Fixed Inductors

Part Number	Description / PDF	Quantity
SBCP-87HY2R2H KEMET	FIXED IND 2.2UH 4A 30 MOHM TH	462
SBCP-14HY102B KEMET	FIXED IND 1MH 590MA 1.16 OHM TH	6
MPXV1D1235L6R8 KEMET	FIXED IND 6.8UH 9.4A 21.7 MOHM	1000
L0805B470MDWLT KEMET	FIXED INDUCTOR 47UH SMD	3000
MPX1D0630L1R0 KEMET	FIXED IND 1UH 13.1A 8.2 MOHM SMD	850
SBCP-87HY4R7H KEMET	FIXED IND 4.7UH 3.2A 30 MOHM TH	0
MPXV1D0520LR22 KEMET	FIXED IND 220NH 15A 5 MOHM SMD	1000
L0806B2R7JSWST KEMET	FIXED IND 2.7UH 310MA 590 MOHM	1828
MPX1D1250L100 KEMET	FIXED IND 10UH 10.1A 20.6 MOHM	245
SBCP-47HY121B KEMET	FIXED IND 120UH 450MA 657 MOHM	511
SBCP-80HY121H KEMET	FIXED IND 120UH 1.1A 350 MOHM TH	464
MPX1D0624LR10 KEMET	FIXED IND 100NH 26.6A 1.8 MOHM	863
MPLCG0630L2R2 KEMET	FIXED IND 2.2UH 8.2A 19 MOHM SMD	1733
SBC8-331-142 KEMET	FIXED IND 330UH 1.4A 250 MOHM TH	623
SBC4-330-182 KEMET	FIXED IND 33UH 1.8A 90 MOHM TH	287
SBC9-680-152 KEMET	FIXED IND 68UH 1.5A 150 MOHM TH	206
MPLC0730L3R3 KEMET	FIXED IND 3.3UH 5.7A 30 MOHM SMD	1283
MPX1D0530L4R7 KEMET	FIXED IND 4.7UH 4.6A 62.2 MOHM	937
L0805B100MDWLT KEMET	FIXED INDUCTOR 10UH SMD	1
MPLCH0740L3R3 KEMET	FIXED IND 3.3UH 7.8A 19 MOHM SMD	886

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