Fixed Inductors

Part Number	Description / PDF	Quantity
LBC2518T6R8M TAIYO YUDEN	FIXED IND 6.8UH 420MA 300 MOHM	0
NRS2012T4R7MGJV TAIYO YUDEN	FIXED IND 4.7UH 910MA 241 MOHM	2817
MDKK2020T2R2MMV TAIYO YUDEN	FIXED IND 2.2UH 1.35A 165 MOHM	0
CB2518T330M TAIYO YUDEN	FIXED IND 33UH 460MA 460 MOHM	0
NRS4018T101MDGJV TAIYO YUDEN	FIXED IND 100UH 280MA 1.74 OHM	14510
NRS3015T6R8MNGH TAIYO YUDEN	FIXED IND 6.8UH 870MA 192 MOHM	0
LB2518T151MV TAIYO YUDEN	FIXED IND 150UH 45MA 4.16 OHM	0
LBC2518T101MV TAIYO YUDEN	FIXED IND 100UH 125MA 4.81 OHM	0
HK10052N0S-TV TAIYO YUDEN	FIXED IND 2NH 300MA 120 MOHM SMD	9895
NS12555T331MN TAIYO YUDEN	FIXED IND 330UH 960MA 410 MOHM	1555
NR3010T330M TAIYO YUDEN	FIXED IND 33UH 275MA 1.86 OHM	0
NR4018T101M TAIYO YUDEN	FIXED IND 100UH 270MA 1.8 OHM	38464
NS12555T102MN TAIYO YUDEN	FIXED IND 1MH 590MA 1.344 OHM	1207
NRH3012T1R0NNV TAIYO YUDEN	FIXED IND 1UH 1.71A 57.6 MOHM	2033
NS10145T101MNA TAIYO YUDEN	FIXED IND 100UH 1.25A 240 MOHM	1878
LB3218T220M TAIYO YUDEN	FIXED IND 22UH 255MA 490 MOHM	0
NS10145T151MNA TAIYO YUDEN	FIXED IND 150UH 940MA 409.2 MOHM	2115
NRS5030T3R3MMGJV TAIYO YUDEN	FIXED IND 3.3UH 3A 39 MOHM SMD	1931
CKP25201R5M-T TAIYO YUDEN	FIXED IND 1.5UH 1.3A 90 MOHM SMD	3510
HK21251N5S-T TAIYO YUDEN	FIXED IND 1.5NH 300MA 100 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