Fixed Inductors

Part Number	Description / PDF	Quantity
MPX1D1740L6R8 KEMET	FIXED IND 6.8UH 11.5A 15.9 MOHM	60
MPX1D0840L2R2 KEMET	FIXED IND 2.2UH 14.3A 8.7 MOHM	2000
MPXV1D0650L1R0 KEMET	FIXED IND 1UH 15.6A 6MOHM SMD	915
MPLCG0530L2R2 KEMET	FIXED IND 2.2UH 4.5A 36.4 MOHM	0
SBC9-2R2-792 KEMET	FIXED IND 2.2UH 7.9A 10 MOHM TH	248
SBCP-11HY220H KEMET	FIXED IND 22UH 2.5A 60 MOHM TH	377
MPCH1250L1R5 KEMET	FIXED IND 1.5UH 21A 2.2 MOHM SMD	3
MPX1D0520LR22 KEMET	FIXED IND 220NH 15A 5 MOHM SMD	828
MPXV1D2213L470 KEMET	FIXED IND 47UH 15.5A 20.5 MOHM	74
MPX1D0830LR33 KEMET	FIXED IND 330NH 25.8A 2.7 MOHM	1000
MPEV1D1040L330 KEMET	METAL INDUCTOR , A, MOHM, AEC-Q2	0
MPXV1D1770L330 KEMET	FIXED IND 33UH 7.5A 47.3 MOHM	86
L0806B120JSWST KEMET	FIXED IND 12UH 200MA 1.4 OHM SMD	2874
L0806C4R7MPWST KEMET	FIXED IND 4.7UH 210MA 250 MOHM	0
MPXV1D0840L100 KEMET	FIXED IND 10UH 6A 49.6MOHM SMD	1000
SBC6-102-561 KEMET	FIXED IND 1MH 560MA 1.21 OHM TH	235
MPX1D1235L6R8 KEMET	FIXED IND 6.8UH 9.4A 21.7 MOHM	0
MPX1D1040L6R8 KEMET	FIXED IND 6.8UH 8.3A 24.1 MOHM	498
MPXV1D1264L3R3 KEMET	FIXED IND 3.3UH 19.7A 6.2 MOHM	216
SBC4-331-591 KEMET	FIXED IND 330UH 590MA 670 MOHM	295

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