Fixed Inductors

Part Number	Description / PDF	Quantity
IMC1812RV271K Vishay / Dale	FIXED IND 270UH 92MA 12 OHM SMD	0
IMC1210ERR15K Vishay / Dale	FIXED IND 150NH 548MA 250 MOHM	0
ISC1812RQR27M Vishay / Dale	FIXED IND 270NH SMD	0
IMC0805ER68NJ01 Vishay / Dale	FIXED IND 68NH 500MA 270 MOHM	0
IHLP3232CZERR47M01 Vishay / Dale	FIXED IND 470NH 21.5A 3.33 MOHM	0
IMC0805ER8R2J01 Vishay / Dale	FIXED IND 8.2NH 120MA 3.5 OHM	0
IMC1812RV120J Vishay / Dale	FIXED IND 12UH 225MA 2 OHM SMD	0
IHLP3232DZER220M5A Vishay / Dale	FIXED IND 22UH 3.7A 110.21 MOHM	0
ISC1210EB100K Vishay / Dale	FIXED IND 10UH 185MA 2 OHM SMD	0
ISC1812RQ331K Vishay / Dale	FIXED IND 330UH 96MA 7.54 OHM	0
IHLP5050FDER4R7M51 Vishay / Dale	FIXED IND 4.7UH 17.4A 7.93 MOHM	250
ISC1812ER151K Vishay / Dale	FIXED IND 150UH 130MA 4.16 OHM	0
IHD1EB222L Vishay / Dale	FIXED IND 2.2MH 240MA 4.4 OHM TH	0
IHLP6767GZERR33M11 Vishay / Dale	FIXED IND 330NH 75.5A 0.82 MOHM	0
IMC1812RV1R0J Vishay / Dale	FIXED IND 1UH 450MA 500 MOHM SMD	0
IMC1210BNR12M Vishay / Dale	FIXED IND 120NH 584MA 220 MOHM	0
IHLP2020CZET5R6M01 Vishay / Dale	FIXED IND 5.6UH 3A 108MOHM SMD	1985
IHLP5050CEER2R2M06 Vishay / Dale	FIXED IND 2.2UH 16A 7.2 MOHM SMD	0
IHLP5050FDER6R8M01 Vishay / Dale	FIXED IND 6.8UH 11.5A 14 MOHM	0
ISC1210ER1R5J Vishay / Dale	FIXED IND 1.5UH 370MA 750 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