Fixed Inductors

Part Number	Description / PDF	Quantity
0402HS-360EJTS Delta Electronics	FIXED IND 36NH 320MA 440 MOHM	7950
0805CT-680EGTS Delta Electronics	FIXED IND 68NH 500MA 400 MOHM	3821
0402HM-1N5EDTS Delta Electronics	FIXED IND 1.5NH 1A 30 MOHM SMD	6995
0402HS-680EKTS Delta Electronics	FIXED IND 68NH 100MA 1.12OHM SMD	7950
0402HP-8N7EJTS Delta Electronics	FIXED IND 8.7NH 1.5A 58 MOHM SMD	7870
0805CS-472EKFS Delta Electronics	FIXED IND 4.7UH 200MA 2.1OHM SMD	3878
VCHA075D-100MS6 Delta Electronics	FIXED IND 10UH 5.2A 38MOHM SMD	5000
0402HS-220EJTS Delta Electronics	FIXED IND 22NH 400MA 300 MOHM	7997
VCMT063T-6R8MN5T Delta Electronics	FIXED IND 6.8UH 5.5A 46.8 MOHM	1275
0402HM-4N7EDTS Delta Electronics	FIXED IND 4.7NH 750MA 70MOHM SMD	0
0805CS-102EJFS Delta Electronics	FIXED IND 1UH 450MA 80 MOHM SMD	5765
0402HM-4N1ECTS Delta Electronics	FIXED IND 4.1NH 750MA 70MOHM SMD	7990
HMLQ32251B-2R2MS Delta Electronics	FIXED IND 2.2UH 3.2A 85MOHM SMD	12240
0402HM-3N0EJTS Delta Electronics	FIXED IND 3NH 750MA 70 MOHM SMD	7720
0402HM-620EJTS Delta Electronics	FIXED IND 62NH 145MA 1.82 OHM	8000
VCMT063T-220MN5T Delta Electronics	FIXED IND 22UH 2.5A 174MOHM SMD	1217
SDET25200H-100MS Delta Electronics	FIXED IND 10UH 600MA 1.02OHM SMD	4750
0402HM-150EKTS Delta Electronics	FIXED IND 15NH 460MA 160MOHM SMD	104
0402HS-560EKTS Delta Electronics	FIXED IND 56NH 100MA 970MOHM SMD	8000
0402HS-300EJTS Delta Electronics	FIXED IND 30NH 400MA 350MOHM SMD	7975

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