Fixed Inductors

Part Number	Description / PDF	Quantity
IMC1812BN471J Vishay / Dale	FIXED IND 470UH 62MA 26 OHM SMD	0
IHLE4040DDER330M5A Vishay / Dale	FIXED IND 33UH 3.7A 117.7 MOHM	0
IHLP4040DZERR47M51 Vishay / Dale	FIXED IND 470NH 30A 1.66 MOHM	0
IMC1812EB4R7K Vishay / Dale	FIXED IND 4.7UH 315MA 1 OHM SMD	0
IMC1812BN56NM Vishay / Dale	FIXED IND 56NH 450MA 350 MOHM	0
IFSC0806AZER3R3M01 Vishay / Dale	FIXED IND 3.3UH 1.05A 297 MOHM	0
IHHP0806AZERR47M01 Vishay / Dale	FIXED IND 470NH 3.6A 39 MOHM SMD	12700
IHD3EB150L Vishay / Dale	FIXED IND 15UH 4A 20 MOHM TH	0
ISC1812ER102J Vishay / Dale	FIXED IND 1MH 66MA 16 OHM SMD	0
ILSB0805ER1R2K Vishay / Dale	FIXED IND 1.2UH 50MA 500 MOHM	0
IHLP6767DZER150M11 Vishay / Dale	FIXED IND 15UH 9A 30.58 MOHM SMD	1108
IMC1812RQ100K Vishay / Dale	FIXED IND 10UH 250MA 1.6 OHM SMD	0
ILSB0805ERR18K Vishay / Dale	FIXED IND 180NH 250MA 400 MOHM	0
IHLP5050CEER1R0M06 Vishay / Dale	FIXED IND 1UH 24A 3.21 MOHM SMD	0
IHLP4040DZER5R6M01 Vishay / Dale	FIXED IND 5.6UH 8.5A 19.3 MOHM	8411
ISC1812ES5R6K Vishay / Dale	FIXED IND 5.6UH 333MA 690 MOHM	0
ISC1210BN680K Vishay / Dale	FIXED IND 68UH 90MA 10 OHM SMD	0
ISC1812ETR27K Vishay / Dale	FIXED IND 270NH SMD	0
ISC1812ET3R3K Vishay / Dale	FIXED IND 3.3UH 357MA 550 MOHM	0
IMC1812ES271J Vishay / Dale	FIXED IND 270UH 92MA 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