Fixed Inductors

Image	Part Number	Description / PDF	Quantity	Rfq
	GLY18N05 Sprague Goodman	FIXED IND 18NH 350MA 450MOHM SMD	0
	GLY39N05 Sprague Goodman	FIXED IND 39NH 300MA 800MOHM SMD	0
	GLSVR8200 Sprague Goodman	FIXED IND 820NH SMD	0
	GLAR5610 Sprague Goodman	FIXED IND 560NH 170MA 1.5OHM SMD	0
	GLA68010 Sprague Goodman	FIXED IND 68UH 65MA 9OHM SMD	0
	GLY3N309 Sprague Goodman	FIXED IND 3.3NH 500MA 120 MOHM	0
	GLY82N05 Sprague Goodman	FIXED IND 82NH 250MA 1.5OHM SMD	0
	GL15A82N0002 Sprague Goodman	FIXED IND 82NH SMD	0
	GLST12010 Sprague Goodman	FIXED IND 12UH 740MA 280MOHM SMD	0
	GLU1R210 Sprague Goodman	FIXED IND 1.2UH 180MA 750 MOHM	0
	GLA1R505 Sprague Goodman	FIXED IND 1.5UH 115MA 2.7OHM SMD	0
	GLB1R010 Sprague Goodman	FIXED IND 1UH SMD	0
	GLY8N205 Sprague Goodman	FIXED IND 8.2NH 400MA 280 MOHM	0
	GLY3N905 Sprague Goodman	FIXED IND 3.9NH 450MA 150 MOHM	0
	GLA1R205 Sprague Goodman	FIXED IND 1.2UH 120MA 2.3OHM SMD	0
	GLX1R010 Sprague Goodman	FIXED IND 1UH 120MA 3.87OHM SMD	0
	GLY47N05 Sprague Goodman	FIXED IND 47NH 250MA 950MOHM SMD	0
	GL15AR100002 Sprague Goodman	FIXED IND 100NH SMD	0
	GLAR2220 Sprague Goodman	FIXED IND 220NH 360MA 290 MOHM	0
	GLA5R605 Sprague Goodman	FIXED IND 5.6UH 65MA 8.7OHM 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