Fixed Inductors

Part Number	Description / PDF	Quantity
MPXV1D1040L3R3 KEMET	FIXED IND 3.3UH 11.4A 12.8 MOHM	500
L1008Q1R0MDMIT KEMET	FIXED IND 1UH 1.2A 120 MOHM SMD	2000
L0805C1R8KSMST KEMET	FIXED IND 1.8UH 50MA 600 MOHM	0
MPLCV1054L100 KEMET	FIXED IND 10UH 7.1A 25 MOHM SMD	3864
L0805C1R5MDMIT KEMET	FIXED IND 1.5UH 800MA 200 MOHM	0
L1210R220MDWIT KEMET	FIXED IND 22UH 620MA 270 MOHM	2561
L1008Q2R2MDMIT KEMET	FIXED IND 2.2UH 1.1A 150 MOHM	2000
MPXV1D0830L330 KEMET	FIXED IND 33UH 2.8A 229.5 MOHM	992
MPX1D0830L2R2 KEMET	FIXED IND 2.2UH 11.4A 13.6 MOHM	420
L0805C470MDWIT KEMET	FIXED IND 47UH 120MA 5.8 OHM SMD	4102
MPX1D0840LR22 KEMET	FIXED IND 220NH 35.4A 1.5 MOHM	873
L0805C470MPWST KEMET	FIXED IND 47UH 50MA 3.7 OHM SMD	1802
MPX1D1250L3R3 KEMET	FIXED IND 3.3UH 16.8A 7.4 MOHM	250
MPXV1D0630L150 KEMET	FIXED IND 15UH 3.3A 130.2 MOHM	976
MPLC0730L1R0 KEMET	FIXED IND 1UH 10.6A 9 MOHM SMD	14173
SBC3-681-361 KEMET	FIXED IND 680UH 360MA 1.62 OHM	1773
SBC9-101-122 KEMET	FIXED IND 100UH 1.2A 210 MOHM TH	218
SBC8-103-251 KEMET	FIXED IND 10MH 250MA 6.9 OHM TH	196
SBC8-470-372 KEMET	FIXED IND 47UH 3.7A 40 MOHM TH	897
MPXV1D1040L1R5 KEMET	FIXED IND 1.5UH 17.7A 5.4 MOHM	500

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