Fixed Inductors

Part Number	Description / PDF	Quantity
MPXV1D0624LR33 KEMET	FIXED IND 330NH 17.2A 4.2 MOHM	995
SBC7-682-211 KEMET	FIXED IND 6.8MH 210MA 7 OHM TH	175
L1008S2R2MDMIT KEMET	FIXED IND 2.2UH 1.2A 115 MOHM	2988
MPXV1D0530L100 KEMET	FIXED IND 10UH 3.1A 140.1 MOHM	698
SBC7-331-941 KEMET	FIXED IND 330UH 940MA 450 MOHM	150
SBC4-222-211 KEMET	FIXED IND 2.2MH 210MA 4.97 OHM	275
MPXV1D1054L3R3 KEMET	FIXED IND 3.3UH 14.4A 8.4 MOHM	315
MPXV1D2213L6R8 KEMET	FIXED IND 6.8UH 39A 3.3 MOHM SMD	0
MPX1D0530LR22 KEMET	FIXED IND 220NH 18.4A 3.9 MOHM	900
MPXV1D1770L220 KEMET	FIXED IND 22UH 10.5A 22.9 MOHM	0
L0805C2R2MDMIT KEMET	FIXED IND 2.2UH 800MA 200 MOHM	2802
SBC2-151-501 KEMET	FIXED IND 150UH 500MA 640 MOHM	177
MPX1D0650L4R7 KEMET	FIXED IND 4.7UH 6.7A 32 MOHM SMD	943
SBCP-47HY560B KEMET	FIXED IND 56UH 650MA 350 MOHM TH	575
SBCP-47HY5R6B KEMET	FIXED IND 5.6UH 1.95A 49 MOHM TH	555
SBC3-150-232 KEMET	FIXED IND 15UH 2.3A 50 MOHM TH	400
L0201C33NJRMST KEMET	FIXED IND 33NH 50MA 2.1 OHM SMD	2967
MPXV1D1250L1R5 KEMET	FIXED IND 1.5UH 24.2A 3.6 MOHM	250
MPXV1D0618LR10 KEMET	FIXED IND 100NH 18.9A 2.8 MOHM	1000
SBCP-47HY471B KEMET	FIXED IND 470UH 220MA 2.8 OHM TH	551

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