Fixed Inductors

Part Number	Description / PDF	Quantity
MPXV1D0830L3R3 KEMET	FIXED IND 3.3UH 8.9A 22.3 MOHM	999
SBC8-681-102 KEMET	FIXED IND 680UH 1A 520 MOHM TH	691
MPEV1D0630L4R7 KEMET	METAL INDUCTOR , A, MOHM, AEC-Q2	0
MPX1D0830L4R7 KEMET	FIXED IND 4.7UH 7.7A 29.7 MOHM	934
SBC4-103-111 KEMET	FIXED IND 10MH 110MA 19.5 OHM TH	1198
L0806B560JSWST KEMET	FIXED IND 56UH 95MA 5.9 OHM SMD	1904
MPLCV0645L100 KEMET	FIXED IND 10UH 4A 45 MOHM SMD	3194
SBCP-80HY151H KEMET	FIXED IND 150UH 1A 410 MOHM TH	482
MPXV1D1235LR22 KEMET	FIXED IND 220NH 35.2A 1.6 MOHM	500
L0805C4R7MDWIT KEMET	FIXED IND 4.7UH 360MA 500 MOHM	2915
SBCP-11HY4R7H KEMET	FIXED IND 4.7UH 4.1A 30 MOHM TH	400
MPX1D2213L220 KEMET	FIXED IND 22UH 19.5A 13.2 MOHM	50
MPEV1D1040L2R2 KEMET	METAL INDUCTOR , A, MOHM, AEC-Q2	0
MPXV1D0630LR22 KEMET	FIXED IND 220NH 23.3A 2.6 MOHM	1000
MPX1D0630L150 KEMET	FIXED IND 15UH 3.3A 130.2 MOHM	225
SBCP-47HY561B KEMET	FIXED IND 560UH 210MA 3.1 OHM TH	563
SBC8-222-471 KEMET	FIXED IND 2.2MH 470MA 1.8 OHM TH	134
MPXV1D0618LR15 KEMET	FIXED IND 150NH 16.2A 3.8 MOHM	1000
SBCP-14HY6R8B KEMET	FIXED IND 6.8UH 3.35A 30 MOHM TH	200
MPXV1D0840L220 KEMET	FIXED IND 22UH 4.2A 98.3MOHM SMD	896

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