Fixed Inductors

Part Number	Description / PDF	Quantity
SBCP-80HY6R8H KEMET	FIXED IND 6.8UH 3.3A 50 MOHM TH	500
MPX1D0830L100 KEMET	FIXED IND 10UH 5.4A 61.7 MOHM	917
SBC4-682-111 KEMET	FIXED IND 6.8MH 110MA 15 OHM TH	289
MPXV1D1250L2R2 KEMET	FIXED IND 2.2UH 21A 4.8MOHM SMD	250
SBCP-47HY270B KEMET	FIXED IND 27UH 960MA 137 MOHM TH	590
MPX1D1235L100 KEMET	FIXED IND 10UH 7.4A 35 MOHM SMD	0
MPX1D1770L6R8 KEMET	FIXED IND 6.8UH 19.5A 6.8 MOHM	200
SBC3-330-172 KEMET	FIXED IND 33UH 1.7A 90 MOHM TH	389
SBC7-330-342 KEMET	FIXED IND 33UH 3.4A 50 MOHM TH	182
SBC6-4R7-802 KEMET	FIXED IND 4.7UH 8A 10 MOHM TH	565
MPXV1D1235LR47 KEMET	FIXED IND 470NH 28.9A 2.3 MOHM	500
MPXV1D1740L220 KEMET	FIXED IND 22UH 6.5A 46.4 MOHM	100
MPX1D0520L1R0 KEMET	FIXED IND 1UH 7.6A 18.9 MOHM SMD	840
MPX1D1264LR47 KEMET	FIXED IND 470NH 38.2A 1.7 MOHM	250
SBC2-332-900 KEMET	FIXED IND 3.3MH 90MA 13.8 OHM TH	195
SBC6-1R5-942 KEMET	FIXED IND 1.5UH 9.4A 10 MOHM TH	1582
L0805C100MDWIT KEMET	FIXED IND 10UH 240MA 1.2 OHM SMD	9711
MPXV1D0630LR68 KEMET	FIXED IND 680NH 15.1A 6.2 MOHM	1000
MPX1D1264L1R0 KEMET	FIXED IND 1UH 32.2A 2.3 MOHM SMD	243
SBCP-14HY332B KEMET	FIXED IND 3.3MH 330MA 2.42 OHM	1248

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