Fixed Inductors

Image	Part Number	Description / PDF	Quantity
	L08054R7CESTR Elco (AVX)	FIXED IND 4.7NH 750MA 100 MOHM	13531
	HLQ021R1BTTR Elco (AVX)	FIXED IND 1.1NH 330MA 100 MOHM	0
	LMLP1313M1R0DTAS Elco (AVX)	FIXED IND 1UH 29A 2.5MOHM SMD	495500
	LMLP03A2N4R7CTAR Elco (AVX)	FIXED IND 4.7UH 980MA 130 MOHM	0
	LMLP06A6M101CTAR Elco (AVX)	FIXED IND 100UH 320MA 2.18 OHM	926
	LMLP07C7M220DTAS Elco (AVX)	FIXED IND 22UH 2.5A 170MOHM SMD	768
	LMLP06D6M470CTAS Elco (AVX)	FIXED IND 47UH 1.1A 220 MOHM SMD	1477
	LMLP05D5N3R3CTAS Elco (AVX)	FIXED IND 3.3UH 3.3A 27 MOHM SMD	0
	HLC022R2BTTR Elco (AVX)	FIXED IND 2.2NH 571MA 200 MOHM	0
	LMLP07A7M1R0DTAS Elco (AVX)	FIXED IND 1UH 11A 10MOHM SMD	537
	LMLP0404M330CTAS Elco (AVX)	FIXED IND 33UH 300MA 1.54 OHM	0
$L08058R2DEWTR\500$	L08058R2DEWTR\500 Elco (AVX)	FIXED IND 8.2NH 750MA 120 MOHM	0
	LMLP0405MR22DTAS Elco (AVX)	FIXED IND 220NH 9A 6.6MOHM SMD	1981
	LMLP06D6M101CTAS Elco (AVX)	FIXED IND 100UH 700MA 500 MOHM	895
	L06031R8CGSTR Elco (AVX)	FIXED IND 1.8NH 1A 70 MOHM SMD	4942
	L06034R7DGWTR Elco (AVX)	FIXED IND 4.7NH 500MA 150 MOHM	0
	L0805150JEWTR Elco (AVX)	FIXED IND 15NH 750MA 200 MOHM	0
	LMLP0808N6R8CTAS Elco (AVX)	FIXED IND 6.8UH 3.7A 25MOHM SMD	995
	LMLP04A4N1R0CTAS Elco (AVX)	FIXED IND 1UH 1.5A 60MOHM SMD	4460
	LMLP07A7M8R2DTAS Elco (AVX)	FIXED IND 8.2UH 4.5A 60MOHM SMD	21933

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