Fixed Inductors

Part Number	Description / PDF	Quantity
MPXV1D1054LR33 KEMET	FIXED IND 330NH 37.3A 1.27MOHM	475
SBC3-221-681 KEMET	FIXED IND 220UH 680MA 490 MOHM	1736
MPLCV0654L330 KEMET	FIXED IND 33UH 2.6A 140 MOHM SMD	3814
MPXV1D1040LR68 KEMET	FIXED IND 680NH 23.1A 3.2 MOHM	500
SBC4-680-122 KEMET	FIXED IND 68UH 1.2A 190 MOHM TH	2976
MPXV1D0618L2R2 KEMET	FIXED IND 2.2UH 5.4A 33.8 MOHM	1000
SBC6-222-351 KEMET	FIXED IND 2.2MH 350MA 2.63 OHM	78
MPXV1D0630L3R3 KEMET	FIXED IND 3.3UH 6.8A 30.3 MOHM	1000
MPX1D0650L1R0 KEMET	FIXED IND 1UH 15.6A 6 MOHM SMD	920
MPX1D2213L101 KEMET	FIXED IND 100UH 10A 47.4 MOHM	87
MPXV1D1040L6R8 KEMET	FIXED IND 6.8UH 8.3A 24.1 MOHM	495
SBC4-4R7-582 KEMET	FIXED IND 4.7UH 5.8A 20 MOHM TH	467
MPXV1D0618L4R7 KEMET	FIXED IND 4.7UH 3.4A 83.4 MOHM	972
SBC2-4R7-262 KEMET	FIXED IND 4.7UH 2.6A 40 MOHM TH	445
SBCP-80HY680H KEMET	FIXED IND 68UH 1.7A 160 MOHM TH	624
MPXV1D1264LR47 KEMET	FIXED IND 470NH 38.2A 1.7 MOHM	250
L0402C68NJRMST KEMET	FIXED IND 68NH 180MA 1.2 OHM SMD	14743
SBCP-80HY470H KEMET	FIXED IND 47UH 1.9A 130 MOHM TH	895
MPLCG0630L4R7 KEMET	FIXED IND 4.7UH 5.5A 41 MOHM SMD	0
MPX1D2213L6R8 KEMET	FIXED IND 6.8UH 39A 3.3 MOHM SMD	91

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