Fixed Inductors

Part Number	Description / PDF	Quantity
SBCP-14HY3R3B KEMET	FIXED IND 3.3UH 4.1A 20 MOHM TH	133
MPX1D0840L4R7 KEMET	FIXED IND 4.7UH 8.7A 23.5 MOHM	880
MPXV1D0830L100 KEMET	FIXED IND 10UH 5.4A 61.7 MOHM	1000
MPX1D0520LR68 KEMET	FIXED IND 680NH 9.5A 12.2 MOHM	990
SBC4-471-491 KEMET	FIXED IND 470UH 490MA 950 MOHM	1407
SBC3-2R2-602 KEMET	FIXED IND 2.2UH 6A 20 MOHM TH	377
L0603C3N3SRMST KEMET	FIXED IND 3.3NH 300MA 120 MOHM	0
SNG-19DA-014 KEMET	FIXED INDUCTOR 14UH 10 MOHM	150
MPXV1D1740LR68 KEMET	FIXED IND 680NH 32A 2 MOHM SMD	100
L0603C2R2MDMIT KEMET	FIXED IND 2.2UH 650MA 300 MOHM	8000
MPX1D2213L330 KEMET	FIXED IND 33UH 17.5A 16 MOHM SMD	246
SBC8-151-202 KEMET	FIXED IND 150UH 2A 150 MOHM TH	802
MPXV1D0630LR33 KEMET	FIXED IND 330NH 21.1A 3.2 MOHM	992
SBCP-14HY331B KEMET	FIXED IND 330UH 950MA 380 MOHM	1160
SBC4-681-431 KEMET	FIXED IND 680UH 430MA 1.32 OHM	1985
MPXV1D0630L2R2 KEMET	FIXED IND 2.2UH 8.7A 18.3 MOHM	990
MPXV1D0530L3R3 KEMET	FIXED IND 3.3UH 5.5A 42.8 MOHM	986
MPX1D0630L100 KEMET	FIXED IND 10UH 4.2A 78 MOHM SMD	868
SBCP-47HY8R2B KEMET	FIXED IND 8.2UH 1.7A 59 MOHM TH	507
SBCP-47HY680B KEMET	FIXED IND 68UH 600MA 397 MOHM TH	588

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