Fixed Inductors

Part Number	Description / PDF	Quantity
MLK0603L2N2ST000 TDK Corporation	FIXED IND 2.2NH 300MA 300 MOHM	2422
MLG0603P75NHTD25 TDK Corporation	FIXED IND 75NH 80MA 4 OHM SMD	0
VLS3010ET-6R8M TDK Corporation	FIXED IND 6.8UH 690MA 312 MOHM	399
SPM6545VT-100M-D TDK Corporation	FIXED IND 10UH 4.3A 52.3MOHM SMD	1175
MLG0603P6N2STD25 TDK Corporation	FIXED IND 6.2NH 300MA 700 MOHM	0
MLF2012E120KTD25 TDK Corporation	FIXED IND 12UH 15MA 900 MOHM SMD	775
MLG0603P3N3CTD25 TDK Corporation	FIXED IND 3.3NH 450MA 200 MOHM	14328
MLP2520V1R0MT TDK Corporation	FIXED IND 1UH 1.3A 130 MOHM SMD	0
NLCV25T-3R3M-PF TDK Corporation	FIXED IND 3.3UH 340MA 845 MOHM	10636
VLF252015MT-150M-CA TDK Corporation	FIXED IND 15UH 770MA 450 MOHM	0
VLF252015MT-R47N TDK Corporation	FIXED IND 470NH 4.03A 16 MOHM	0
TFM322512ALVA3R3MTAA TDK Corporation	FIXED IND 3.3UH 2.3A 113 MOHM	3825
VLCF5020T-1R8N2R0 TDK Corporation	FIXED IND 1.8UH 2.07A 59 MOHM	3011
MLK0603L1N3ST000 TDK Corporation	FIXED IND 1.3NH 300MA 240 MOHM	24359
MLG0603P4N2CT000 TDK Corporation	FIXED IND 4.2NH 350MA 400 MOHM	0
MHQ1005P4N3CTD25 TDK Corporation	FIXED IND 4.3NH 800MA 100 MOHM	0
VLS201612HBX-100M-1 TDK Corporation	FIXED IND 10UH 760MA 756 MOHM	0
NLV32T-2R7J-PF TDK Corporation	FIXED IND 2.7UH 290MA 1.1 OHM	1576
MLF2012A3R9KT000 TDK Corporation	FIXED IND 3.9UH 30MA 650 MOHM	1289
VLCF5028T-470MR49-2 TDK Corporation	FIXED IND 47UH 490MA 330 MOHM	7270

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