Fixed Inductors

Image	Part Number	Description / PDF	Quantity	Rfq
	ELL-6PM680M Panasonic	FIXED IND 68UH 400MA 600 MOHM	0
	ELC-10E3R9L Panasonic	FIXED IND 3.9UH 2.9A 24 MOHM TH	0
	ELJ-RF5N6DF Panasonic	FIXED IND 5.6NH 340MA 190 MOHM	0
	ELL-6PV560M Panasonic	FIXED IND 56UH 450MA 410 MOHM	0
	ELJ-PC2R2MF Panasonic	FIXED IND 2.2UH 390MA 650 MOHM	0
	ELL-CTV821M Panasonic	FIXED IND 820UH 440MA 1.14 OHM	0
	ELJ-LA101KF Panasonic	FIXED IND 100UH 110MA 9.5 OHM	0
	ELL-ATP1R0NB Panasonic	FIXED IND 1UH 8A 3.6MOHM SMD	0
	ELJ-NCR39KF Panasonic	FIXED IND 390NH 130MA 1.47 OHM	0
	ELC-15E562 Panasonic	FIXED IND 5.6MH 390MA 2.6 OHM TH	0
	ELL-ATV1R5N Panasonic	FIXED IND 1.5UH 6.7A 5.3 MOHM	0
	ELC-16B272L Panasonic	FIXED IND 2.7MH 540MA 1.57 OHM	0
	ELJ-RE22NGFA Panasonic	FIXED IND 22NH 300MA 500 MOHM	0
	ELJ-FA181JF Panasonic	FIXED IND 180UH 50MA 17 OHM SMD	0
	ELL-6PM6R8N Panasonic	FIXED IND 6.8UH 1.35A 57 MOHM	0
	ELL-ATP1R5NB Panasonic	FIXED IND 1.5UH 7A 4.4MOHM SMD	0
	ELC-10E820L Panasonic	FIXED IND 82UH 1A 190 MOHM TH	0
	ELL-CTV330M Panasonic	FIXED IND 33UH 2.2A 50 MOHM SMD	0
	ELC-09D820DF Panasonic	FIXED IND 82UH 900MA 160 MOHM TH	0
	ELL-8TP680MB Panasonic	FIXED IND 68UH 1.3A 140 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