Fixed Inductors

Image	Part Number	Description / PDF	Quantity
	LMLP04B4M680CTAS Elco (AVX)	FIXED IND 68UH 320MA 1OHM SMD	3500
	LMLP0707M8R2DTAS Elco (AVX)	FIXED IND 8.2UH 3.2A 116MOHM SMD	1500
	LMXS101AN150LTAS Elco (AVX)	FIXED IND 15UH 3.6A 50 MOHM SMD	0
	LMXN2216M2R2BTAS Elco (AVX)	FIXED IND 2.2UH 6 MOHM SMD	0
	L0805120GEWTR Elco (AVX)	FIXED IND 12NH 750MA 200 MOHM	0
	HLQ021R0BTTR Elco (AVX)	FIXED IND 1NH 330MA 100 MOHM SMD	9970
	HLQ026R8HTTR Elco (AVX)	FIXED IND 6.8NH 160MA 600 MOHM	0
	L08055R6BEWTR Elco (AVX)	FIXED IND 5.6NH 750MA 100 MOHM	0
	LMLP06D6N1R3CTAS Elco (AVX)	FIXED IND 1.3UH 4A 16 MOHM SMD	0
	LMLP0707NR10DTAS Elco (AVX)	FIXED INDUCTOR 100NH SMD	1500
	LCCI0603S1N0GTAR Elco (AVX)	FIXED IND 1NH 1A 50 MOHM SMD	0
$L02012R7BHSTR\500$	L02012R7BHSTR\500 Elco (AVX)	FIXED IND 2.7NH 180MA 700 MOHM	3525
	LMXN1915M680CTAS Elco (AVX)	FIXED IND 68UH 130 MOHM SMD	0
	LMLP06C6N3R0CTAS Elco (AVX)	FIXED IND 3UH 3.4A 23 MOHM SMD	0
	LMLP0404N4R7CTAS Elco (AVX)	FIXED IND 4.7UH 750MA 210 MOHM	0
$L02011R2AHSTR\500$	L02011R2AHSTR\500 Elco (AVX)	FIXED IND 1.2NH 300MA 300 MOHM	2185
	HLC022R7BTTR Elco (AVX)	FIXED IND 2.7NH 521MA 250 MOHM	0
	L0805100GEWTR Elco (AVX)	FIXED IND 10NH 750MA 130 MOHM	0
	LMLP13B3M5R6DTAS Elco (AVX)	FIXED IND 5.6UH 12A 12.8MOHM SMD	400
	LCCI0402S4N7GTAR Elco (AVX)	FIXED IND 4.7NH 700MA 200 MOHM	10000

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