Fixed Inductors

Part Number	Description / PDF	Quantity
SPM5012T-3R3M-LR TDK Corporation	FIXED IND 3.3UH 2.5A 110 MOHM	834
MLG0603P6N2JT000 TDK Corporation	FIXED IND 6.2NH 300MA 700 MOHM	0
MLF1608E5R6MTD25 TDK Corporation	FIXED IND 5.6UH 15MA 1.1 OHM SMD	0
LTF4022T-3R3N-D TDK Corporation	FIXED IND 3.3UH 2.1A 64 MOHM SMD	249
NLCV25T-R10M-EFRD TDK Corporation	FIXED IND 100NH 1.89A 48 MOHM	1900
MLG0603P3N8CTD25 TDK Corporation	FIXED IND 3.8NH 400MA 300 MOHM	0
MHQ1005P2N7BTD25 TDK Corporation	FIXED IND 2.7NH 900MA 70 MOHM	0
MLF2012DR12JT000 TDK Corporation	FIXED IND 120NH 300MA 200 MOHM	3320
MLF1005L1R2KT000 TDK Corporation	FIXED IND 1.2UH 35MA 790 MOHM	20709
NL453232T-180J-PF TDK Corporation	FIXED IND 18UH 190MA 2.8 OHM SMD	1242
MLP2016H3R3MT0S1 TDK Corporation	FIXED IND 3.3UH 1.2A 150 MOHM	6018
MLG0402P1N5ST000 TDK Corporation	FIXED IND 1.5NH 220MA 600 MOHM	0
MLG0603S11NJTD25 TDK Corporation	FIXED IND 11NH 200MA 800 MOHM	0
MLZ2012M1R0HT000 TDK Corporation	FIXED IND 1UH 800MA 100 MOHM SMD	34897
CLF12577NIT-3R3N-D TDK Corporation	FIXED IND 3.3UH 9.5A 10.01 MOHM	92
CLF10040T-151M-CA TDK Corporation	FIXED IND 150UH 800MA 456 MOHM	587
VLCF4024T-100MR90-2 TDK Corporation	FIXED IND 10UH 900MA 136 MOHM	2955
MLP2016V1R0MT0S1 TDK Corporation	FIXED IND 1UH 1.2A 150 MOHM SMD	4016
NLCV32T-R15M-PFR TDK Corporation	FIXED IND 150NH 2.6A 28.8 MOHM	4423
NLFV25T-4R7M-EF TDK Corporation	FIXED IND 4.7UH 210MA 290 MOHM	1960

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