Fixed Inductors

Image	Part Number	Description / PDF	Quantity
	HLQ021R3BTTR Elco (AVX)	FIXED IND 1.3NH 330MA 130 MOHM	0
	LMLP06C6M470CTAS Elco (AVX)	FIXED IND 47UH 920MA 300MOHM SMD	1907
	LMLP03A2N1R5CTAR Elco (AVX)	FIXED IND 1.5UH 1.4A 60 MOHM SMD	0
$L0805120GEWTR\OR$	L0805120GEWTR\OR Elco (AVX)	FIXED IND 12NH 750MA 200 MOHM	0
	HL021R0BTTR Elco (AVX)	FIXED IND 1NH 346MA 95 MOHM SMD	0
	HLQ024R7BTTR Elco (AVX)	FIXED IND 4.7NH 195MA 480 MOHM	0
	LMXN1310M4R7CTAS Elco (AVX)	FIXED IND 4.7UH 36 MOHM SMD	924
	HL022R4BTTR Elco (AVX)	FIXED IND 2.4NH 330MA 192 MOHM	4900
	LMLP06D6M330CTAS Elco (AVX)	FIXED IND 33UH 1.4A 145 MOHM SMD	0
	LMLP06A6M150CTAR Elco (AVX)	FIXED IND 15UH 790MA 330 MOHM	0
	LMLP07C7MR68DTAS Elco (AVX)	FIXED IND 680NH 18A 4.5MOHM SMD	800
	L04022R7AHN Elco (AVX)	FIXED IND 2.7NH 250MA 250 MOHM	0
$L08054R7DEWTR\500$	L08054R7DEWTR\500 Elco (AVX)	FIXED IND 4.7NH 750MA 100 MOHM	0
	LMLP05B5N6R8CTAR Elco (AVX)	FIXED IND 6.8UH 1.65A 90 MOHM	0
	LMLP07C7M3R3DTAS Elco (AVX)	FIXED IND 3.3UH 8A 20.9MOHM SMD	772
$L0805150JEWTR\O$	L0805150JEWTR\O Elco (AVX)	FIXED IND 15NH 750MA 200 MOHM	0
	LMLP07B7M5R6DTAS Elco (AVX)	FIXED IND 5.6UH 5A 62MOHM SMD	1497
	LMLP04B4M101CTAS Elco (AVX)	FIXED IND 100UH 270MA 1.5 OHM	0
	HL02180GTTR Elco (AVX)	FIXED IND 18NH 190MA 1.213 OHM	0
	HL021R6BTTR Elco (AVX)	FIXED IND 1.6NH 339MA 137 MOHM	9310

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