Fixed Inductors

Part Number	Description / PDF	Quantity
MPX1D0624L2R2 KEMET	FIXED IND 2.2UH 6.3A 30.7 MOHM	898
MPX1D1770L220 KEMET	FIXED IND 22UH 10.5A 22.9 MOHM	0
MPX1D0618LR47 KEMET	FIXED IND 470NH 10.7A 8.5 MOHM	890
MPX1D0520L2R2 KEMET	FIXED IND 2.2UH 5.2A 40.4 MOHM	866
L0603B3R3MDWFT KEMET	FIXED INDUCTOR 3.3UH SMD	2757
TPI078060L082N KEMET	FIXED IND 82NH 53A 341 MOHM SMD	1996
L1207C470KPWST KEMET	FIXED IND 47UH 205MA 920 MOHM	2670
MPXV1D1770L470 KEMET	FIXED IND 47UH 6.5A 62.8 MOHM	61
SBC1-1R0-312 KEMET	FIXED IND 1UH 3.1A 30 MOHM TH	2825
SBCP-87HY330H KEMET	FIXED IND 33UH 1.5A 120 MOHM TH	457
SBC9-222-271 KEMET	FIXED IND 2.2MH 270MA 3.78 OHM	176
MPXV1D2213L4R7 KEMET	FIXED IND 4.7UH 48A 2.2 MOHM SMD	37
MPXV1D0830LR33 KEMET	FIXED IND 330NH 25.8A 2.7 MOHM	1000
MPXV1D1770L6R8 KEMET	FIXED IND 6.8UH 19.5A 6.8 MOHM	90
SBCP-80HY100H KEMET	FIXED IND 10UH 2.9A 50 MOHM TH	568
SNG-25DA-086 KEMET	FIXED INDUCTOR 86UH 20 MOHM	99
L0806C3R3MDMIT KEMET	FIXED IND 3.3UH 1.1A 160 MOHM	2888
MPXV1D0650L3R3 KEMET	FIXED IND 3.3UH 8.7A 18.9 MOHM	998
SBCP-47HY152B KEMET	FIXED IND 1.5MH 130MA 8 OHM TH	600
SBC3-6R8-392 KEMET	FIXED IND 6.8UH 3.9A 30 MOHM TH	400

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