Fixed Inductors

Part Number	Description / PDF	Quantity
0603DC-R18XJRW COILCRAFT	CERAMIC CHIP INDUCTOR,180NH	4451
LPS3015-223MRC COILCRAFT	SHIELDED POWER INDUCTORS 22H	41539
XGL4030-332MEC COILCRAFT	SHIELDED POWER INDUCTORS, 3.3UH	739
0402DC-7N4XJRW COILCRAFT	CERAMIC CHIP INDUCTORS, 7.4NH	2507
0402DF-900XJRW COILCRAFT	WIREWOUND FERRITE BEAD 90NH	2390
0402DC-20NXJRW COILCRAFT	CERAMIC CHIP INDUCTORS, 20.0NH	68
0402DC-39NXGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 39.0NH	6069
0603DC-R11XGRW COILCRAFT	CERAMIC CHIP INDUCTOR,110NH	4024
0402DC-27NXJRW COILCRAFT	CERAMIC CHIP INDUCTORS, 27.0NH	6766
0402DC-2N3XHRW COILCRAFT	CERAMIC CHIP INDUCTORS, 2.3NH	0
XPL2010-183MLC COILCRAFT	SHIELDED POWER INDUCTORS, 18UH	3558
0402DC-24NXJRW COILCRAFT	CERAMIC CHIP INDUCTORS, 24.0NH	910
XGL4020-332MEC COILCRAFT	SHIELDED POWER INDUCTORS, 3.3UH	10193
0402DC-9N8XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 9.8NH	1824
XGL4020-822MEC COILCRAFT	SHIELDED POWER INDUCTORS, 8.2UH	2498
0402DC-5N9XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 5.9NH	1484
0402DC-5N0XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 5.0NH	3523
0402DC-2N1XJRW COILCRAFT	CERAMIC CHIP INDUCTORS, 2.1NH	1471
0603DC-3N3XJRW COILCRAFT	CERAMIC CHIP INDUCTORS 3.3NH	3883
0603DC-6N2XJRW COILCRAFT	CERAMIC CHIP INDUCTORS 6.2NH	6990

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