Fixed Inductors

Part Number	Description / PDF	Quantity
0402HM-6N2ECTS Delta Electronics	FIXED IND 6.2NH 700MA 90MOHM SMD	7995
0805CS-222EJTS Delta Electronics	FIXED IND 2.2UH 160MA 2.7 OHM	2305
0402HM-510EJTS Delta Electronics	FIXED IND 51NH 210MA 1.08 OHM	8000
0402HP-8N7EHTS Delta Electronics	FIXED IND 8.7NH 1.5A 58 MOHM SMD	43952
0805CT-120EJTS Delta Electronics	FIXED IND 12NH 800MA 100MOHM SMD	3970
0805CS-2N7EJTS Delta Electronics	FIXED IND 2.7NH 800MA 60 MOHM	3696
0805CS-121EKTS Delta Electronics	FIXED IND 120NH 400MA 510 MOHM	3750
0805CS-472EGTS Delta Electronics	FIXED IND 4.7UH 90MA 6.4 OHM SMD	3315
0402HM-3N0ECTS Delta Electronics	FIXED IND 3NH 750MA 70 MOHM SMD	7690
0402HM-180EJTS Delta Electronics	FIXED IND 18NH 370MA 270 MOHM	7650
0402HP-8N7EKTS Delta Electronics	FIXED IND 8.7NH 1.5A 58 MOHM SMD	8000
0402HM-300EKTS Delta Electronics	FIXED IND 30NH 270MA 580MOHM SMD	7990
0402HS-4N3EGTS Delta Electronics	FIXED IND 4.3NH 700MA 91 MOHM	8000
SDET25201T-1R0MS Delta Electronics	FIXED IND 1UH 1.98A 81MOHM SMD	5900
0402HS-230EGTS Delta Electronics	FIXED IND 23NH 400MA 300MOHM SMD	8000
0805CS-680EJTS Delta Electronics	FIXED IND 68NH 500MA 380 MOHM	3887
SDEM25201T-1R0MS Delta Electronics	FIXED IND 1UH 3.3A 62MOHM SMD	2005
0402HS-8N7EKTS Delta Electronics	FIXED IND 8.7NH 480MA 200 MOHM	8000
0402HP-120EHTS Delta Electronics	FIXED IND 12NH 1.2A 90 MOHM SMD	7973
0402HP-7N5EJTS Delta Electronics	FIXED IND 7.5NH 1.4A 80 MOHM SMD	7880

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