Fixed Inductors

Part Number	Description / PDF	Quantity
0402HP-260EJTS Delta Electronics	FIXED IND 26NH 450MA 275 MOHM	7890
0805CS-240EKTS Delta Electronics	FIXED IND 24NH 500MA 220 MOHM	3935
0402HM-130EHTS Delta Electronics	FIXED IND 13NH 430MA 210MOHM SMD	7940
0402HM-6N8EJTS Delta Electronics	FIXED IND 6.8NH 700MA 90 MOHM	7230
0402HS-1N2EKTS Delta Electronics	FIXED IND 1.2NH 740MA 90 MOHM	7767
0402HS-5N1EGTS Delta Electronics	FIXED IND 5.1NH 800MA 83 MOHM	7855
0402HP-3N6EKTS Delta Electronics	FIXED IND 3.6NH 1.7A 45 MOHM SMD	7800
0402HC-5N6EDTS Delta Electronics	FIXED IND 5.6NH 800MA 51 MOHM	7885
0402HS-9N0EKTS Delta Electronics	FIXED IND 9NH 680MA 104 MOHM SMD	7980
0402HM-2N4EBTS Delta Electronics	FIXED IND 2.4NH 850MA 50 MOHM	7673
0402HC-3N4ECTS Delta Electronics	FIXED IND 3.4NH 900MA 40 MOHM	7751
0402HP-230EGTS Delta Electronics	FIXED IND 23NH 800MA 160 MOHM	7900
SDED20161T-4R7MS Delta Electronics	FIXED IND 4.7UH 950MA 387MOHM SM	5401
SDET32251E-3R3MS Delta Electronics	FIXED IND 3.3UH 2.1A 102MOHM SMD	3767
0805CT-682EKFS Delta Electronics	FIXED IND 6.8UH 400MA 2.4OHM SMD	3978
0402HP-390EHTS Delta Electronics	FIXED IND 39NH 450MA 430MOHM SMD	7840
0402HM-9N1EGTS Delta Electronics	FIXED IND 9.1NH 540MA 140 MOHM	7675
0402HP-230EHTS Delta Electronics	FIXED IND 23NH 800MA 160MOHM SMD	7890
HMLE20161T-2R2MDR Delta Electronics	FIXED IND 2.2UH 2A 158MOHM SMD	4020
0402HP-400EGTS Delta Electronics	FIXED IND 40NH 450MA 430 MOHM	7385

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