Fixed Inductors

Part Number	Description / PDF	Quantity
VCMT053T-1R5MN5 Delta Electronics	FIXED IND 1.5UH 8.2A 17.7 MOHM	1810
0402HM-680EJTS Delta Electronics	FIXED IND 68NH 140MA 1.96 OHM	7990
CMLE063T-1R5MS Delta Electronics	FIXED IND 1.5UH 12A 8.9MOHM SMD	2043
0402HS-5N1EJTS Delta Electronics	FIXED IND 5.1NH 800MA 83 MOHM	7995
0402HP-240EKTS Delta Electronics	FIXED IND 24NH 700MA 190MOHM SMD	7974
0805CS-6N8EKTS Delta Electronics	FIXED IND 6.8NH 600MA 110 MOHM	3950
0402HS-160EJTS Delta Electronics	FIXED IND 16NH 560MA 220 MOHM	8000
CMLE063T-6R8MS Delta Electronics	FIXED IND 6.8UH 5.5A 28MOHM SMD	2802
0805CS-102EKTS Delta Electronics	FIXED IND 1UH 170MA 2.5 OHM SMD	3998
0805CS-7N5EKTS Delta Electronics	FIXED IND 7.5NH 600MA 140 MOHM	3846
0805CT-100EJTS Delta Electronics	FIXED IND 10NH 800MA 80 MOHM SMD	5892
HMLQ20160H-1R0MDR Delta Electronics	FIXED IND 1UH 2.7A 96MOHM SMD	2990
0402HP-2N7ECTS Delta Electronics	FIXED IND 2.7NH 1.5A 56 MOHM SMD	2810
SDEM20161T-R68MS Delta Electronics	FIXED IND 680NH 3.2A 55MOHM SMD	4900
0805CS-152EKFS Delta Electronics	FIXED IND 1.5UH 350MA 1.05 OHM	3988
0402HS-720EKTS Delta Electronics	FIXED IND 72NH 100MA 1.12OHM SMD	8000
0805CS-220EJTS Delta Electronics	FIXED IND 22NH 500MA 220 MOHM	3936
0805CT-102EGTS Delta Electronics	FIXED IND 1UH 170MA 3.5 OHM SMD	1797
0805CS-682EKFS Delta Electronics	FIXED IND 6.8UH 200MA 2.7OHM SMD	3976
HMLB25201T-1R0MSR Delta Electronics	FIXED IND 1UH 3.4A 55MOHM SMD	11775

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