Fixed Inductors

Part Number	Description / PDF	Quantity
0805CS-272EJTS Delta Electronics	FIXED IND 2.7UH 150MA 3.1 OHM	3800
0402HM-7N0EJTS Delta Electronics	FIXED IND 7NH 570MA 130 MOHM SMD	7990
0805CS-332EKTS Delta Electronics	FIXED IND 3.3UH 90MA 4.4 OHM SMD	3623
VCMT063T-4R7MN5T Delta Electronics	FIXED IND 4.7UH 6A 33.4MOHM SMD	4480
SDET25201B-100MS Delta Electronics	FIXED IND 10UH 900MA 408MOHM SMD	9586
0402HS-2N2EJTS Delta Electronics	FIXED IND 2.2NH 960MA 70 MOHM	4000
VCHA042A-4R7MS6 Delta Electronics	FIXED IND 4.7UH 4A 53.8MOHM SMD	9868
0402HP-2N4EJTS Delta Electronics	FIXED IND 2.4NH 2A 42 MOHM SMD	8000
HMLQ32251B-4R7MS Delta Electronics	FIXED IND 4.7UH 1.7A 195OHM SMD	5915
0402HC-5N1EDTS Delta Electronics	FIXED IND 5.1NH 800MA 51 MOHM	7990
0402HP-180EKTS Delta Electronics	FIXED IND 18NH 900MA 120MOHM SMD	7828
0402HM-360EKTS Delta Electronics	FIXED IND 36NH 260MA 630MOHM SMD	8000
0402HP-370EKTS Delta Electronics	FIXED IND 37NH 470MA 480MOHM SMD	8000
0805CS-332EKFS Delta Electronics	FIXED IND 3.3UH 300MA 1.5OHM SMD	3950
0805CS-560EGTS Delta Electronics	FIXED IND 56NH 500MA 340 MOHM	2010
0402HP-510EKTS Delta Electronics	FIXED IND 51NH 360MA 700MOHM SMD	8000
0402HM-360EJTS Delta Electronics	FIXED IND 36NH 260MA 630 MOHM	7900
0805CS-222EKFS Delta Electronics	FIXED IND 2.2UH 320MA 1.1OHM SMD	3928
0402HP-4N7EJTS Delta Electronics	FIXED IND 4.7NH 1.5A 60 MOHM SMD	7610
0402HM-7N0EGTS Delta Electronics	FIXED IND 7NH 570MA 130 MOHM SMD	7727

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