Fixed Inductors

Part Number	Description / PDF	Quantity
IHLP4040DZERR78M11 Vishay / Dale	FIXED IND 780NH 27A 1.9 MOHM SMD	0
ISC1210EB22NM Vishay / Dale	FIXED IND 22NH 640MA 150 MOHM	0
IHLP1212ABEVR47M5A Vishay / Dale	FIXED IND 0.47 UH 5.99A 24.91 MO	0
ISC1812ESR18K Vishay / Dale	FIXED IND 180NH 468MA 320 MOHM	0
IHLD3232HBER100M5A Vishay / Dale	FIXED IND 10UH 5A 53.5 MOHM SMD	119
IHLP2020CZER2R2M5A Vishay / Dale	FIXED IND 2.2 UH 6.6 A 26 MOHM H	0
IHLP6767DZER8R2M01 Vishay / Dale	FIXED IND 8.2UH 11.5A 17.6 MOHM	0
IMC1812BN681K Vishay / Dale	FIXED IND 680UH 50MA 30 OHM SMD	0
IMC1812ES180J Vishay / Dale	FIXED IND 18UH 190MA 2.8 OHM SMD	0
ISC1812RQR15M Vishay / Dale	FIXED IND 150NH 491MA 290 MOHM	0
IHLM2525CZERR68M07 Vishay / Dale	FIXED IND 680NH 15.5A 5.2 MOHM	0
IMC1210SY181J Vishay / Dale	FIXED IND 180UH 60MA 17 OHM SMD	0
IMC1812RQ2R2J Vishay / Dale	FIXED IND 2.2UH 380MA 700 MOHM	0
ISC1812RV821J Vishay / Dale	FIXED IND 820UH 72MA 13.5 OHM	0
IHLP2525CZER2R2M07 Vishay / Dale	FIXED IND 2.2UH 8A 17.73 MOHM	0
ISC1210EB2R7K Vishay / Dale	FIXED IND 2.7UH 290MA 1 OHM SMD	0
IMC1210SY8R2J Vishay / Dale	FIXED IND 8.2UH 194MA 2 OHM SMD	0
IHLP2525CZERR82M07 Vishay / Dale	FIXED IND 820NH 13A 7.41 MOHM	0
IHLP6767GZER1R0M01 Vishay / Dale	FIXED IND 1UH 48A 1.38 MOHM SMD	1258
IHLE5050FHER680M51 Vishay / Dale	FIXED IND 68UH 4.9A 105.6 MOHM	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