Fixed Inductors

Image	Part Number	Description / PDF	Quantity
$L02011R5BHSTR\500$	L02011R5BHSTR\500 Elco (AVX)	FIXED IND 1.5NH 250MA 500 MOHM	0
	LCCI0201S3N3GTAR Elco (AVX)	FIXED IND 3.3NH 450MA 300 MOHM	15000
	LMLP0405MR68DTAS Elco (AVX)	FIXED IND 680NH 6A 18MOHM SMD	1976
	LMLP07C7MR56DTAS Elco (AVX)	FIXED IND 560NH 20A 4.2MOHM SMD	790
	LMLP0808M150CTAS Elco (AVX)	FIXED IND 15UH 2.4A 50MOHM SMD	994
	HL023R6BTTR Elco (AVX)	FIXED IND 3.6NH 311MA 280 MOHM	7411
	LCCI0603J18NGTAR Elco (AVX)	FIXED IND 18NH 600MA 450 MOHM	4000
	LMLP05D5M150CTAS Elco (AVX)	FIXED IND 15UH 1.8A 80 MOHM SMD	0
	L06031R8CGWTR Elco (AVX)	FIXED IND 1.8NH 1A 70 MOHM SMD	0
	LCCI0603J10NGTAR Elco (AVX)	FIXED IND 10NH 600MA 300 MOHM	4000
	LMLP05A6M1R5DTAS Elco (AVX)	FIXED IND 1.5UH 5.5A 30.5 MOHM	3000
	HLQ021R8BTTR Elco (AVX)	FIXED IND 1.8NH 300MA 160 MOHM	0
	LMLP0606N6R8CTAR Elco (AVX)	FIXED IND 6.8UH 1A 372 MOHM SMD	0
	LCCI0603S4N7GTAR Elco (AVX)	FIXED IND 4.7NH 1A 200 MOHM SMD	4000
	LMLP06C6N1R5CTAS Elco (AVX)	FIXED IND 1.5UH 4.2A 16 MOHM SMD	0
	HL023R0BTTR Elco (AVX)	FIXED IND 3NH 324MA 245 MOHM SMD	10000
	LMLP0202M220CTAR Elco (AVX)	FIXED IND 22UH 300MA 1.47OHM SMD	2385
	LCCI0402S2N2GTAR Elco (AVX)	FIXED IND 2.2NH 900MA 130 MOHM	10000
	LMXS1212M330HTAS Elco (AVX)	FIXED IND 33UH 2.7A 97 MOHM SMD	0
	LCCI0201B0N3GTAR Elco (AVX)	FIXED IND 0.3NH 850MA 70 MOHM	15000

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