Fixed Inductors

Part Number	Description / PDF	Quantity
VCMT104T-330MN5 Delta Electronics	FIXED IND 33UH 3.6A 102MOHM SMD	40
0402HS-8N2EKTS Delta Electronics	FIXED IND 8.2NH 680MA 104 MOHM	7964
0805CS-182EJTS Delta Electronics	FIXED IND 1.8UH 170MA 2.5 OHM	3740
0805CT-270EJTS Delta Electronics	FIXED IND 27NH 600MA 230 MOHM	3874
0402HM-230EGTS Delta Electronics	FIXED IND 23NH 310MA 300 MOHM	7940
0805CT-121EJTS Delta Electronics	FIXED IND 120NH 300MA 680 MOHM	3990
0805CT-560EKTS Delta Electronics	FIXED IND 56NH 500MA 390 MOHM	3990
0402HP-330EHTS Delta Electronics	FIXED IND 33NH 490MA 330MOHM SMD	7875
0402HS-220EGTS Delta Electronics	FIXED IND 22NH 400MA 300 MOHM	3460
0402HP-9N5EJTS Delta Electronics	FIXED IND 9.5NH 1.4A 80 MOHM SMD	7880
0402HM-4N3EKTS Delta Electronics	FIXED IND 4.3NH 750MA 70 MOHM	8000
0805CS-331EKFS Delta Electronics	FIXED IND 330NH 650MA 350 MOHM	3990
0805CS-360EGTS Delta Electronics	FIXED IND 36NH 500MA 270 MOHM	3962
0402HP-7N5EKTS Delta Electronics	FIXED IND 7.5NH 1.4A 80 MOHM SMD	8000
0402HC-5N1ECTS Delta Electronics	FIXED IND 5.1NH 800MA 51 MOHM	7837
CMLE063T-R24MS1R197 Delta Electronics	FIXED IND 240NH 35A 1.19MOHM SMD	985
0402HP-390EGTS Delta Electronics	FIXED IND 39NH 450MA 430 MOHM	7715
0402HM-110EHTS Delta Electronics	FIXED IND 11NH 500MA 140MOHM SMD	7990
0402HM-101EJTS Delta Electronics	FIXED IND 100NH 120MA 2.52 OHM	7570
0805CT-4N7EJTS Delta Electronics	FIXED IND 4.7NH 800MA 60MOHM SMD	3030

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