Fixed Inductors

Image	Part Number	Description / PDF	Quantity	Rfq
	ELJ-RF15NJF Panasonic	FIXED IND 15NH 240MA 600 MOHM	0
	ELJ-QE47NJFA Panasonic	FIXED IND 47NH 190MA 1.23 OHM	0
	ELJ-FAR56MF2 Panasonic	FIXED IND 560NH 275MA 490 MOHM	0
	ELC-12D331E Panasonic	FIXED IND 330UH 1.34A 300 MOHM	0
	ELJ-RE5N6JFA Panasonic	FIXED IND 5.6NH 430MA 180 MOHM	0
	ELL-VGG6R8N Panasonic	FIXED IND 6.8UH 800MA 230 MOHM	0
	ETQ-A15B220 Panasonic	FIXED IND 22UH 7A 15 MOHM TH	0
	ELC-15E270 Panasonic	FIXED IND 27UH 4.1A 29 MOHM TH	0
	ELL-5PM330M Panasonic	FIXED IND 33UH 530MA 270 MOHM	0
	ELC-18B4R7L Panasonic	FIXED IND 4.7UH 7.8A 12 MOHM TH	0
	ELJ-RF82NGFB Panasonic	FIXED IND 82NH 110MA 4.5 OHM SMD	0
	ELJ-PE4N7KFA Panasonic	FIXED IND 4.7NH 2.1A 50 MOHM SMD	0
	ELC-06D561E Panasonic	FIXED IND 560UH 220MA 1.22 OHM	0
	ELJ-EA1R5MF Panasonic	FIXED IND 1.5UH 390MA 80 MOHM	0
	ELJ-SA220KF Panasonic	FIXED IND 22UH 12MA 2.8 OHM SMD	0
	ELL-6SH180M Panasonic	FIXED IND 18UH 1A 130 MOHM SMD	0
	ELL-CTV101M Panasonic	FIXED IND 100UH 1.2A 150 MOHM	0
	ELL-6SH101M Panasonic	FIXED IND 100UH 400MA 680 MOHM	0
	ELL-VEG2R2N Panasonic	FIXED IND 2.2UH 1.25A 110 MOHM	0
	ELL-6UH330M Panasonic	FIXED IND 33UH 1.1A 130 MOHM 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