Fixed Inductors

Part Number	Description / PDF	Quantity
0402HP-240EJTS Delta Electronics	FIXED IND 24NH 700MA 190 MOHM	7890
0402HM-2N7EDTS Delta Electronics	FIXED IND 2.7NH 850MA 50MOHM SMD	7980
0402HS-300EGTS Delta Electronics	FIXED IND 30NH 400MA 350MOHM SMD	7945
0805CT-560EGTS Delta Electronics	FIXED IND 56NH 500MA 390 MOHM	3489
0402HP-200EKTS Delta Electronics	FIXED IND 20NH 780MA 185MOHM SMD	7964
SDET25201T-2R2MS Delta Electronics	FIXED IND 2.2UH 1.5A 162MOHM SMD	4638
0402HS-9N5EJTS Delta Electronics	FIXED IND 9.5NH 480MA 200 MOHM	7985
0402HM-9N5EHTS Delta Electronics	FIXED IND 9.5NH 540MA 140 MOHM	7854
0402HP-130EGTS Delta Electronics	FIXED IND 13NH 870MA 140 MOHM	0
0402HM-4N3ECTS Delta Electronics	FIXED IND 4.3NH 750MA 70MOHM SMD	8000
0805CS-3N0EJTS Delta Electronics	FIXED IND 3NH 800MA 60 MOHM SMD	3669
0805CS-621EJTS Delta Electronics	FIXED IND 620NH 210MA 2.2 OHM	1928
0805CS-751EGTS Delta Electronics	FIXED IND 750NH 180MA 2.3OHM SMD	3518
SDEM20161T-3R3MS Delta Electronics	FIXED IND 3.3UH 1.2A 306MOHM SMD	3274
0402HS-470EGTS Delta Electronics	FIXED IND 47NH 150MA 830 MOHM	7575
0402HM-8N7EHTS Delta Electronics	FIXED IND 8.7NH 540MA 140 MOHM	11900
0805CT-3N9EJTS Delta Electronics	FIXED IND 3.9NH 800MA 60 MOHM	3699
0805CS-821EJFS Delta Electronics	FIXED IND 820NH 500MA 550 MOHM	3717
0402HP-330EJTS Delta Electronics	FIXED IND 33NH 490MA 330MOHM SMD	7698
0805CS-111EKTS Delta Electronics	FIXED IND 110NH 400MA 480 MOHM	3890

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