IND 2.2UH 5.4A 17.5 MOHM	1144
0402HM-100EJTS Delta Electronics	FIXED IND 10NH 500MA 170 MOHM	7990
0402HPH-560EKTS Delta Electronics	FIXED IND 56NH 330MA 900MOHM SMD	7816

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