Fixed Inductors

Part Number	Description / PDF	Quantity
XGL4030-102MEC COILCRAFT	SHIELDED POWER INDUCTORS, 1.0UH	31
0603DC-R47XJRW COILCRAFT	CERAMIC CHIP INDUCTOR,470NH	1736
0402DC-4N1XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 4.1NH	1635
0603DC-9N1XJRW COILCRAFT	CERAMIC CHIP INDUCTORS 9.1NH	4279
0603DC-R27XGRW COILCRAFT	CERAMIC CHIP INDUCTOR,270NH	3958
XPL2010-332MLC COILCRAFT	SHIELDED POWER INDUCTORS, 3.3UH	10247
0603DC-R22XGRW COILCRAFT	CERAMIC CHIP INDUCTOR,220NH	2615
0402DC-7N2XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 7.2NH	1601
0402DC-30NXGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 30.0NH	11854
0402DC-6N1XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 6.1NH	1574
0603DC-30NXJRW COILCRAFT	CERAMIC CHIP INDUCTORS 30NH	4432
0402DC-3N8XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 3.8NH	88
XPL2010-682MLC COILCRAFT	SHIELDED POWER INDUCTORS, 6.8UH	3322
0402DC-N90XJRW COILCRAFT	CERAMIC CHIP INDUCTORS, 0.9NH	1347
0402DC-8N0XJRW COILCRAFT	CERAMIC CHIP INDUCTORS, 8.0NH	1277
0603AF-472XJEW COILCRAFT	WIREWOUND INDUCTOR 4700NH@7.9MHZ	3380
0402DC-47NXGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 47.0NH	1295
0402DC-7N5XJRW COILCRAFT	CERAMIC CHIP INDUCTORS, 7.5NH	862
0402DC-2N5XJRW COILCRAFT	CERAMIC CHIP INDUCTORS, 2.5NH	1406
0402DC-6N9XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 6.9NH	1794

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