Fixed Inductors

Part Number	Description / PDF	Quantity
0402DF-771XJRW COILCRAFT	WIREWOUND FERRITE BEAD 770NH	5440
0402DC-16NXGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 16.0NH	808
LPS3015-333MRC COILCRAFT	SHIELDED POWER INDUCTORS 33H	763
0402DC-36NXGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 36.0NH	329
0402DC-4N8XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 4.8NH	1758
0402DC-15NXJRW COILCRAFT	CERAMIC CHIP INDUCTORS, 15.0NH	3256
0402DC-6N5XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 6.5NH	1400
0402DC-4N5XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 4.5NH	963
0402DC-4N0XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 4.0NH	1657
0402DC-3N9XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 3.9NH	3678
0603DC-R47XGRW COILCRAFT	CERAMIC CHIP INDUCTOR,470NH	4142
XGL4020-102MEC COILCRAFT	SHIELDED POWER INDUCTORS, 1.0UH	9500
0402DC-4N4XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 4.4NH	1443
0402DC-5N6XJRW COILCRAFT	CERAMIC CHIP INDUCTORS, 5.6NH	4396
0402DF-770XJRW COILCRAFT	WIREWOUND FERRITE BEAD 77NH	2803
LPS4018-183MRC COILCRAFT	SHIELDED POWER INDUCTORS, 18UH	1195
0402DC-27NXGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 27.0NH	7903
0402DC-3N3XGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 3.3NH	4908
0603DC-R13XJRW COILCRAFT	CERAMIC CHIP INDUCTOR,130NH	4442
0603DC-3N9XJRW COILCRAFT	CERAMIC CHIP INDUCTORS 3.9NH	5701

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