Fixed Inductors

Part Number	Description / PDF	Quantity
SLF10165T-3R3N5R83PF TDK Corporation	FIXED IND 3.3UH 5.8A 12.5 MOHM	244
VLS252008ET-1R0N-CA TDK Corporation	FIXED IND 1UH 970MA 219 MOHM SMD	0
MHQ1005PR36GT000 TDK Corporation	FIXED IND 360NH 80MA 8.4 OHM SMD	5130
VLS5045EX-470M TDK Corporation	FIXED IND 47UH 1A 390 MOHM SMD	8420
MHQ0603P4N3ST000 TDK Corporation	FIXED IND 4.3NH 400MA 350 MOHM	26131
NLV25T-022J-PFD TDK Corporation	FIXED IND 22NH 420MA 370 MOHM	0
LTF5022T-100M1R3-D TDK Corporation	FIXED IND 10UH 1.51A 160 MOHM	1502
NL453232T-102J-PF TDK Corporation	FIXED IND 1MH 30MA 40 OHM SMD	0
MLF2012A1R2M TDK Corporation	FIXED IND 1.2UH 80MA 350 MOHM	447
VLF403212MT-2R2M-CA TDK Corporation	FIXED IND 2.2UH 2.48A 65 MOHM	164
VLBU6565100T-R20L TDK Corporation	FIXED IND 200NH 70A 0.18 MOHM	736
NLV32T-056J-PFD TDK Corporation	FIXED IND 56NH 450MA 330 MOHM	0
NLCV32T-150K-EFD TDK Corporation	FIXED IND 15UH 370MA 728 MOHM	0
NLCV25T-220K-PF TDK Corporation	FIXED IND 22UH 160MA 3.64 OHM	9150
MLG0603P1N8BT000 TDK Corporation	FIXED IND 1.8NH 700MA 100 MOHM	0
VLS3015T-150MR58 TDK Corporation	FIXED IND 15UH 580MA 422 MOHM	514
MHQ1005P4N3ST TDK Corporation	FIXED IND 4.3NH 800MA 100 MOHM	0
CLF10060NIT-101M-D TDK Corporation	FIXED IND 100UH 1.35A 180 MOHM	1302
MHQ0402PSA1N2ST000 TDK Corporation	FIXED IND 1.2NH 500MA 200 MOHM	0
VLS252012T-6R8MR66 TDK Corporation	FIXED IND 6.8UH 660MA 612 MOHM	15

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