Fixed Inductors

Part Number	Description / PDF	Quantity
LK16083R9M-T TAIYO YUDEN	FIXED IND 3.9UH 30MA 1.5 OHM SMD	0
NRS5030T2R2NMGJ TAIYO YUDEN	FIXED IND 2.2UH 3.5A 23 MOHM SMD	407
HK100533NJ-T TAIYO YUDEN	FIXED IND 33NH 250MA 800 MOHM	75175
LBC3225T6R8MR TAIYO YUDEN	FIXED IND 6.8UH 620MA 120 MOHM	4945
NS12565T7R0NNV TAIYO YUDEN	FIXED IND 7UH 5.21A 19.5MOHM SMD	0
NRH2410T1R0NN4 TAIYO YUDEN	FIXED IND 1UH 1.41A 84 MOHM SMD	1855
LK212568NM-T TAIYO YUDEN	FIXED IND 68NH 300MA 150 MOHM	0
NRH3012TR47NNV TAIYO YUDEN	FIXED IND 470NH 1.9A 39.6 MOHM	42
HK100527NJ-TV TAIYO YUDEN	FIXED IND 27NH 300MA 700 MOHM	2037
NRS5020T6R8MMGJ TAIYO YUDEN	FIXED IND 6.8UH 1.65A 108 MOHM	6643
LB2518T680M TAIYO YUDEN	FIXED IND 68UH 70MA 1.5 OHM SMD	0
CB2016T1R5M TAIYO YUDEN	FIXED IND 1.5UH 1A 143 MOHM SMD	1890
MDMK4040T2R2MM TAIYO YUDEN	FIXED IND 2.2UH 2.8A 79 MOHM SMD	0
NR3010T2R2M TAIYO YUDEN	FIXED IND 2.2UH 1.1A 114 MOHM	1794
LBC2518T680M TAIYO YUDEN	FIXED IND 68UH 140MA 2.8 OHM SMD	0
NS10155T6R8NNA TAIYO YUDEN	FIXED IND 6.8UH 4.98A 19.2 MOHM	1793
LK2125R15K-T TAIYO YUDEN	FIXED IND 150NH 270MA 200 MOHM	0
HK06032N2S-T TAIYO YUDEN	FIXED IND 2.2NH 360MA 190 MOHM	6235
HK100533NJ-TV TAIYO YUDEN	FIXED IND 33NH 200MA 800 MOHM	19905
MCEE1005T1R0MHN TAIYO YUDEN	FIXED IND 1UH 800MA 300 MOHM SMD	16890

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