Fixed Inductors

Part Number	Description / PDF	Quantity
DRAP125-331-R PowerStor (Eaton)	FIXED IND 330UH 998MA 650 MOHM	0
DR125-2R2-R PowerStor (Eaton)	FIXED IND 2.2UH 10.9A 4.5 MOHM	1390
SD52-220-R PowerStor (Eaton)	FIXED IND 22UH 860MA 204.2 MOHM	0
DRA124-2R2-R PowerStor (Eaton)	FIXED IND 2.2UH 7.64A 7 MOHM SMD	747
MPI4020V2-6R8-R PowerStor (Eaton)	FIXED IND 6.8UH 2.4A 175 MOHM	2361
MCLA2012V1-8R2-R PowerStor (Eaton)	FIXED IND 8.2UH 15MA 1.05	0
LD1-1R0-R PowerStor (Eaton)	FIXED IND 1UH 2.66A 33 MOHM SMD	626
DRAP127-470-R PowerStor (Eaton)	FIXED IND 47UH 2.62A 110 MOHM	350
DR1050-220-R PowerStor (Eaton)	FIXED IND 22UH 3.12A 48.4 MOHM	1111
MCQ1V1608-1R8-R PowerStor (Eaton)	FIXED IND 1.8UH 25MA 750 MOHM	0
SD20-R47-R PowerStor (Eaton)	FIXED IND 470NH 3.59A 20 MOHM	0
MCLA3216V1-1R5-R PowerStor (Eaton)	FIXED IND 1.5UH 50MA 0.4	0
HCMA1305-6R8-R PowerStor (Eaton)	FIXED IND 6.8UH 11A 15 MOHM SMD	0
UP4B-101-R PowerStor (Eaton)	FIXED IND 100UH 2A 170 MOHM SMD	102
DR74-821-R PowerStor (Eaton)	FIXED IND 820UH 310MA 2.93 OHM	426
EXL1V0606-6R8-R PowerStor (Eaton)	IND POWDER 6.80UH 8.7A	500
WCL3225-1R8-R PowerStor (Eaton)	FIXED IND 1.8UH 450MA 500 MOHM	0
FP1007R2-R12-R PowerStor (Eaton)	FIXED IND 120NH 51A 0.48 MOHM	0
MCL1608V1-1R2-R PowerStor (Eaton)	FIXED IND 1.2UH 150MA 300 MOHM	6540
FPV1006-125-R PowerStor (Eaton)	FIXED IND 125NH 25A 0.41 MOHM	595

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