Fixed Inductors

Image	Part Number	Description / PDF	Quantity
	L08054R7CEWTR Elco (AVX)	FIXED IND 4.7NH 750MA 100 MOHM	0
	LMLP06D6M150CTAS Elco (AVX)	FIXED IND 15UH 1.9A 77 MOHM SMD	0
	AL12A08N0JTR Elco (AVX)	FIXED IND 8NH 4A 2.6 MOHM SMD	0
	LMLP0405MR47DTAS Elco (AVX)	FIXED IND 470NH 7A 14MOHM SMD	19252000
$L08053R3BEWTR\500$	L08053R3BEWTR\500 Elco (AVX)	FIXED IND 3.3NH 750MA 110 MOHM	0
	LCCI0201B0N9GTAR Elco (AVX)	FIXED IND 0.9NH 750MA 100 MOHM	0
	LCCI0603J27NGTAR Elco (AVX)	FIXED IND 27NH 600MA 550 MOHM	4000
	LMLP07B7MR68DTAS Elco (AVX)	FIXED IND 680NH 13A 7.2MOHM SMD	1500
	LCCI0603J47NGTAR Elco (AVX)	FIXED IND 47NH 500MA 700 MOHM	4000
	L08051R2CEWTR Elco (AVX)	FIXED IND 1.2NH 1A 50 MOHM SMD	0
	LMLP06C6N4R7CTAS Elco (AVX)	FIXED IND 4.7UH 3A 31MOHM SMD	1928
	LMLP0808N0R9CTAS Elco (AVX)	FIXED IND 900NH 7.8A 6 MOHM SMD	0
	LMLP13B3M6R8DTAS Elco (AVX)	FIXED IND 6.8UH 11.5A 14MOHM SMD	400
	LCCI0201S2N7GTAR Elco (AVX)	FIXED IND 2.7NH 450MA 250 MOHM	0
$L0201R33AHSTR\500$	L0201R33AHSTR\500 Elco (AVX)	FIXED IND 0.33NH 550MA 100 MOHM	5000
	L04023R9BHNTR Elco (AVX)	FIXED IND 3.9NH 250MA 450 MOHM	956
	L06031R8DGWTR Elco (AVX)	FIXED IND 1.8NH 1A 70 MOHM SMD	0
	L04021R5BHNTR Elco (AVX)	FIXED IND 1.5NH 400MA 200 MOHM	0
	LMLP05D5M330CTAS Elco (AVX)	FIXED IND 33UH 1.2A 180 MOHM SMD	0
	LMLP13B3M8R2DTAS Elco (AVX)	FIXED IND 8.2UH 10.5A 15.5MOHM	396

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