Fixed Inductors

Part Number	Description / PDF	Quantity
NLCV32T-101K-PFD TDK Corporation	FIXED IND 100UH 120MA 4.81 OHM	0
NLV32T-022J-PF TDK Corporation	FIXED IND 22NH 450MA 200 MOHM	1221
MLG1005S1N0ST000 TDK Corporation	FIXED IND 1NH 1A 100 MOHM SMD	11905
SPM10040T-1R0M TDK Corporation	FIXED IND 1UH 15A 4.2 MOHM SMD	1212
MHQ0603P4N2ST000 TDK Corporation	FIXED IND 4.2NH 400MA 350 MOHM	0
VLP5610T-220MR45 TDK Corporation	FIXED IND 22UH 450MA 960 MOHM	3867
MLG0402Q2N7ST000 TDK Corporation	FIXED IND 2.7NH 200MA 800 MOHM	0
TFM201610ALM-R47MTAA TDK Corporation	FIXED IND 470NH 4.5A 34 MOHM	6818
VLS3015T-6R8MR86 TDK Corporation	FIXED IND 6.8UH 860MA 211 MOHM	2943
CLF10060NIT-330M-D TDK Corporation	FIXED IND 33UH 2.15A 73.2 MOHM	0
NLV25T-1R0J-EFD TDK Corporation	FIXED IND 1UH 245MA 1.1 OHM SMD	1687
MLG1005S0N5BTD25 TDK Corporation	FIXED IND 0.5NH 1A 100 MOHM SMD	5465
VLS5045EX-100M-H TDK Corporation	FIXED IND 10UH 2.5A 79.3 MOHM	5962
NLV32T-018J-EF TDK Corporation	FIXED IND 18NH 450MA 180 MOHM	1359
MHQ0402PSA4N2BT000 TDK Corporation	FIXED IND 4.2NH 200MA 800 MOHM	15337
MLF1608DR27JTD25 TDK Corporation	FIXED IND 270NH 150MA 600 MOHM	1147
MLP2520S3R3ST0S1 TDK Corporation	FIXED IND 3.3UH 1A 143 MOHM SMD	689
MLG0402Q22NHT000 TDK Corporation	FIXED IND 22NH 130MA 3.2 OHM SMD	0
CLF10040T-471M-CA TDK Corporation	FIXED IND 470UH 440MA 1.452 OHM	505
VLF504010MT-3R3M-CA TDK Corporation	FIXED IND 3.3UH 2.1A 91 MOHM SMD	874

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