Fixed Inductors

Image	Part Number	Description / PDF	Quantity	Rfq
	IMC1812EB680K Vishay / Dale	FIXED IND 68UH 130MA 6 OHM SMD	0
	IMC0603ER10NJ01 Vishay / Dale	FIXED IND 10NH 700MA 130 MOHM	0
	IHD3ER102L Vishay / Dale	FIXED IND 1MH 800MA 844 MOHM TH	0
	IMC1210BNR27K Vishay / Dale	FIXED IND 270NH 456MA 360 MOHM	0
	ISC1812RQR82M Vishay / Dale	FIXED IND 820NH 271MA 950 MOHM	0
	IHD3EB183L Vishay / Dale	FIXED IND 18MH 160MA 14.8 OHM TH	0
	IMC0603ERR22G01 Vishay / Dale	FIXED IND 220NH 200MA 1.7 OHM	0
	ILSB0603ER6R8K Vishay / Dale	FIXED IND 6.8UH 15MA 1.7 OHM SMD	0
	IMC1210BN560K Vishay / Dale	FIXED IND 56UH 87MA 10 OHM SMD	0
	IMC1812RQ561K Vishay / Dale	FIXED IND 560UH 50MA 30 OHM SMD	0
	IMC1812RQR27K Vishay / Dale	FIXED IND 270NH 450MA 450 MOHM	0
	IHLP4040DZER100M51 Vishay / Dale	FIXED IND 10UH 6.5A 33.06 MOHM	0
	ISC1210BN3R9K Vishay / Dale	FIXED IND 3.9UH 250MA 1.2 OHM	0
	ISC1210BN1R5J Vishay / Dale	FIXED IND 1.5UH 370MA 750 MOHM	0
	IHD3ER560L Vishay / Dale	FIXED IND 56UH 3.2A 43 MOHM TH	0
	IMC1812EB120K Vishay / Dale	FIXED IND 12UH 225MA 2 OHM SMD	0
	IMC1210EB680J Vishay / Dale	FIXED IND 68UH 83MA 11 OHM SMD	0
	ISC1210SY4R7J Vishay / Dale	FIXED IND 4.7UH 220MA 1.25 OHM	0
	IMC1812RV220K Vishay / Dale	FIXED IND 22UH 180MA 3.2 OHM SMD	0
	IMC1210BN27NJ Vishay / Dale	FIXED IND 27NH 564MA 220 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