Fixed Inductors

Image	Part Number	Description / PDF	Quantity
	LMLP07B7M100DTAS Elco (AVX)	FIXED IND 10UH 3.2A 101MOHM SMD	0
	LMLP04A4N4R7CTAS Elco (AVX)	FIXED IND 4.7UH 960MA 140 MOHM	7910
	LMLP07C7MR82DTAS Elco (AVX)	FIXED IND 820NH 15A 4.9MOHM SMD	800
	LMLP04A4M470CTAS Elco (AVX)	FIXED IND 47UH 370MA 1 OHM SMD	0
	LMLP06D6M680CTAS Elco (AVX)	FIXED IND 68UH 900MA 330 MOHM	0
	L0603150GGSTR Elco (AVX)	FIXED IND 15NH 300MA 600 MOHM	7069
	HLC026R8GTTR Elco (AVX)	FIXED IND 6.8NH 343MA 600 MOHM	0
	AL12A12N5JTR Elco (AVX)	FIXED IND 12.5NH 4A 3.4 MOHM SMD	0
	L08056R5CEWTR Elco (AVX)	FIXED IND 6.5NH 600 MOHM SMD	0
	LMLP06C6M150CTAS Elco (AVX)	FIXED IND 15UH 1.8A 95 MOHM SMD	0
	LMLP05D5N6R8CTAS Elco (AVX)	FIXED IND 6.8UH 2.3A 49MOHM SMD	1492
	LMLP05D5N2R2CTAS Elco (AVX)	FIXED IND 2.2UH 3.5A 22 MOHM SMD	0
	LMLP13B3M1R8DTAS Elco (AVX)	FIXED IND 1.8UH 24A 3.2MOHM SMD	400
	LMLP1313M8R2DTAS Elco (AVX)	FIXED IND 8.2UH 9.5A 22.5 MOHM	495500
	LMLP0707MR56DTAS Elco (AVX)	FIXED IND 560NH 11A 9.3MOHM SMD	15001500
$L08051R8DEWTR\3$	L08051R8DEWTR\3 Elco (AVX)	FIXED IND 1.8NH 1A 60 MOHM SMD	0
	LMLP0405M6R8DTAS Elco (AVX)	FIXED IND 6.8UH 1.5A 175MOHM SMD	1950
	LMXN1915M100CTAS Elco (AVX)	FIXED INDUCTOR 10UH 31 MOHM SMD	192
	LMLP0808N1R4CTAS Elco (AVX)	FIXED IND 1.4UH 7A 7 MOHM SMD	0
	LMLP03B3N1R5CTAR Elco (AVX)	FIXED IND 1.5UH 1.82A 40 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