Fixed Inductors

Part Number	Description / PDF	Quantity
MPX1D0650LR68 KEMET	FIXED IND 680NH 18.8A 4.1 MOHM	1000
MPXV1D0630L100 KEMET	FIXED IND 10UH 4.2A 78 MOHM SMD	903
MPX1D1040L1R5 KEMET	FIXED IND 1.5UH 17.7A 5.4 MOHM	442
MPXV1D1250L1R0 KEMET	FIXED IND 1UH 28.8A 2.6MOHM SMD	247
SBCP-14HY330B KEMET	FIXED IND 33UH 2.4A 70 MOHM TH	199
SBC8-6R8-862 KEMET	FIXED IND 6.8UH 8.6A 20 MOHM TH	896
MPXV1D0520L3R3 KEMET	FIXED IND 3.3UH 4.1A 64.2 MOHM	1000
SBC6-220-302 KEMET	FIXED IND 22UH 3A 50 MOHM TH	37
SBCP-80HY103HB KEMET	FIXED IND 10MH 100MA 19.1 OHM TH	144
MPXV1D1740L470 KEMET	FIXED IND 47UH 4A 125.7 MOHM SMD	100
MPX1D0530L2R2 KEMET	FIXED IND 2.2UH 7.3A 24.6 MOHM	787
MPX1D1235L2R2 KEMET	FIXED IND 2.2UH 15.2A 8.4 MOHM	500
L1210R2R2MDWIT KEMET	FIXED IND 2.2UH 2A 80 MOHM SMD	17157
MPX1D2213L470 KEMET	FIXED IND 47UH 15.5A 20.5 MOHM	0
SBCP-47HY220B KEMET	FIXED IND 22UH 1.05A 123 MOHM TH	573
MPX1D0630LR10 KEMET	FIXED IND 100NH 31.1A 1.5 MOHM	885
SBC9-470-202 KEMET	FIXED IND 47UH 2A 90 MOHM TH	249
SBC8-102-761 KEMET	FIXED IND 1MH 760MA 780 MOHM TH	668
MPX1D0630LR68 KEMET	FIXED IND 680NH 15.1A 6.2 MOHM	1000
L0402C4N7SRMST KEMET	FIXED IND 4.7NH 300MA 210 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