Fixed Inductors

Part Number	Description / PDF	Quantity
AIML-1206-1R2K-T Abracon	FIXED IND 1.2UH 100MA 400 MOHM	0
0805CT-1N8EJTS Delta Electronics	FIXED IND 1.8NH 800MA 30 MOHM	11478
VLS3015ET-470M TDK Corporation	FIXED IND 47UH 320MA 1.5 OHM SMD	3477
UP2-4R7-R PowerStor (Eaton)	FIXED IND 4.7UH 5.7A 17.3 MOHM	0
L0806B4R7JSWST KEMET	FIXED IND 4.7UH 270MA 780 MOHM	1847
CDC5D23BNP-100LC Sumida Corporation	FIXED IND 10UH 1.04A 133 MOHM	3975
ELC-18E222L Panasonic	FIXED IND 2.2MH 730MA 630 MOHM	0
CD54NP-181KC Sumida Corporation	FIXED IND 180UH 380MA 1.38 OHM	0
PA4319.332NLT PulseLarsen Antenna	FIXED IND 3.3UH 3.28A 18 MOHM	0
P0762.683NLT PulseLarsen Antenna	FIXED IND 68UH 700MA 660 MOHM	0
26S220C Murata Power Solutions	FIXED IND 22UH 2.2A 70 MOHM SMD	256
MLG1005S13NHT000 TDK Corporation	FIXED IND 13NH 400MA 500 MOHM	0
MPL-AY1050-R47 MPS (Monolithic Power Systems)	FIXED IND 470NH 25A 1.25 MOHM	500
7447840068 Würth Elektronik Midcom	FIXED IND 6.8NH 300MA 290 MOHM	7597
BSCH001608081N0S00 Chilisin Electronics	FIXED IND 1NH 600MA 100MOHM SMD	6571
ELC-3GN330M Panasonic	FIXED IND 33UH 280MA 1.4 OHM SMD	5817
WCL3225-270-R PowerStor (Eaton)	FIXED IND 27UH 180MA 2.7 OHM SMD	0
MGV0402100M-10 Laird - Performance Materials	FIXED IND 10UH 1.8A 243MOHM SMD	0
SPM6550T-1R5M-HZ TDK Corporation	FIXED IND 1.5UH 17.1A 6.49 MOHM	1324
NLFV32T-102K-EF TDK Corporation	FIXED IND 1MH 20MA 27 OHM SMD	5627

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