Fixed Inductors

Part Number	Description / PDF	Quantity
0402HM-390EGTS Delta Electronics	FIXED IND 39NH 250MA 700 MOHM	7796
0402HM-470EGTS Delta Electronics	FIXED IND 47NH 210MA 1.08 OHM	1554
0402HM-8N7ECTS Delta Electronics	FIXED IND 8.7NH 540MA 140 MOHM	7960
0402HM-3N9EDTS Delta Electronics	FIXED IND 3.9NH 750MA 70MOHM SMD	7945
0402HM-820EKTS Delta Electronics	FIXED IND 82NH 130MA 2.24OHM SMD	7860
0805CS-181EKFS Delta Electronics	FIXED IND 180NH 800MA 200 MOHM	3500
0805CT-101EGTS Delta Electronics	FIXED IND 100NH 400MA 640 MOHM	0
0805CS-331EGTS Delta Electronics	FIXED IND 330NH 310MA 1.4 OHM	0
0402HS-4N3EKTS Delta Electronics	FIXED IND 4.3NH 700MA 91MOHM SMD	7990
HMLE32251B-1R0MS Delta Electronics	FIXED IND 1UH 3.9A 41MOHM SMD	3945
SDET25201T-100MS Delta Electronics	FIXED IND 10UH 800MA 609MOHM SMD	1998
0805CS-390EJTS Delta Electronics	FIXED IND 39NH 500MA 290 MOHM	3634
VCMT136E-100MN5 Delta Electronics	FIXED IND 10UH 11A 17.2MOHM SMD	500
0402HP-2N0EDTS Delta Electronics	FIXED IND 2NH 2.1A 38 MOHM SMD	3960
HTEN20161T-1R0MDR Delta Electronics	FIXED IND 1UH SMD	4890
CML0306-6N8-HNH Delta Electronics	FIXED IND 6.8NH 230MA 700 MOHM	0
0805CT-102EKTS Delta Electronics	FIXED IND 1UH 170MA 3.5 OHM SMD	3970
0402HP-130EJTS Delta Electronics	FIXED IND 13NH 870MA 140 MOHM	7849
0805CS-390EGTS Delta Electronics	FIXED IND 39NH 500MA 290 MOHM	425
CMLE063T-R15MS0R907 Delta Electronics	FIXED IND 150NH 38A 0.9MOHM SMD	2233

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