Fixed Inductors

Part Number	Description / PDF	Quantity
CLF7045T-330M-D TDK Corporation	FIXED IND 33UH 1.4A 132 MOHM SMD	85
NLCV32T-2R2M-EFD TDK Corporation	FIXED IND 2.2UH 770MA 169 MOHM	603
MLG1005S24NJTD25 TDK Corporation	FIXED IND 24NH 350MA 700 MOHM	21636
MLK1005S2N4ST000 TDK Corporation	FIXED IND 2.4NH 500MA 200 MOHM	12288
NLV32T-R33J-EFD TDK Corporation	FIXED IND 330NH 450MA 400 MOHM	3867
MLP2520WR68MT0S1 TDK Corporation	FIXED IND 680NH 2.8A 52 MOHM SMD	0
MLG0603S3N3STD25 TDK Corporation	FIXED IND 3.3NH 300MA 350 MOHM	0
MLG0603P5N6JTD25 TDK Corporation	FIXED IND 5.6NH 350MA 400 MOHM	0
CLF7045NIT-150M-D TDK Corporation	FIXED IND 15UH 2.3A 66 MOHM SMD	1122
MLG0402P0N8CT000 TDK Corporation	FIXED IND 0.8NH 320MA 400 MOHM	0
VLF403215MT-4R7M-CA TDK Corporation	FIXED IND 4.7UH 2.13A 87 MOHM	0
MLG1005S1N8CTD25 TDK Corporation	FIXED IND 1.8NH 900MA 150 MOHM	4655
VLCF5020T-4R7N1R7-1 TDK Corporation	FIXED IND 4.7UH 1.7A 122 MOHM	237
MLG0603S51NJT000 TDK Corporation	FIXED IND 51NH 50MA 2.8 OHM SMD	13403
MLG0603S0N8CT000 TDK Corporation	FIXED IND 0.8NH 600MA 100 MOHM	0
NLCV25T-R10M-PFR TDK Corporation	FIXED IND 100NH 1.89A 48 MOHM	862
NLV32T-R47J-PFD TDK Corporation	FIXED IND 470NH 450MA 500 MOHM	0
MLG0603S33NHTD25 TDK Corporation	FIXED IND 33NH 100MA 1.8 OHM SMD	0
MHQ0603P4N1BTD25 TDK Corporation	FIXED IND 4.1NH 400MA 350 MOHM	4000
CLF10040T-330M-CA TDK Corporation	FIXED IND 33UH 1.7A 96 MOHM SMD	595

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