Fixed Inductors

Image	Part Number	Description / PDF	Quantity
	HLQ025R6BTTR Elco (AVX)	FIXED IND 5.6NH 170MA 500 MOHM	0
	LMLP03B3N6R8CTAR Elco (AVX)	FIXED IND 6.8UH 880MA 160 MOHM	0
	LCCI0402S3N9GTAR Elco (AVX)	FIXED IND 3.9NH 700MA 200 MOHM	0
	L0603120GGSTR Elco (AVX)	FIXED IND 12NH 300MA 500 MOHM	2825
	LMLP05B5M100CTAR Elco (AVX)	FIXED IND 10UH 1.45A 120 MOHM	0
	LMLP0506M100DTAS Elco (AVX)	FIXED IND 10UH 2.5A 125MOHM SMD	1847
	LCCI0201S1N3GTAR Elco (AVX)	FIXED IND 1.3NH 600MA 140 MOHM	15000
	LMLP1313M1R5DTAS Elco (AVX)	FIXED IND 1.5UH 23A 4.1MOHM SMD	500500
	L08053R3CEWTR Elco (AVX)	FIXED IND 3.3NH 750MA 110 MOHM	0
	LMLP1313MR82DTAS Elco (AVX)	FIXED IND 820NH 31A 2.3MOHM SMD	500
	LMLP0707MR47DTAS Elco (AVX)	FIXED IND 470NH 11.7A 8.3 MOHM	1475
	LMLP05A6M1R0DTAS Elco (AVX)	FIXED IND 1UH 7A 20MOHM SMD	30003000
	LMXS131JM680FTAS Elco (AVX)	FIXED IND 68UH 2A 94 MOHM SMD	225
	LMLP05A6MR33DTAS Elco (AVX)	FIXED IND 330NH 12A 7.3MOHM SMD	3000
	LMLP07A7MR56DTAS Elco (AVX)	FIXED IND 560NH 16.5A 5MOHM SMD	997
	HLC022R4BTTR Elco (AVX)	FIXED IND 2.4NH 549MA 200 MOHM	0
	L04022R2BHNTR Elco (AVX)	FIXED IND 2.2NH 400MA 200 MOHM	12751
	LMLP03B3M470CTAR Elco (AVX)	FIXED IND 47UH 300MA 1.34 OHM	0
	LMLP13B3MR10DTAS Elco (AVX)	FIXED IND 100NH 60A 500UOHM SMD	400
$L0201R82AHSTR\500$	L0201R82AHSTR\500 Elco (AVX)	FIXED IND 0.82NH 400MA 200 MOHM	3000

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