Fixed Inductors

Part Number	Description / PDF	Quantity
IHLP2020CZETR68M01 Vishay / Dale	FIXED IND 680NH 10.2A 8.96MOHM	1990
ILSB1206ERR68K Vishay / Dale	FIXED IND 680NH 150MA 800 MOHM	0
IHLP4040EDERR47M5A Vishay / Dale	FIXED IND 470NH 35.5A 1.39MOHM	545
ISC1210ER1R0K Vishay / Dale	FIXED IND 1UH 400MA 600 MOHM SMD	0
IHLP1616ABER1R5M11 Vishay / Dale	FIXED IND 1.5UH 3.25A 75 MOHM	0
ISC1812ES150J Vishay / Dale	FIXED IND 15UH 252MA 1.1 OHM SMD	0
IMC1210SY56NK Vishay / Dale	FIXED IND 56NH 470MA 330 MOHM	0
IHD1ER822L Vishay / Dale	FIXED IND 8.2MH 110MA 20.8 OHM	0
IHLP1212ABEVR68M5A Vishay / Dale	FIXED IND 0.68 UH 4.98A 36.4 MOH	0
IHLP5050EZER1R0M5A Vishay / Dale	FIXED IND 1UH 36.64A 2.14 MOHM	239
IMC1210EBR47M Vishay / Dale	FIXED IND 470NH 450MA 500 MOHM	0
IHLP3232DZER3R3M5A Vishay / Dale	FIXED IND 3.3UH 11.3A 16.48 MOHM	0
IHD1EB822L Vishay / Dale	FIXED IND 8.2MH 110MA 20.8 OHM	0
IHXL1500VZEB3R3M51 Vishay / Dale	FIXED IND 3.3UH 150A 0.42 MOHM	0
IMC1812RQ121J Vishay / Dale	FIXED IND 120UH 110MA 8 OHM SMD	0
IHLP2020CZET1R5M11 Vishay / Dale	FIXED IND 1.5UH 7.5A 18.5MOHM SM	10
ISC1210EB6R8K Vishay / Dale	FIXED IND 6.8UH 205MA 1.6 OHM	0
IMC1210ER680J Vishay / Dale	FIXED IND 68UH 83MA 11 OHM SMD	0
IHLP3232DZERR82M01 Vishay / Dale	FIXED IND 820NH 19A 4.42 MOHM	3482
ISC1210BN8R2J Vishay / Dale	FIXED IND 8.2UH 195MA 1.65 OHM	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