Fixed Inductors

Part Number	Description / PDF	Quantity
NLV32T-680J-PFD TDK Corporation	FIXED IND 68UH 50MA 9 OHM SMD	0
VLS5045EX-101M-CA TDK Corporation	FIXED IND 100UH 700MA 754 MOHM	147
MLF2012E6R8MT000 TDK Corporation	FIXED IND 6.8UH 15MA 650 MOHM	0
MLZ2012N3R3LT000 TDK Corporation	FIXED IND 3.3UH 750MA 150 MOHM	18618
NLV25T-018J-PFD TDK Corporation	FIXED IND 18NH 450MA 310 MOHM	0
SLF10165T-2R2N6R3-3PF TDK Corporation	FIXED IND 2.2UH 6.3A 10.9 MOHM	0
MHQ1005P24NGTD25 TDK Corporation	FIXED IND 24NH 230MA 1.2 OHM SMD	0
MHQ1005P56NGTD25 TDK Corporation	FIXED IND 56NH 180MA 1.8 OHM SMD	0
VLF403215MT-1R5N-CA TDK Corporation	FIXED IND 1.5UH 3.38A 36 MOHM	960
NLCV25T-330K-PFD TDK Corporation	FIXED IND 33UH 120MA 5.46 OHM	0
MHQ0402PSA3N5ST000 TDK Corporation	FIXED IND 3.5NH 200MA 650 MOHM	0
MLJ1608WR16KT000 TDK Corporation	FIXED IND 160NH 700MA 156 MOHM	3690
VLF403215MT-6R8M-CA TDK Corporation	FIXED IND 6.8UH 1.68A 130 MOHM	1885
MLG0402P10NHT000 TDK Corporation	FIXED IND 10NH 140MA 2.1 OHM SMD	0
LGJ12565TS-101M1R6-H TDK Corporation	FIXED IND 100UH 1.9A 123 MOHM	495
MHQ0603P2N6BTD25 TDK Corporation	FIXED IND 2.6NH 500MA 250 MOHM	4007
MLG0402Q2N8ST000 TDK Corporation	FIXED IND 2.8NH 200MA 800 MOHM	0
CLF10040T-1R0N-D TDK Corporation	FIXED IND 1UH 6.3A 5.7 MOHM SMD	1103
VLF504010MT-R68N-CA TDK Corporation	FIXED IND 680NH 3.71A 30 MOHM	870
MHQ0402PSA3N3ST000 TDK Corporation	FIXED IND 3.3NH 250MA 650 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