Fixed Inductors

Part Number	Description / PDF	Quantity
SBC6-103-161 KEMET	FIXED IND 10MH 160MA 13.6 OHM TH	978
MPX1D0830LR47 KEMET	FIXED IND 470NH 24A 3.1 MOHM SMD	900
L0603C1R0MDMIT KEMET	FIXED IND 1UH 750MA 200 MOHM SMD	3913
MPX1D1235LR15 KEMET	FIXED IND 150NH 39.9A 1.3 MOHM	490
SBC7-152-481 KEMET	FIXED IND 1.5MH 480MA 1.58 OHM	1000
MPXV1D0830L2R2 KEMET	FIXED IND 2.2UH 11.4A 13.6 MOHM	875
MPXV1D0520L4R7 KEMET	FIXED IND 4.7UH 3.4A 96.6 MOHM	919
SBC2-102-181 KEMET	FIXED IND 1MH 180MA 4 OHM TH	1428
MPX1D1040L1R0 KEMET	FIXED IND 1UH 21.1A 3.8 MOHM SMD	500
MPXV1D1040L100 KEMET	FIXED IND 10UH 7A 34.1 MOHM SMD	427
SBCP-47HY221B KEMET	FIXED IND 220UH 330MA 1.1 OHM TH	430
MPXV1D1770L2R2 KEMET	FIXED IND 2.2UH 31A 2.6 MOHM SMD	50
L1008C1R5MDMIT KEMET	FIXED IND 1.5UH 1.3A 90 MOHM SMD	3000
MPXV1D1054L150 KEMET	FIXED IND 15UH 6.7A 39.1 MOHM	472
SBC2-681-211 KEMET	FIXED IND 680UH 210MA 3.1 OHM TH	200
MPXV1D1040L220 KEMET	FIXED IND 22UH 4.7A 76.1 MOHM	465
SBCP-11HY3R3H KEMET	FIXED IND 3.3UH 4.4A 20 MOHM TH	395
MPX1D1040L3R3 KEMET	FIXED IND 3.3UH 11.4A 12.8 MOHM	432
TPI118082L180N KEMET	FIXED IND 180NH 50A 0.29 MOHM	390
MPXV1D1250L330 KEMET	FIXED IND 33UH 5.4A 72MOHM SMD	92

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