Fixed Inductors

Image	Part Number	Description / PDF	Quantity	Rfq
	ELJ-PE8N2KF Panasonic	FIXED IND 8.2NH 1.7A 60 MOHM SMD	0
	ELC-09D152DF Panasonic	FIXED IND 1.5MH 210MA 2.8 OHM TH	0
	ELL-ATV2R2N Panasonic	FIXED IND 2.2UH 6.2A 6.3 MOHM	0
	ELJ-RE1N0ZFA Panasonic	FIXED IND 1NH 500MA 50 MOHM SMD	0
	ELJ-FC100JF Panasonic	FIXED IND 10UH 80MA 3.7 OHM SMD	0
	ELJ-FCR22KF Panasonic	FIXED IND 220NH 190MA 700 MOHM	0
	ELJ-QE56NJFA Panasonic	FIXED IND 56NH 180MA 1.51 OHM	0
	ELJ-FB101KF Panasonic	FIXED IND 100UH 105MA 8.8 OHM	0
	ELJ-NCR39JF Panasonic	FIXED IND 390NH 130MA 1.47 OHM	0
	ELJ-PA2R2MF2 Panasonic	FIXED IND 2.2UH 800MA 170 MOHM	0
	ELL-4GM330M Panasonic	FIXED IND 33UH 300MA 700 MOHM	0
	ELL-6UH271M Panasonic	FIXED IND 270UH 370MA 1.2 OHM	0
	ELJ-PB390KF Panasonic	FIXED IND 39UH 230MA 1.6 OHM SMD	0
	ELC-09D391F Panasonic	FIXED IND 390UH 460MA 860 MOHM	0
	ELL-ATP8R2NB Panasonic	FIXED IND 8.2UH 3.7A 18MOHM SMD	0
	ELL-4GM3R6N Panasonic	FIXED IND 3.6UH 950MA 100 MOHM	0
	ELJ-RE2N2DF2 Panasonic	FIXED IND 2.2NH 500MA 90 MOHM	0
	ELJ-FBR33MF Panasonic	FIXED IND 330NH 630MA 350 MOHM	0
	ELC-18B6R8L Panasonic	FIXED IND 6.8UH 6.8A 15 MOHM TH	0
	ELC-12D562E Panasonic	FIXED IND 5.6MH 340MA 4.08 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