Fixed Inductors

Image	Part Number	Description / PDF	Quantity	Rfq
	ETQ-P6F1R8BFA Panasonic	FIXED IND 1.71UH 14A 3.3 MOHM	0
	ELL-8UV220M Panasonic	FIXED IND 22UH 2.05MA 40 OHM SMD	0
	ELC-12E182L Panasonic	FIXED IND 1.8MH 320MA 1.9 OHM TH	0
	ELC-09D331F Panasonic	FIXED IND 330UH 490MA 650 MOHM	0
	ELJ-FB2R2MF Panasonic	FIXED IND 2.2UH 410MA 610 MOHM	0
	ELL-6PM4R7N Panasonic	FIXED IND 4.7UH 1.68A 47 MOHM	0
	ELL-6PM220M Panasonic	FIXED IND 22UH 700MA 200 MOHM	0
	ELC-10E270L Panasonic	FIXED IND 27UH 1.9A 62 MOHM TH	0
	ELJ-FB680KF Panasonic	FIXED IND 68UH 115MA 5.3 OHM SMD	0
	ELC-18B122L Panasonic	FIXED IND 1.2MH 1A 440 MOHM TH	0
	ELJ-FC3R3KF Panasonic	FIXED IND 3.3UH 135MA 1.3 OHM	0
	ELJ-RE47NGFA Panasonic	FIXED IND 47NH 250MA 950 MOHM	0
	ELJ-QE5N6DFA Panasonic	FIXED IND 5.6NH 600MA 110 MOHM	0
	ELC-16B332L Panasonic	FIXED IND 3.3MH 470MA 2 OHM TH	0
	ELJ-NA2R2JF Panasonic	FIXED IND 2.2UH 110MA 3.2 OHM	0
	ELJ-RF15NGFB Panasonic	FIXED IND 15NH 240MA 600 MOHM	0
	ELJ-FBR82MF Panasonic	FIXED IND 820NH 500MA 500 MOHM	0
	ETQ-P6F102HFA Panasonic	FIXED IND 10.2UH 6.5A 13.3 MOHM	0
	ELL-6SH221M Panasonic	FIXED IND 220UH 280MA 1.4 OHM	0
	ELL-ATV150M Panasonic	FIXED IND 15UH 2.8A 32 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