Fixed Inductors

Part Number	Description / PDF	Quantity
MLG0603S30NHT000 TDK Corporation	FIXED IND 30NH 100MA 1.6 OHM SMD	0
MHQ1005P15NGTD25 TDK Corporation	FIXED IND 15NH 400MA 280 MOHM	0
MLG1005S24NHT000 TDK Corporation	FIXED IND 24NH 350MA 700 MOHM	0
VLS3010ET-220M-CA TDK Corporation	FIXED IND 22UH 600MA 900 MOHM	1891
NLV25T-270J-EFD TDK Corporation	FIXED IND 27UH 115MA 6.3 OHM SMD	456
VLS252010HBU-6R8M TDK Corporation	FIXED IND 6.8UH 720MA 540 MOHM	7278
MHQ1005P18NGTD25 TDK Corporation	FIXED IND 18NH 260MA 800 MOHM	0
SPM4010T-2R2M-LR TDK Corporation	FIXED IND 2.2UH 2.6A 116.6 MOHM	1898
SLF12575T-100M5R4-PF TDK Corporation	FIXED IND 10UH 5.4A 18.7 MOHM	827
MLZ1608N1R0LT000 TDK Corporation	FIXED IND 1UH 700MA 110 MOHM SMD	616
MHQ1005P9N1GTD25 TDK Corporation	FIXED IND 9.1NH 550MA 170 MOHM	0
MHQ1005P19NGTD25 TDK Corporation	FIXED IND 19NH 260MA 800 MOHM	0
VLM10555T-2R5M8R0-2 TDK Corporation	FIXED IND 2.5UH 8A 7.71 MOHM SMD	500
MLF1005LR68KT000 TDK Corporation	FIXED IND 680NH 40MA 550 MOHM	16343
SLF10165T-3R3N5R8-3PF TDK Corporation	FIXED IND 3.3UH 5.8A 12.5 MOHM	0
MHQ0402PSA3N4CT000 TDK Corporation	FIXED IND 3.4NH 200MA 650 MOHM	0
MLG1005S0N9BTD25 TDK Corporation	FIXED IND 0.9NH 1A 100 MOHM SMD	13143
CLF6045T-150M-H TDK Corporation	FIXED IND 15UH 2A 55 MOHM SMD	750
MLG0603P1N5CTD25 TDK Corporation	FIXED IND 1.5NH 800MA 100 MOHM	10770
VLCF4028T-2R7N1R8-2 TDK Corporation	FIXED IND 2.7UH 1.89A 49 MOHM	939

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