Fixed Inductors

Part Number	Description / PDF	Quantity
MPX1D2213L3R3 KEMET	FIXED IND 3.3UH 54A 1.8 MOHM SMD	25
MPX1D0520L1R5 KEMET	FIXED IND 1.5UH 5.6A 35.6 MOHM	995
L0806B220JSWST KEMET	FIXED IND 22UH 140MA 2.8 OHM SMD	1839
L1008CR47MDMIT KEMET	FIXED IND 470NH 1.8A 50 MOHM SMD	2700
SNG-19A-080 KEMET	FIXED INDUCTOR 80UH 10 MOHM	72
MPLC1040L2R2 KEMET	FIXED IND 2.2UH 10.5A 10 MOHM	1000
SBC8-682-311 KEMET	FIXED IND 6.8MH 310MA 4.9 OHM TH	143
SBC9-152-341 KEMET	FIXED IND 1.5MH 340MA 2.49 OHM	200
L0806B8R2JSWST KEMET	FIXED IND 8.2UH 225MA 1.1 OHM	1393
SBCP-47HY330B KEMET	FIXED IND 33UH 870MA 169 MOHM TH	600
L0806BR82JSWST KEMET	FIXED IND 820NH 390MA 340 MOHM	1857
MPX1D1040L470 KEMET	FIXED IND 47UH 3A 182.6 MOHM SMD	483
MPXV1D1770LR47 KEMET	FIXED IND 470NH 52.5A 1 MOHM SMD	100
SNG-25A-600 KEMET	FIXED INDUCTOR 600UH 20 MOHM	33
SBC1-152-181 KEMET	FIXED IND 1.5MH 180MA 8 OHM TH	203
MPX1D0530L220 KEMET	FIXED IND 22UH 2A 341.2 MOHM SMD	818
SBC1-561-291 KEMET	FIXED IND 560UH 290MA 3.4 OHM TH	5142
MPLCH0740L4R7 KEMET	FIXED IND 4.7UH 5.8A 33 MOHM SMD	538
SHB-30-20V KEMET	FIXED IND 44UH 30A 7 MOHM TH	0
MPCH1040L1R0 KEMET	INDUCTOR, SMD LOW DCR, 1UH, 17A,	1000

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