Fixed Inductors

Part Number	Description / PDF	Quantity
L1008S4R7MDMIT KEMET	FIXED IND 4.7UH 1.1A 160 MOHM	3000
SBC3-102-281 KEMET	FIXED IND 1MH 280MA 2.37 OHM TH	1550
SBC9-100-422 KEMET	FIXED IND 10UH 4.2A 30 MOHM TH	1989
MPXV1D1740L2R2 KEMET	FIXED IND 2.2UH 20.5A 5 MOHM SMD	100
SBC2-222-121 KEMET	FIXED IND 2.2MH 120MA 8 OHM TH	185
L0402C27NJRMST KEMET	FIXED IND 27NH 300MA 700 MOHM	18028
L0805B1R5MDWLT KEMET	FIXED INDUCTOR 1.5UH SMD	3000
MPEV1D0630L220 KEMET	METAL INDUCTOR , A, MOHM, AEC-Q2	0
MPX1D1740L2R2 KEMET	FIXED IND 2.2UH 20.5A 5 MOHM SMD	100
SBC8-330-452 KEMET	FIXED IND 33UH 4.5A 40 MOHM TH	862
TPI111065L210N KEMET	FIXED INDUCTOR 210NH SMD	0
SBC8-391-122 KEMET	FIXED IND 390UH 1.2A 370 MOHM TH	86
MPXV1D1264LR22 KEMET	FIXED IND 220NH 53A 1.1MOHM SMD	250
TPI078060L047N KEMET	FIXED IND 47NH 53A 0.31 MOHM SMD	0
MPLCV1054L220 KEMET	FIXED IND 22UH 5.5A 47 MOHM SMD	3944
MPXV1D1250L470 KEMET	FIXED IND 47UH 4.5A 105.4 MOHM	249
MPXV1D0630LR47 KEMET	FIXED IND 470NH 18.7A 4 MOHM SMD	977
SBC1-470-711 KEMET	FIXED IND 47UH 710MA 340 MOHM TH	481
L0805B1R0MDWLT KEMET	FIXED INDUCTOR 1UH SMD	2805
MPXV1D1235LR33 KEMET	FIXED IND 330NH 33.4A 1.8 MOHM	500

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