Fixed Inductors

Part Number	Description / PDF	Quantity
MPX1D0840L100 KEMET	FIXED IND 10UH 6A 49.6 MOHM SMD	0
MPX1D0840L3R3 KEMET	FIXED IND 3.3UH 11.3A 14 MOHM	830
SBC7-101-192 KEMET	FIXED IND 100UH 1.9A 120 MOHM TH	981
MPEV1D1040LR47 KEMET	METAL INDUCTOR , A, MOHM, AEC-Q2	0
SBCP-80HY220H KEMET	FIXED IND 22UH 2.4A 80 MOHM TH	500
MPX1D1250L680 KEMET	FIXED IND 68UH 3.6A 163 MOHM SMD	196
MPXV1D0830L1R5 KEMET	FIXED IND 1.5UH 14A 9.1MOHM SMD	990
MPXV1D1740L330 KEMET	FIXED IND 33UH 5A 82.3 MOHM SMD	99
MPXV1D0830L150 KEMET	FIXED IND 15UH 4.3A 94.6MOHM SMD	971
L0806B680JSWST KEMET	FIXED IND 68UH 90MA 7 OHM SMD	1988
MPXV1D0840L150 KEMET	FIXED IND 15UH 5.2A 65MOHM SMD	0
SBCP-11HY681H KEMET	FIXED IND 680UH 550MA 1 OHM TH	1595
SBC3-3R3-472 KEMET	FIXED IND 3.3UH 4.7A 20 MOHM TH	371
SBC7-220-432 KEMET	FIXED IND 22UH 4.3A 30 MOHM TH	972
MPXV1D0520L100 KEMET	FIXED IND 10UH 2.2A 222.8 MOHM	6965
SNG-19DB-014 KEMET	FIXED IND 14UH 10 MOHM CHASSIS	146
SBCP-14HY682B KEMET	FIXED IND 6.8MH 220MA 7.17 OHM	194
MPX1D0624L1R5 KEMET	FIXED IND 1.5UH 8.1A 18.5 MOHM	1000
SBC7-472-281 KEMET	FIXED IND 4.7MH 280MA 4.83 OHM	174
L0805C1R0MPWST KEMET	FIXED IND 1UH 300MA 150 MOHM SMD	1190

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