Fixed Inductors

Part Number	Description / PDF	Quantity
ISC1812ES6R8K Vishay / Dale	FIXED IND 6.8UH 306MA 750 MOHM	0
ISC1210SY5R6J Vishay / Dale	FIXED IND 5.6UH 210MA 1.4 OHM	0
IHLP2525CZER100M06 Vishay / Dale	FIXED IND 10UH 3A 97.71 MOHM SMD	0
ISC1210SYR18M Vishay / Dale	FIXED IND 180NH 580MA 240 MOHM	0
IMC0603ER4N7S01 Vishay / Dale	FIXED IND 4.7NH 700MA 110 MOHM	0
ISC1812ER391K Vishay / Dale	FIXED IND 390UH 92MA 8.2 OHM SMD	0
IHLP4040DZER4R7M11 Vishay / Dale	FIXED IND 4.7UH 9.5A 14.2 MOHM	86
IFSC1111ABER220M01 Vishay / Dale	FIXED IND 22UH 670MA 756 MOHM	5490
IMC1210SY100K Vishay / Dale	FIXED IND 10UH 189MA 2.1 OHM SMD	730
IMC1210ER10NM Vishay / Dale	FIXED IND 10NH 734MA 130 MOHM	0
ISC1812RQR18M Vishay / Dale	FIXED IND 180NH 468MA 320 MOHM	0
ISC1210BNR15M Vishay / Dale	FIXED IND 150NH 600MA 200 MOHM	0
ISC1812RV150K Vishay / Dale	FIXED IND 15UH 252MA 1.1 OHM SMD	0
IHD1EB122L Vishay / Dale	FIXED IND 1.2MH 310MA 2.55 OHM	0
IMC1812EBR15M Vishay / Dale	FIXED IND 150NH 450MA 300 MOHM	0
IHLP2020BZERR10M01 Vishay / Dale	FIXED IND 100NH 17A 3.9 MOHM SMD	93589
ISC1210SYR18J Vishay / Dale	FIXED IND 180NH 580MA 240 MOHM	0
IFSC1515AHER150M01 Vishay / Dale	FIXED IND 15UH 1.25A 222 MOHM	3746
IHLP6767DZERR47M01 Vishay / Dale	FIXED IND 470NH 49A 1.38 MOHM	0
ISC1812ES681J Vishay / Dale	FIXED IND 680UH 76MA 12 OHM 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