Fixed Inductors

Image	Part Number	Description / PDF	Quantity
	L02011R8BHSTR Elco (AVX)	FIXED INDUCTOR	25000
	L0201R68AHSTR Elco (AVX)	FIXED INDUCTOR	0
	L02012R7BHSTR Elco (AVX)	FIXED INDUCTOR	0
	L0201R82AHSTR Elco (AVX)	FIXED INDUCTOR	0
	L02013R3BHSTR Elco (AVX)	FIXED INDUCTOR	0
	AL01668N0JTS Elco (AVX)	FIXED INDUCTOR	0
	L06031R2BGWTR Elco (AVX)	FIXED IND 1.2NH 1A 40 MOHM SMD	11853
	L06035R6CFWTR Elco (AVX)	FIXED IND 5.6NH 300MA 250 MOHM	0
	L0603100GFWTR Elco (AVX)	FIXED IND 10NH 300MA 450 MOHM	0
$L0805120JEWTR\3$	L0805120JEWTR\3 Elco (AVX)	FIXED IND 12NH 750MA 200 MOHM	0
$L08053R9DEWTR\3$	L08053R9DEWTR\3 Elco (AVX)	FIXED IND 3.9NH 750MA 200 MOHM	0
$L08056R5DEWTR\3$	L08056R5DEWTR\3 Elco (AVX)	FIXED IND 6.5NH 600 MOHM SMD	0
	L06034R7DFWTR Elco (AVX)	FIXED IND 4.7NH 500MA 150 MOHM	0
	L06038R2DFWTR Elco (AVX)	FIXED IND 8.2NH 300MA 350 MOHM	0
	L0603100FHLTR Elco (AVX)	FIXED IND 10NH 300MA 450 MOHM	0
	L06031R5CFWTR Elco (AVX)	FIXED IND 1.5NH 1A 60 MOHM SMD	0
	L04021R8BHLTR Elco (AVX)	FIXED IND 1.8NH 400MA 200 MOHM	0
	L06038R2BHLTR Elco (AVX)	FIXED IND 8.2NH 300MA 350 MOHM	0
$L08055R6DEWTR\3$	L08055R6DEWTR\3 Elco (AVX)	FIXED IND 5.6NH 750MA 100 MOHM	0
	L0603R68AHLTR Elco (AVX)	FIXED IND 0.68NH 700MA 20 MOHM	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