Fixed Inductors

Part Number	Description / PDF	Quantity
0603DC-11NXGRW COILCRAFT	CERAMIC CHIP INDUCTOR,11NH	4128
0603DC-3N9XGRW COILCRAFT	CERAMIC CHIP INDUCTORS 3.9NH	3734
0603AF-201XJEW COILCRAFT	WIREWOUND INDUCTOR 201NH@7.9MHZ	5861
0603AF-85NXJEW COILCRAFT	WIREWOUND INDUCTOR 85NH@7.9MHZ	3848
0402DC-9N6XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 9.6NH	3199
0402DC-75NXJRW COILCRAFT	CERAMIC CHIP INDUCTORS, 75.0NH	4173
0603DC-39NXGRW COILCRAFT	CERAMIC CHIP INDUCTORS 39NH	4003
0402DC-5N0XJRW COILCRAFT	CERAMIC CHIP INDUCTORS, 5.0NH	2430
0402DC-4N7XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 4.7NH	7390
LPS4018-102NRC COILCRAFT	SHIELDED POWER INDUCTORS, 1.0UH	8562
0603DC-R12XJRW COILCRAFT	CERAMIC CHIP INDUCTOR,120NH	4193
LPS4018-222MRC COILCRAFT	SHIELDED POWER INDUCTORS, 2.2UH	74777
0603DC-62NXGRW COILCRAFT	CERAMIC CHIP INDUCTORS 62NH	3632
LPS3015-154MRC COILCRAFT	SHIELDED POWER INDUCTORS 150H	342
0402DC-5N5XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 5.5NH	1296
XPL2010-222MLC COILCRAFT	SHIELDED POWER INDUCTORS, 2.2UH	3393
0402DC-5N3XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 5.3NH	610
XGL4020-471MEC COILCRAFT	SHIELDED POWER INDUCTORS, 0.47UH	4730
0402DC-8N4XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 8.4NH	768
0402DC-R12XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 120.0NH	955

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