Fixed Inductors

Part Number	Description / PDF	Quantity
LMLP03A2M150CTAR Elco (AVX)	FIXED IND 15UH 485MA 450 MOHM	0
LMLP0303M150CTAR Elco (AVX)	FIXED IND 15UH 400MA 740 MOHM	0
HLC02220HTTR Elco (AVX)	FIXED IND 22NH 202MA 1.9 OHM SMD	0
L0805180JEWTR Elco (AVX)	FIXED IND 18NH 500MA 350 MOHM	0
LMLP0405MR15DTAS Elco (AVX)	FIXED IND 150NH 9A 6.6MOHM SMD	2000
LCCI0402J33NGTAR Elco (AVX)	FIXED IND 33NH 200MA 900 MOHM	0
LMLP07C7M2R2DTAS Elco (AVX)	FIXED IND 2.2UH 10A 12MOHM SMD	675800
LMLP07B7MR36DTAS Elco (AVX)	FIXED IND 360NH 17A 4.6MOHM SMD	1500
L0603100GGSTR Elco (AVX)	FIXED IND 10NH 300MA 450 MOHM	2799
LCCI0201J8N2GTAR Elco (AVX)	FIXED IND 8.2NH 250MA 550 MOHM	14950
LMLP05A6NR10DTAS Elco (AVX)	FIXED INDUCTOR 100NH SMD	3000
LMLP05B5M150CTAR Elco (AVX)	FIXED IND 15UH 1.2A 165MOHM SMD	635
HLQ021R5BTTR Elco (AVX)	FIXED IND 1.5NH 330MA 150 MOHM	0
L06035R6CGWTR Elco (AVX)	FIXED IND 5.6NH 300MA 250 MOHM	14295
LMLP0303N1R0CTAR Elco (AVX)	FIXED IND 1UH 1.4A 65 MOHM SMD	0
LMLP06C6M680CTAS Elco (AVX)	FIXED IND 68UH 770MA 420 MOHM	0
LMLP04A4M150CTAS Elco (AVX)	FIXED IND 15UH 600MA 400 MOHM	0
LMLP0808M220CTAS Elco (AVX)	FIXED IND 22UH 2.2A 66 MOHM SMD	0
L04021R0BHNTR Elco (AVX)	FIXED IND 1NH 500MA 150 MOHM SMD	5504
AL01647N0JTS Elco (AVX)	FIXED IND 47NH 3A 5.6 MOHM SMD	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