Fixed Inductors

Image	Part Number	Description / PDF	Quantity
	LMLP06B6N4R7CTAS Elco (AVX)	FIXED IND 4.7UH 2A 58MOHM SMD	2490
	LMLP05B5N1R5CTAR Elco (AVX)	FIXED IND 1.5UH 3.2A 26 MOHM SMD	0
	LMLP03A2M220CTAR Elco (AVX)	FIXED IND 22UH 420MA 630MOHM SMD	2000
	LMLP1313M5R6DTAS Elco (AVX)	FIXED IND 5.6UH 11.5A 16.5MOHM	493
	LMLP1313MR22DTAS Elco (AVX)	FIXED IND 220NH 51A 800UOHM SMD	500
$L02011R8BHSTR\500$	L02011R8BHSTR\500 Elco (AVX)	FIXED IND 1.8NH 250MA 500 MOHM	6259
	LMLP13B3MR82DTAS Elco (AVX)	FIXED IND 820NH 33A 1.9MOHM SMD	400
	LMLP0808N4R7CTAS Elco (AVX)	FIXED IND 4.7UH 4.1A 18MOHM SMD	790
	L06032R7DGWTR Elco (AVX)	FIXED IND 2.7NH 750MA 80 MOHM	0
	L08056R8DEWTR Elco (AVX)	FIXED IND 6.8NH 750MA 110 MOHM	0
	LCCI0201J10NGTAR Elco (AVX)	FIXED IND 10NH 250MA 650 MOHM	15000
	L04021R8BHNTR Elco (AVX)	FIXED IND 1.8NH 400MA 200 MOHM	1449
	LMLP1011M6R8DTAS Elco (AVX)	FIXED IND 6.8UH 6.5A 25MOHM SMD	488500
	HLQ02220HTTR Elco (AVX)	FIXED IND 22NH 95MA 1.9 OHM SMD	0
	LMLP06D6N3R0CTAS Elco (AVX)	FIXED IND 3UH 3.2A 24 MOHM SMD	0
	LCCI0201B0N5GTAR Elco (AVX)	FIXED IND 0.5NH 800MA 80 MOHM	15000
	L08051R8CEWTR Elco (AVX)	FIXED IND 1.8NH 1A 60 MOHM SMD	0
	LCCI0402J56NGTAR Elco (AVX)	FIXED IND 56NH 200MA 1.1 OHM SMD	0
	L0603120JGWTR Elco (AVX)	FIXED IND 12NH 300MA 500 MOHM	0
	LMLP07A7M100DTAS Elco (AVX)	FIXED IND 10UH 4A 68MOHM SMD	635

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