Fixed Inductors

Part Number	Description / PDF	Quantity
CML0306-12N-JNH Delta Electronics	FIXED IND 12NH 180MA 1.3 OHM SMD	0
CML0306-5N6-JNH Delta Electronics	FIXED IND 5.6NH 260MA 550 MOHM	0
0402HM-100EKTS Delta Electronics	FIXED IND 10NH 500MA 170 MOHM	7947
0402HP-8N2EJTS Delta Electronics	FIXED IND 8.2NH 1.5A 58 MOHM SMD	7330
0402HS-240EJTS Delta Electronics	FIXED IND 24NH 400MA 300MOHM SMD	8000
0402HP-240EGTS Delta Electronics	FIXED IND 24NH 700MA 190 MOHM	7743
CMLE063T-3R3MS Delta Electronics	FIXED IND 3.3UH 8A 21MOHM SMD	1919
0805CS-150EKTS Delta Electronics	FIXED IND 15NH 600MA 170 MOHM	3810
0402HS-560EJTS Delta Electronics	FIXED IND 56NH 100MA 970 MOHM	7900
HMLQ25201B-1R0MSR Delta Electronics	FIXED IND 1UH 4A 41MOHM SMD	0
0805CS-240EGTS Delta Electronics	FIXED IND 24NH 500MA 220 MOHM	3633
0402HS-7N5EKTS Delta Electronics	FIXED IND 7.5NH 680MA 104 MOHM	7975
0805CS-331EJTS Delta Electronics	FIXED IND 330NH 310MA 1.4 OHM	2899
0805CT-121EGTS Delta Electronics	FIXED IND 120NH 300MA 680 MOHM	2875
0402HP-5N1EGTS Delta Electronics	FIXED IND 5.1NH 1.2A 100 MOHM	0
0805CS-2N7EKTS Delta Electronics	FIXED IND 2.7NH 800MA 60 MOHM	3966
HMLQ20121T-1R0MXR Delta Electronics	FIXED IND 1UH 1.8A 120MOHM SMD	4775
VCMT053T-150MN5 Delta Electronics	FIXED IND 15UH 2A 196MOHM SMD	4000
SDED20161T-2R2MS Delta Electronics	FIXED IND 2.2UH 1.35A 230MOHM SM	5728
CMLE063T-1R0MS Delta Electronics	FIXED IND 1UH 16A 6.5MOHM SMD	2870

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