Fixed Inductors

Part Number	Description / PDF	Quantity
ELJ-QF2N0DF Panasonic	FIXED IND 2NH 400MA 90 MOHM SMD	23735
ELC-18E821 Panasonic	FIXED IND 820UH 1.1A 210 MOHM TH	0
ELL-SFG151MA Panasonic	FIXED IND 150UH 190MA 3.8 OHM	4000
ELL-VGG1R0N Panasonic	FIXED IND 1UH 1.8A 52 MOHM SMD	43
ETQ-P5M1R5YFC Panasonic	FIXED IND 1.45UH 21.4A 4.2 MOHM	1831
ELJ-RF18NGFB Panasonic	FIXED IND 18NH 240MA 700 MOHM	20615
ETQ-P3M2R2HFP Panasonic	FIXED IND 2.2UH 6.3A 21.5 MOHM	6279
ELC-3FN6R8N Panasonic	FIXED IND 6.8UH 620MA 360 MOHM	1440
ELC-18E822L Panasonic	FIXED IND 8.2MH 350MA 2.4 OHM TH	0
ELL-ATV390M Panasonic	FIXED IND 39UH 1.6A 74 MOHM SMD	0
ELJ-NC82NJF Panasonic	FIXED IND 82NH 185MA 730 MOHM	12383
ELL-6PGR08N Panasonic	FIXED IND 800NH 2.8A 24 MOHM SMD	1160
ELL-VFG2R2NC Panasonic	FIXED IND 2.2UH 1.4A 87 MOHM SMD	191
ELJ-QF24NGF Panasonic	FIXED IND 24NH 200MA 1 OHM SMD	16554
ETQ-P5M150YFC Panasonic	FIXED IND 15UH 7A 39.16MOHM SMD	0
ELJ-PF3N9DFB Panasonic	FIXED IND 3.9NH 1.4A 80 MOHM SMD	9
ELC-18E102L Panasonic	FIXED IND 1MH 1A 280 MOHM TH	0
ELC-18E560 Panasonic	FIXED IND 56UH 3.8A 31 MOHM TH	0
ELC-10E680L Panasonic	FIXED IND 68UH 1.2A 150 MOHM TH	1118
ELL-5PS820M Panasonic	FIXED IND 82UH 360MA 1.16 OHM	3350

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