Fixed Inductors

Part Number	Description / PDF	Quantity
SBC7-332-361 KEMET	FIXED IND 3.3MH 360MA 3.51 OHM	182
SBC4-1R5-712 KEMET	FIXED IND 1.5UH 7.1A 10 MOHM TH	199
SBC7-150-482 KEMET	FIXED IND 15UH 4.8A 30 MOHM TH	198
MPXV1D0630L220 KEMET	FIXED IND 22UH 2.7A 186.3 MOHM	960
L0603B470KPWFT KEMET	FIXED IND 47UH 90MA 5.8 OHM SMD	5415
L0603B470MPWFT KEMET	FIXED IND 47UH 90MA 5.8 OHM SMD	2477
SBCP-14HY470B KEMET	FIXED IND 47UH 1.9A 90 MOHM TH	200
SBCP-11HY221H KEMET	FIXED IND 220UH 950MA 400 MOHM	230
MPLCG0530LR22 KEMET	FIXED IND 220NH 14.1A 3.7 MOHM	3240
MPXV1D0650L1R5 KEMET	FIXED IND 1.5UH 13.2A 8.3 MOHM	0
SBCP-11HY6R8H KEMET	FIXED IND 6.8UH 3.6A 30 MOHM TH	400
SBC6-2R7-872 KEMET	FIXED IND 2.7UH 8.7A 10 MOHM TH	1579
MPXV1D0840L330 KEMET	FIXED IND 33UH 3.4A 154.2 MOHM	1975
SBC7-103-191 KEMET	FIXED IND 10MH 190MA 10.3 OHM TH	51
MPX1D1040L2R2 KEMET	FIXED IND 2.2UH 14.6A 7.9 MOHM	340
SBCP-80HY102H KEMET	FIXED IND 1MH 400MA 1.89 OHM TH	978
SBCP-80HY221H KEMET	FIXED IND 220UH 900MA 520 MOHM	500
MPX1D1770L470 KEMET	FIXED IND 47UH 6.5A 62.8 MOHM	88
MPX1D0650L6R8 KEMET	FIXED IND 6.8UH 5.7A 44.2 MOHM	977
MPXV1D1235L1R0 KEMET	FIXED IND 1UH 21.5A 4.2MOHM SMD	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