Fixed Inductors

Image	Part Number	Description / PDF	Quantity	Rfq
	CIL21S270KNE Samsung Electro-Mechanics	FIXED IND 27UH 5MA 1.15OHM SMD	0
	CIL21NR56KNE Samsung Electro-Mechanics	FIXED IND 560NH 150MA 500 MOHM	0
	CIL21NR27KNE Samsung Electro-Mechanics	FIXED IND 270NH 250MA 300 MOHM	0
	CIL21J1R8KNE Samsung Electro-Mechanics	FIXED IND 1.8UH 50MA 400MOHM SMD	0
	CIL31Y100KNE Samsung Electro-Mechanics	FIXED IND 10UH 25MA 1OHM SMD	0
	CIL21S150KNE Samsung Electro-Mechanics	FIXED IND 15UH 5MA 800MOHM SMD	0
	CIL21NR68KNE Samsung Electro-Mechanics	FIXED IND 680NH 150MA 500 MOHM	0
	CIL21S330KNE Samsung Electro-Mechanics	FIXED IND 33UH 5MA 1.25OHM SMD	0
	CIL21J2R2KNE Samsung Electro-Mechanics	FIXED IND 2.2UH 30MA 500MOHM SMD	0
	CIL21J2R7KNE Samsung Electro-Mechanics	FIXED IND 2.7UH 30MA 600MOHM SMD	0
	CIL21J3R9KNE Samsung Electro-Mechanics	FIXED IND 3.9UH 30MA 800MOHM SMD	0
	CIL21Y100KNE Samsung Electro-Mechanics	FIXED IND 10UH 15MA 800MOHM SMD	0
	CIL21N68NMNE Samsung Electro-Mechanics	FIXED IND 68NH 300MA 200MOHM SMD	0
	CIL21J1R2KNE Samsung Electro-Mechanics	FIXED IND 1.2UH 50MA 400MOHM SMD	0
	CIL21NR33KNE Samsung Electro-Mechanics	FIXED IND 330NH 250MA 300 MOHM	0
	CIL21NR47KNE Samsung Electro-Mechanics	FIXED IND 470NH 150MA 400 MOHM	0
	CIL21Y120KNE Samsung Electro-Mechanics	FIXED IND 12UH 15MA 900MOHM SMD	0
	CIL21NR22KNE Samsung Electro-Mechanics	FIXED IND 220NH 250MA 300 MOHM	0
	CIL21NR18KNC Samsung Electro-Mechanics	FIXED IND 180NH 250MA 250 MOHM	0
	CIL21J1R0KNE Samsung Electro-Mechanics	FIXED IND 1UH 50MA 300MOHM SMD	0

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