Fixed Inductors

Part Number	Description / PDF	Quantity
0402DC-82NXGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 82.0NH	10080
0603DC-15NXGRW COILCRAFT	CERAMIC CHIP INDUCTOR,15NH	3795
0402DC-7N7XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 7.7NH	1872
0603DC-82NXGRW COILCRAFT	CERAMIC CHIP INDUCTORS 82NH	4324
XPL2010-103MLC COILCRAFT	SHIELDED POWER INDUCTORS, 10UH	11606
LPS3015-152MRC COILCRAFT	SHIELDED POWER INDUCTORS 1.5H	4329
0603DC-7N5XJRW COILCRAFT	CERAMIC CHIP INDUCTORS 7.5NH	4069
XPL2010-563MLC COILCRAFT	SHIELDED POWER INDUCTORS, 56UH	3282
XGL4030-682MEC COILCRAFT	SHIELDED POWER INDUCTORS, 6.8UH	17
0402DC-8N6XJRW COILCRAFT	CERAMIC CHIP INDUCTORS, 8.6NH	1267
0402DC-8N9XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 8.9NH	1835
0402DC-4N6XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 4.6NH	1257
XGL4030-122MEC COILCRAFT	SHIELDED POWER INDUCTORS, 1.2UH	974
0402DC-2N3XJRW COILCRAFT	CERAMIC CHIP INDUCTORS, 2.3NH	3311
LPS3015-473MRC COILCRAFT	SHIELDED POWER INDUCTORS, 47UH	2728
0402DC-5N4XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 5.4NH	1479
XGL4020-111MEC COILCRAFT	SHIELDED POWER INDUCTORS, 0.11UH	742
0603AF-421XJEW COILCRAFT	WIREWOUND INDUCTOR 420NH@7.9MHZ	6178
0402DF-332XJRW COILCRAFT	WIREWOUND FERRITE BEAD 3300NH	0
0402DC-68NXGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 68.0NH	10088

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