Fixed Inductors

Part Number	Description / PDF	Quantity
ISC1812RV3R3J Vishay / Dale	FIXED IND 3.3UH 357MA 550 MOHM	0
ISC1812EB820J Vishay / Dale	FIXED IND 82UH 156MA 2.86 OHM	0
IMC1210BN1R0K Vishay / Dale	FIXED IND 1UH 400MA 700 MOHM SMD	0
IHLM2525CZERR47M01 Vishay / Dale	FIXED IND 470NH 17.5A 4.2 MOHM	1773
IHLP5050EZERR47M5A Vishay / Dale	FIXED IND 470NH 49.88A 1.23 MOHM	220
IHLP1212ABERR56M11 Vishay / Dale	FIXED IND 560NH 5.1A 22 MOHM SMD	0
ISC1812ER2R7J Vishay / Dale	FIXED IND 2.7UH 378MA 490 MOHM	0
IMC1812BNR47J Vishay / Dale	FIXED IND 470NH 355MA 800 MOHM	0
ISC1812ESR82M Vishay / Dale	FIXED IND 820NH 271MA 950 MOHM	0
IHLP4040DZERR47M8A Vishay / Dale	FIXED IND 470NH 30A 1.66 MOHM	500
IHLP2525CZERR47M51 Vishay / Dale	FIXED IND 470NH 20A 4.14 MOHM	0
IHLP5050FDER4R7M5A Vishay / Dale	FIXED IND 4.7UH 17.4A 7.93 MOHM	0
IMC1812ER1R0K Vishay / Dale	FIXED IND 1UH 450MA 500 MOHM SMD	1320
IMC1812ER5R6K Vishay / Dale	FIXED IND 5.6UH 300MA 1.1 OHM	109
ISC1210BN82NK Vishay / Dale	FIXED IND 82NH 460MA 450 MOHM	0
ISC1812RQ470K Vishay / Dale	FIXED IND 47UH 183MA 2.1 OHM SMD	0
IHLP2020CZER5R6M11 Vishay / Dale	FIXED IND 5.6UH 4.25A 70.6 MOHM	0
IMC1812EB221K Vishay / Dale	FIXED IND 220UH 100MA 10 OHM SMD	0
IHLP4040DZER5R6M51 Vishay / Dale	FIXED IND 5.6UH 9.3A 17.6 MOHM	0
IMC1812RL100K Vishay / Dale	FIXED IND 10UH 250MA 1.6 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