Fixed Inductors

Image	Part Number	Description / PDF	Quantity	Rfq
	ELL-6SH561M Panasonic	FIXED IND 560UH 180MA 3.7 OHM	0
	ELC-16B472L Panasonic	FIXED IND 4.7MH 360MA 3.3 OHM TH	0
	ELC-15E680 Panasonic	FIXED IND 68UH 3.5A 45 MOHM TH	0
	ELJ-EA1R0MF Panasonic	FIXED IND 1UH 500MA 70 MOHM SMD	0
	ELL-4GG3R3N Panasonic	FIXED IND 3.3UH 1.2A 110 MOHM	0
	ELJ-FB270JF Panasonic	FIXED IND 27UH 185MA 2.9 OHM SMD	0
	ELJ-PC330KF Panasonic	FIXED IND 33UH 120MA 6.5 OHM SMD	0
	ELJ-NCR47KF Panasonic	FIXED IND 470NH 125MA 1.58 OHM	0
	ELJ-PE4N7KF Panasonic	FIXED IND 4.7NH 2.1A 50 MOHM SMD	0
	ELJ-FCR47MF Panasonic	FIXED IND 470NH 155MA 1 OHM SMD	0
	ELC-10D121E Panasonic	FIXED IND 120UH 1.6A 120 MOHM TH	0
	ELJ-RE33NGFA Panasonic	FIXED IND 33NH 300MA 600 MOHM	0
	ELC-06D272E Panasonic	FIXED IND 2.7MH 100MA 6.08 OHM	0
	ELJ-RER10JF3 Panasonic	FIXED IND 100NH 200MA 1.8 OHM	0
	ELL-6PM100M Panasonic	FIXED IND 10UH 1A 85 MOHM SMD	0
	ELJ-FB4R7MF Panasonic	FIXED IND 4.7UH 350MA 810 MOHM	0
	ELL-5PS220M Panasonic	FIXED IND 22UH 750MA 290 MOHM	0
	ELJ-NA47NMF Panasonic	FIXED IND 47NH 450MA 200 MOHM	0
	ELJ-FC101JF Panasonic	FIXED IND 100UH 60MA 21 OHM SMD	0
	ELT-5KT100MA Panasonic	FIXED IND 10UH 680MA 360 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