Fixed Inductors

Image	Part Number	Description / PDF	Quantity
	L08053R3BEWTR Elco (AVX)	FIXED IND 3.3NH 750MA 110 MOHM	0
	LMLP0202N4R7CTAR Elco (AVX)	FIXED IND 4.7UH 670MA 290 MOHM	2500
	HLC028R2GTTR Elco (AVX)	FIXED IND 8.2NH 315MA 800 MOHM	0
	LCCI0201S5N6GTAR Elco (AVX)	FIXED IND 5.6NH 350MA 400 MOHM	15000
	HLQ023R3BTTR Elco (AVX)	FIXED IND 3.3NH 225MA 340 MOHM	0
	L06038R2CGSTR Elco (AVX)	FIXED IND 8.2NH 300MA 350 MOHM	1618
	LCCI0402S5N6GTAR Elco (AVX)	FIXED IND 5.6NH 600MA 230 MOHM	0
$L02012R2BHSTR\500$	L02012R2BHSTR\500 Elco (AVX)	FIXED IND 2.2NH 200MA 600 MOHM	5500
	LMLP0808M100CTAS Elco (AVX)	FIXED IND 10UH 3.1A 34 MOHM SMD	0
	LCCI0402J27NGTAR Elco (AVX)	FIXED IND 27NH 300MA 800 MOHM	0
	LCCI0402S2N4GTAR Elco (AVX)	FIXED IND 2.4NH 800MA 130 MOHM	10000
$L0805100JEWTR\500$	L0805100JEWTR\500 Elco (AVX)	FIXED IND 10NH 750MA 130 MOHM	0
	LMLP0405M3R3DTAS Elco (AVX)	FIXED IND 3.3UH 2.5A 87MOHM SMD	2000
$L0201R68AHSTR\500$	L0201R68AHSTR\500 Elco (AVX)	FIXED IND 0.68NH 500MA 200 MOHM	1645
	HLQ02100HTTR Elco (AVX)	FIXED IND 10NH 120MA 1 OHM SMD	0
	LCCI0402J18NGTAR Elco (AVX)	FIXED IND 18NH 300MA 650 MOHM	10000
	HL021R8BTTR Elco (AVX)	FIXED IND 1.8NH 337MA 154 MOHM	0
	HLC023R6BTTR Elco (AVX)	FIXED IND 3.6NH 457MA 350 MOHM	0
	LMLP05B5N3R3CTAR Elco (AVX)	FIXED IND 3.3UH 2.4A 48 MOHM SMD	739
	L0201R33AHSTR Elco (AVX)	FIXED INDUCTOR	0

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