Fixed Inductors

Part Number	Description / PDF	Quantity
0402HM-121EJTS Delta Electronics	FIXED IND 120NH 110MA 2.66 OHM	4995
HTEB16080F-1R0MSR Delta Electronics	FIXED IND 1UH 1A 318MOHM SMD	7191
0402HP-3N3EHTS Delta Electronics	FIXED IND 3.3NH 1.7A 45 MOHM SMD	7447
0402HC-4N7EDTS Delta Electronics	FIXED IND 4.7NH 800MA 51 MOHM	7730
VCHA105D-150MS6 Delta Electronics	FIXED IND 15UH 7.6A 31.3MOHM SMD	763
VCMT104T-100MN5 Delta Electronics	FIXED IND 10UH 6A 33MOHM SMD	860
0402HM-560EJTS Delta Electronics	FIXED IND 56NH 200MA 1.17 OHM	6575
0805CS-221EJFS Delta Electronics	FIXED IND 220NH 700MA 250 MOHM	3717
0402HP-120EGTS Delta Electronics	FIXED IND 12NH 1.2A 90 MOHM SMD	2618
0805CS-272EJFS Delta Electronics	FIXED IND 2.7UH 320MA 1.2OHM SMD	3845
0402HS-6N8EKTS Delta Electronics	FIXED IND 6.8NH 680MA 83MOHM SMD	7900
0402HM-1N5EBTS Delta Electronics	FIXED IND 1.5NH 1A 30 MOHM SMD	7543
0805CS-180EKTS Delta Electronics	FIXED IND 18NH 600MA 200 MOHM	3990
CML0306-2N4-SNH Delta Electronics	FIXED IND 2.4NH 500MA 200 MOHM	0
CML0306-3N6-SNH Delta Electronics	FIXED IND 3.6NH 400MA 320 MOHM	0
0402HS-180EKTS Delta Electronics	FIXED IND 18NH 420MA 230MOHM SMD	7964
CMLE063T-4R7MS Delta Electronics	FIXED IND 4.7UH 6.7A 26MOHM SMD	250
0402HP-3N6EHTS Delta Electronics	FIXED IND 3.6NH 1.7A 45 MOHM SMD	2490
0402HM-2N9EJTS Delta Electronics	FIXED IND 2.9NH 750MA 70 MOHM	7640
0402HC-5N6ECTS Delta Electronics	FIXED IND 5.6NH 800MA 51 MOHM	3797

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