Fixed Inductors

Part Number	Description / PDF	Quantity
NRS3015T6R8MNGHV TAIYO YUDEN	FIXED IND 6.8UH 880MA 192 MOHM	0
HK1608R10K-T TAIYO YUDEN	FIXED IND 100NH 300MA 100 MOHM	0
LBC3225T470KR TAIYO YUDEN	FIXED IND 47UH 220MA 670 MOHM	138
BRC2518T101M TAIYO YUDEN	FIXED IND 100UH 190MA 3.6 OHM	0
HK10054N7J-T TAIYO YUDEN	FIXED IND 4.7NH 500MA 210 MOHM	0
HKQ0603W0N7B-T TAIYO YUDEN	FIXED IND 0.7NH 850MA 70 MOHM	14765
MDMK2020T4R7MM TAIYO YUDEN	FIXED IND 4.7UH 950MA 242 MOHM	0
MDMK2020T1R5MM TAIYO YUDEN	FIXED IND 1.5UH 1.65A 86 MOHM	433
CBC3225T150MRV TAIYO YUDEN	FIXED IND 15UH 590MA 253.5 MOHM	0
LBC2012T1R0M TAIYO YUDEN	FIXED IND 1UH 620MA 190 MOHM SMD	836
LBM2016T3R9J TAIYO YUDEN	FIXED IND 3.9UH 275MA 740 MOHM	566
NRH3010T1R5NN TAIYO YUDEN	FIXED IND 1.5UH 1.37A 90 MOHM	2000
NRH3012T100MNV TAIYO YUDEN	FIXED IND 10UH 720MA 324 MOHM	1853
MCKK2012T1R0M TAIYO YUDEN	FIXED IND 1UH 2.4A 90 MOHM SMD	6108
CBC3225T470MR TAIYO YUDEN	FIXED IND 47UH 480MA 871 MOHM	56483
MEKK2520T1R0M TAIYO YUDEN	FIXED IND 1UH 3.3A 53 MOHM SMD	7102
LK16082R2K-T TAIYO YUDEN	FIXED IND 2.2UH 30MA 1 OHM SMD	4000
NRS4018T1R5NDGJ TAIYO YUDEN	FIXED IND 1.5UH 2.4A 44.4 MOHM	0
LK10051R2K-T TAIYO YUDEN	FIXED IND 1.2UH 20MA 790 MOHM	0
HK10058N2J-TV TAIYO YUDEN	FIXED IND 8.2NH 300MA 280 MOHM	0

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