Fixed Inductors

Image	Part Number	Description / PDF	Quantity	Rfq
	ELL-6UH120M Panasonic	FIXED IND 12UH 1.7A 71 MOHM SMD	0
	ELJ-ND1R0KF Panasonic	FIXED IND 1UH 120MA 3.88 OHM SMD	0
	ELC-12E561L Panasonic	FIXED IND 560UH 570MA 490 MOHM	0
	ELC-09D680DF Panasonic	FIXED IND 68UH 1A 140 MOHM TH	0
	ELC-15E392 Panasonic	FIXED IND 3.9MH 470MA 1.7 OHM TH	0
	ELC-16B101L Panasonic	FIXED IND 100UH 2.6A 72 MOHM TH	0
	ELJ-RFR10JF Panasonic	FIXED IND 100NH 90MA 5.5 OHM SMD	0
	ELJ-FC100KF Panasonic	FIXED IND 10UH 80MA 3.7 OHM SMD	0
	ELC-10D332E Panasonic	FIXED IND 3.3MH 280MA 3.2 OHM TH	0
	ELL-6RH151M Panasonic	FIXED IND 150UH 250MA 1.8 OHM	0
	ELL-6GG220M Panasonic	FIXED IND 22UH 850MA 300 MOHM	0
	ELC-12D471E Panasonic	FIXED IND 470UH 1.25A 380 MOHM	0
	ELL-5PRR47N Panasonic	FIXED IND 470NH 3.9A 12 MOHM SMD	0
	ELL-SFG100MA Panasonic	FIXED IND 10UH 800MA 230 MOHM	0
	ELC-10D101E Panasonic	FIXED IND 100UH 1.7A 110 MOHM TH	0
	ELL-CTV180M Panasonic	FIXED IND 18UH 3A 30 MOHM SMD	0
	ELC-12E220L Panasonic	FIXED IND 22UH 2.8A 33 MOHM TH	0
	ELC-16B5R6L Panasonic	FIXED IND 5.6UH 7.4A 16 MOHM TH	0
	ELL-ATV8R2N Panasonic	FIXED IND 8.2UH 3.7A 18 MOHM SMD	0
	ELJ-RE2N2ZF2 Panasonic	FIXED IND 2.2NH 500MA 90 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