Fixed Inductors

Part Number	Description / PDF	Quantity
MPX1D0618L1R0 KEMET	FIXED IND 1UH 7.1A 19.3 MOHM SMD	898
MPX1D1250L220 KEMET	FIXED IND 22UH 6.7A 46.2 MOHM	244
MPXV1D1264L1R5 KEMET	FIXED IND 1.5UH 28.8A 2.9 MOHM	215
MPXV1D0630LR10 KEMET	FIXED IND 100NH 31.1A 1.5 MOHM	985
MPEV1D1040L1R0 KEMET	METAL INDUCTOR , A, MOHM, AEC-Q2	0
L0603B470MDWFT KEMET	FIXED IND 47UH 140MA 2.5 OHM SMD	1128
MPX1D0618LR33 KEMET	FIXED IND 330NH 12.7A 6.1 MOHM	997
MPEV1D1040L100 KEMET	METAL INDUCTOR , A, MOHM, AEC-Q2	0
L0806BR39JSWST KEMET	FIXED IND 390NH 440MA 260 MOHM	1900
SBC1-3R3-232 KEMET	FIXED IND 3.3UH 2.3A 40 MOHM TH	972
MPX1D1235L1R0 KEMET	FIXED IND 1UH 21.5A 4.2 MOHM SMD	0
MPXV1D0618LR68 KEMET	FIXED IND 680NH 8.8A 12.7 MOHM	1000
MPXV1D0530L4R7 KEMET	FIXED IND 4.7UH 4.6A 62.2 MOHM	983
SBCP-87HY102H KEMET	FIXED IND 1MH 250MA 2.82 OHM TH	1981
L1210R101MDWIT KEMET	FIXED IND 100UH 270MA 1.4 OHM	18
L1008L1R5MDMIT KEMET	FIXED IND 1.5UH 1.3A 90 MOHM SMD	3000
MPXV1D0650L2R2 KEMET	FIXED IND 2.2UH 11.2A 11.6MOHM	0
SBCP-47HY391B KEMET	FIXED IND 390UH 250MA 2 OHM TH	583
SBC1-101-571 KEMET	FIXED IND 100UH 570MA 650 MOHM	2017
SBCP-47HY821B KEMET	FIXED IND 820UH 160MA 5.3 OHM TH	552

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