Fixed Inductors

Part Number	Description / PDF	Quantity
NLCV32T-R47M-EFR TDK Corporation	FIXED IND 470NH 2A 45.6 MOHM SMD	0
NLV32T-220J-PF TDK Corporation	FIXED IND 22UH 110MA 3.7 OHM SMD	3685
MLF1005G1R0JT000 TDK Corporation	FIXED IND 1UH 40MA 640 MOHM SMD	7508
MHQ1005P5N1BT000 TDK Corporation	FIXED IND 5.1NH 800MA 120 MOHM	0
MHQ0603P3N0ST000 TDK Corporation	FIXED IND 3NH 450MA 300 MOHM SMD	0
CLF10060NIT-1R5N-D TDK Corporation	FIXED IND 1.5UH 9.3A 8.06 MOHM	207
MLG1005S1N2CT000 TDK Corporation	FIXED IND 1.2NH 1A 100 MOHM SMD	14221
NLCV32T-1R5M-PF TDK Corporation	FIXED IND 1.5UH 830MA 143 MOHM	17907
NLFV25T-100K-PF TDK Corporation	FIXED IND 10UH 155MA 432 MOHM	107869
VLS4012CX-2R2M-1 TDK Corporation	FIXED IND 2.2UH 2.56A 74 MOHM	1878
NLV25T-3R3J-PFD TDK Corporation	FIXED IND 3.3UH 185MA 1.9 OHM	0
MLG0603P9N1JT000 TDK Corporation	FIXED IND 9.1NH 250MA 900 MOHM	5780
MLF2012DR39KTD25 TDK Corporation	FIXED IND 390NH 200MA 450 MOHM	6022
VLS252010HBX-R24M-1 TDK Corporation	FIXED IND 240NH 3.91A 29 MOHM	2853
VLCF5020T-3R3N1R6 TDK Corporation	FIXED IND 3.3UH 1.6A 83 MOHM SMD	609
MLG0603SR12HT000 TDK Corporation	FIXED IND 120NH 50MA 7 OHM SMD	0
MHQ0402PSA2N4BT000 TDK Corporation	FIXED IND 2.4NH 300MA 400 MOHM	18389
SPM3010T-2R2M-LR TDK Corporation	FIXED IND 2.2UH 2A 166 MOHM SMD	3683
TPL1254035-712J-708N TDK Corporation	FIXED IND 7.08MH 45 OHM SMD	0
VLS3010ET-6R8M-CA TDK Corporation	FIXED IND 6.8UH 1A 312 MOHM SMD	1360

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