Fixed Inductors

Part Number	Description / PDF	Quantity
SBCP-80HY101H KEMET	FIXED IND 100UH 1.1A 350 MOHM TH	595
SBC2-1R5-402 KEMET	FIXED IND 1.5UH 4A 20 MOHM TH	418
SBC4-221-721 KEMET	FIXED IND 220UH 720MA 470 MOHM	1986
MPX1D0624L1R0 KEMET	FIXED IND 1UH 10.8A 10.5 MOHM	900
TPI128080L230N KEMET	FIXED IND 230NH 50A 0.29 MOHM	787
L1008Q3R3MDMIT KEMET	FIXED IND 3.3UH 1.1A 150 MOHM	1975
MPXV1D0840L1R0 KEMET	FIXED IND 1UH 20.8A 4.2MOHM SMD	994
L0402C10NJRMST KEMET	FIXED IND 10NH 300MA 310 MOHM	6557
SBC2-152-141 KEMET	FIXED IND 1.5MH 140MA 6.2 OHM TH	200
SBC3-561-421 KEMET	FIXED IND 560UH 420MA 1.2 OHM TH	385
L0805B2R2MDWLT KEMET	FIXED INDUCTOR 2.2UH SMD	2704
L0603B2R2MPWFT KEMET	FIXED IND 2.2UH 430MA 330 MOHM	2670
MPX1D1040L100 KEMET	FIXED IND 10UH 7A 34.1 MOHM SMD	471
MPX1D0624LR68 KEMET	FIXED IND 680NH 12.6A 7.8 MOHM	1000
MPXV1D0520L6R8 KEMET	FIXED IND 6.8UH 2.9A 130.5 MOHM	1000
SBCP-80HY150H KEMET	FIXED IND 15UH 2.5A 80 MOHM TH	490
SBCP-87HY471H KEMET	FIXED IND 470UH 420MA 1.3 OHM TH	498
MPXV1D0630L1R0 KEMET	FIXED IND 1UH 13.1A 8.2 MOHM SMD	1000
SBC6-470-232 KEMET	FIXED IND 47UH 2.3A 80 MOHM TH	1548
MPXV1D1040LR33 KEMET	FIXED IND 330NH 29.7A 1.9 MOHM	500

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