Fixed Inductors

Part Number	Description / PDF	Quantity
NRS4018T3R3MDGJV TAIYO YUDEN	FIXED IND 3.3UH 2A 66 MOHM SMD	2161
LBR2012T4R7M TAIYO YUDEN	FIXED IND 4.7UH 200MA 240 MOHM	15015
CKP1608D1R0M-T TAIYO YUDEN	FIXED IND 1UH 750MA 200 MOHM SMD	8000
EST1060T1R5NDGA TAIYO YUDEN	FIXED IND 1.5UH 8A 7MOHM SMD	0
MAMK2520H1R0M TAIYO YUDEN	FIXED IND 1UH 3.1A 45 MOHM SMD	6504
HK1005R18J-T TAIYO YUDEN	FIXED IND 180NH 200MA 3.7 OHM	452
NS12575T1R2NNV TAIYO YUDEN	FIXED IND 1.2UH 9.15A 7MOHM SMD	0
LBM2016TR15J TAIYO YUDEN	FIXED IND 150NH 570MA 150 MOHM	0
LHL10NB821K TAIYO YUDEN	FIXED IND 820UH 420MA 1.4 OHM TH	0
HK1608R15J-T TAIYO YUDEN	FIXED IND 150NH 300MA 1.2 OHM	37965
NRV2010T4R7MGFV TAIYO YUDEN	FIXED IND 4.7UH 820MA 320 MOHM	2587
NRV2012T2R2MGF TAIYO YUDEN	FIXED IND 2.2UH 1.2A 154.8 MOHM	2458
NRS6028T3R0NMGJV TAIYO YUDEN	FIXED IND 3UH 3.4A 29.9 MOHM SMD	0
NRS8040T1R4NJGJV TAIYO YUDEN	FIXED IND 1.4UH 7A 9.1 MOHM SMD	0
LK2125R12M-T TAIYO YUDEN	FIXED IND 120NH 270MA 200 MOHM	0
LK1005R15M-TV TAIYO YUDEN	FIXED IND 150NH 25MA 630 MOHM	0
NS12575T102MNV TAIYO YUDEN	FIXED IND 1MH 530MA 1.404OHM SMD	0
CBC3225T220KR TAIYO YUDEN	FIXED IND 22UH 780MA 351 MOHM	2105
LHL10NB223J TAIYO YUDEN	FIXED IND 22MH 75MA 43 OHM TH	0
NS12565T221MNV TAIYO YUDEN	FIXED IND 220UH 1.18A 327.6 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