Fixed Inductors

Part Number	Description / PDF	Quantity
CIH10T68NJNC Samsung Electro-Mechanics	FIXED IND 68NH 350MA 850 MOHM	2
CIL10S180MNC Samsung Electro-Mechanics	FIXED IND 18UH 1MA 1.85OHM SMD	0
CIH10TR18JNC Samsung Electro-Mechanics	FIXED IND 180NH 250MA 1.3 OHM	1
CIL10NR68JNC Samsung Electro-Mechanics	FIXED IND 680NH 35MA 1.7OHM SMD	0
CIG22B4R7MNE Samsung Electro-Mechanics	FIXED IND 4.7UH 1A 250 MOHM SMD	460
CIL10J4R7KNC Samsung Electro-Mechanics	FIXED IND 4.7UH 15MA 2.1OHM SMD	0
CIH05T1N0SNC Samsung Electro-Mechanics	FIXED IND 1NH 300MA 120 MOHM SMD	16565
CIGT201208EHR47MNE Samsung Electro-Mechanics	FIXED IND 470NH 3.7A 35MOHM SMD	46182
CIGW252010GLR47MNE Samsung Electro-Mechanics	FIXED IND 470NH 5.9A 20MOHM SMD	61640
CIGT252010LMR47MNE Samsung Electro-Mechanics	FIXED IND 470NH 4.2A 29MOHM SMD	50847
CIG22E3R3MNE Samsung Electro-Mechanics	FIXED IND 3.3UH 1.1A 200 MOHM	0
CIL10S330KNC Samsung Electro-Mechanics	FIXED IND 33UH 1MA 2.95OHM SMD	0
CIH05T27NJNC Samsung Electro-Mechanics	FIXED IND 27NH 250MA 900 MOHM	1067
CIGT252010EH2R2MNE Samsung Electro-Mechanics	FIXED IND 2.2UH 2.4A 80MOHM SMD	111633
CIL10S150KNC Samsung Electro-Mechanics	FIXED IND 15UH 1MA 1.7OHM SMD	0
CIH10T82NJNC Samsung Electro-Mechanics	FIXED IND 82NH 350MA 950 MOHM	0
CIH05TR10JNC Samsung Electro-Mechanics	FIXED IND 100NH 130MA 1.6 OHM	7
CIH05T3N0SNC Samsung Electro-Mechanics	FIXED IND 3NH 300MA 190 MOHM SMD	32267
CIGT252007LM1R0MNC Samsung Electro-Mechanics	FIXED IND 1UH 2.5A 60MOHM SMD	0
CIGT252012LMR47MNE Samsung Electro-Mechanics	FIXED IND 470NH SMD	60690

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