Fixed Inductors

Part Number	Description / PDF	Quantity
VLS252012ET-100M TDK Corporation	FIXED IND 10UH 590MA 756 MOHM	152061
SLF7045T-151MR50-H TDK Corporation	FIXED IND 150UH 500MA 660 MOHM	1773
MHQ1005P30NGT000 TDK Corporation	FIXED IND 30NH 220MA 1.3 OHM SMD	0
MLG0402Q2N5ST000 TDK Corporation	FIXED IND 2.5NH 200MA 800 MOHM	323314
MLP2016V2R2MT TDK Corporation	FIXED IND 2.2UH 1A 212.5 MOHM	0
VLP4612T-2R5M1R1 TDK Corporation	FIXED IND 2.5UH 1.1A 170 MOHM	8544
MLG1005S4N3CT000 TDK Corporation	FIXED IND 4.3NH 700MA 200 MOHM	0
MLG0603SR10HT000 TDK Corporation	FIXED IND 100NH 50MA 4.5 OHM SMD	0
SPM3015T-1R5M TDK Corporation	FIXED IND 1.5UH 3A 73.1 MOHM SMD	1415
NLFV25T-3R3M-EF TDK Corporation	FIXED IND 3.3UH 280MA 240 MOHM	482
MLP2012R1R0MT0S1 TDK Corporation	FIXED IND 1UH 500MA 689 MOHM SMD	0
MLG0603S33NHT000 TDK Corporation	FIXED IND 33NH 100MA 1.8 OHM SMD	0
NLV32T-6R8J-EF TDK Corporation	FIXED IND 6.8UH 180MA 1.8 OHM	2811
SPM5020T-6R8M-CA02 TDK Corporation	FIXED IND 6.8UH 2.8A 118.5 MOHM	0
NLV25T-1R8J-EF TDK Corporation	FIXED IND 1.8UH 210MA 1.45 OHM	73
NLV32T-R10J-EFD TDK Corporation	FIXED IND 100NH 450MA 440 MOHM	950
MHQ0402PSA1N0CT000 TDK Corporation	FIXED IND 1NH 600MA 150 MOHM	0
VLF302512MT-2R2M TDK Corporation	FIXED IND 2.2UH 1.95A 66 MOHM	0
SLF12555T-331MR59-PF TDK Corporation	FIXED IND 330UH 1A 492 MOHM SMD	500
VLF252015MT-6R8M TDK Corporation	FIXED IND 6.8UH 1.14A 190 MOHM	0

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