Fixed Inductors

Part Number	Description / PDF	Quantity
SNG-25DB-086 KEMET	FIXED IND 86UH 20 MOHM CHASSIS	96
MPX1D1740L470 KEMET	FIXED IND 47UH 4A 125.7 MOHM	99
MPXV1D0624L2R2 KEMET	FIXED IND 2.2UH 6.3A 30.7 MOHM	1000
MPX1D2213L1R0 KEMET	FIXED IND 1UH 74A 1 MOHM SMD	133
MPXV1D1264LR33 KEMET	FIXED IND 330NH 45.6A 1.2 MOHM	230
SBC9-3R3-622 KEMET	FIXED IND 3.3UH 6.2A 20 MOHM TH	219
SBCP-11HY102H KEMET	FIXED IND 1MH 420MA 1.7 OHM TH	196
MPX1D1250L6R8 KEMET	FIXED IND 6.8UH 11.6A 15.5 MOHM	98
MPEV1D0630LR68 KEMET	METAL INDUCTOR , A, MOHM, AEC-Q2	0
SBCP-80HY330H KEMET	FIXED IND 33UH 2.1A 90 MOHM TH	399
MPXV1D1250L680 KEMET	FIXED IND 68UH 3.6A 163MOHM SMD	199
SBC6-151-122 KEMET	FIXED IND 150UH 1.2A 230 MOHM TH	1529
MPXV1D0618LR33 KEMET	FIXED IND 330NH 12.7A 6.1 MOHM	1000
L0805B330MDWLT KEMET	FIXED INDUCTOR 33UH SMD	2463
MPX1D0630L6R8 KEMET	FIXED IND 6.8UH 5.2A 50.9 MOHM	975
SBC6-681-631 KEMET	FIXED IND 680UH 630MA 980 MOHM	992
MPXV1D0530L6R8 KEMET	FIXED IND 6.8UH 3.5A 107.8 MOHM	794
MPXV1D2213L220 KEMET	FIXED IND 22UH 19.5A 13.2 MOHM	85
L0603B3R3MPWFT KEMET	FIXED INDUCTOR 3.3UH 130MA SMD	2760
MPX1D1740L220 KEMET	FIXED IND 22UH 6.5A 46.4 MOHM	100

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