Fixed Inductors

Image	Part Number	Description / PDF	Quantity	Rfq
	CIL21NR10KNE Samsung Electro-Mechanics	FIXED IND 100NH 250MA 200 MOHM	0
	CIL21NR15KNE Samsung Electro-Mechanics	FIXED IND 150NH 250MA 250 MOHM	0
	CIL21J1R5KNE Samsung Electro-Mechanics	FIXED IND 1.5UH 50MA 400MOHM SMD	0
	CIL31NR82MNE Samsung Electro-Mechanics	FIXED IND 820NH 150MA 900 MOHM	0
	CIL21N47NKNE Samsung Electro-Mechanics	FIXED IND 47NH 300MA 200MOHM SMD	0
	CIL21N82NMNE Samsung Electro-Mechanics	FIXED IND 82NH 300MA 200MOHM SMD	0
	CIL21Y8R2KNE Samsung Electro-Mechanics	FIXED IND 8.2UH 15MA 700MOHM SMD	0
	CIL21N47NMNE Samsung Electro-Mechanics	FIXED IND 47NH 300MA 200MOHM SMD	0
	CIL21S220KNE Samsung Electro-Mechanics	FIXED IND 22UH 5MA 1.1OHM SMD	0
	CIL21N82NKNE Samsung Electro-Mechanics	FIXED IND 82NH 300MA 200MOHM SMD	0
	CIL21Y6R8KNE Samsung Electro-Mechanics	FIXED IND 6.8UH 15MA 600MOHM SMD	0
	CIL21NR12KNE Samsung Electro-Mechanics	FIXED IND 120NH 250MA 200 MOHM	0
	CIL21S180KNE Samsung Electro-Mechanics	FIXED IND 18UH 5MA 900MOHM SMD	0
	CIL21NR82KNE Samsung Electro-Mechanics	FIXED IND 820NH 150MA 600 MOHM	0
	CIL21J4R7KNE Samsung Electro-Mechanics	FIXED IND 4.7UH 30MA 900MOHM SMD	0
	CIL21S220MNE Samsung Electro-Mechanics	FIXED IND 22UH 5MA 1.1OHM SMD	0
	CIL21J3R3KNE Samsung Electro-Mechanics	FIXED IND 3.3UH 30MA 600MOHM SMD	0
	CIL21NR27JNE Samsung Electro-Mechanics	FIXED IND 270NH 250MA 300 MOHM	0
	CIL21N68NKNE Samsung Electro-Mechanics	FIXED IND 68NH 300MA 200MOHM SMD	0
	CIL31J1R0KNE Samsung Electro-Mechanics	FIXED IND 1UH 100MA 400MOHM 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