Fixed Inductors

Part Number	Description / PDF	Quantity
LCCI0201J27NGTAR Elco (AVX)	FIXED IND 27NH 140MA 1.8 OHM SMD	15000
LMLP0303N2R2CTAR Elco (AVX)	FIXED IND 2.2UH 1.1A 95 MOHM SMD	0
L04023R3BHNTR Elco (AVX)	FIXED IND 3.3NH 250MA 400 MOHM	3095
LMLP06C6M101CTAS Elco (AVX)	FIXED IND 100UH 660MA 600 MOHM	1980
LMLP03A2N1R0CTAR Elco (AVX)	FIXED IND 1UH 1.49A 50 MOHM SMD	0
HLC025R6BTTR Elco (AVX)	FIXED IND 5.6NH 375MA 500 MOHM	0
LMLP05D5M100CTAS Elco (AVX)	FIXED IND 10UH 2.1A 56 MOHM SMD	0
LMLP06D6M100CTAS Elco (AVX)	FIXED IND 10UH 2.5A 47 MOHM SMD	0
LMLP0404N3R3CTAS Elco (AVX)	FIXED IND 3.3UH 820MA 180 MOHM	5000
HL02120GTTR Elco (AVX)	FIXED IND 12NH 210MA 756 MOHM	0
HLQ022R2BTTR Elco (AVX)	FIXED IND 2.2NH 245MA 200 MOHM	14327
LMXS1010N100LTAS Elco (AVX)	FIXED IND 10UH 3.18A 59 MOHM SMD	1547
LMLP13B3MR68DTAS Elco (AVX)	FIXED IND 680NH 35A 1.6MOHM SMD	400
LCCI0201J6N8GTAR Elco (AVX)	FIXED IND 6.8NH 300MA 500 MOHM	15000
LCCI0603S5N6GTAR Elco (AVX)	FIXED IND 5.6NH 600MA 230 MOHM	4000
HLC023R3BTTR Elco (AVX)	FIXED IND 3.3NH 476MA 340 MOHM	0
LMLP03B3N4R7CTAR Elco (AVX)	FIXED IND 4.7UH 1.04A 120 MOHM	1885
L06032R2CGSTR Elco (AVX)	FIXED IND 2.2NH 1A 80 MOHM SMD	1836
L0805150GEWTR Elco (AVX)	FIXED IND 15NH 750MA 200 MOHM	0
HLC02150HTTR Elco (AVX)	FIXED IND 15NH 240MA 1.2 OHM SMD	9920

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