Fixed Inductors

Part Number	Description / PDF	Quantity
HC1-5R1-R PowerStor (Eaton)	FIXED IND 5.1UH 12.79A 5.7 MOHM	952
FP0705R3-R10-R PowerStor (Eaton)	FIXED IND 105NH 32A 0.46 MOHM	950
FP1007R3-R12-R PowerStor (Eaton)	FIXED IND 115NH 61A 0.29 MOHM	4782
WCLA1005V1-5R1-R PowerStor (Eaton)	FIXED IND 5.1NH 800MA 0.083	0
HCM1A0503-100-R PowerStor (Eaton)	FIXED IND 10UH 2.4A 108MOHM SMD	1996
SD3112-8R2-R PowerStor (Eaton)	FIXED IND 8.2UH 570MA 408 MOHM	0
UP4B-4R7-R PowerStor (Eaton)	FIXED IND 4.7UH 8.6A 833 MOHM	0
MPIA4015V2-100-R PowerStor (Eaton)	FIXED IND 10UH 1.8A 294 MOHM SMD	0
UP3B-3R3-R PowerStor (Eaton)	FIXED IND 3.3UH 8A 8.3 MOHM SMD	0
UP2-101-R PowerStor (Eaton)	FIXED IND 100UH 1.4A 277.2 MOHM	440
DR124-101-R PowerStor (Eaton)	FIXED IND 100UH 1.5A 308 MOHM	677
HCP0805-2R2-R PowerStor (Eaton)	FIXED IND 2.2UH 10A 11.2 MOHM	3430
MCQ1V1608-1R0-R PowerStor (Eaton)	FIXED IND 1UH 25MA 500 MOHM SMD	0
MCL1005-3R0-R PowerStor (Eaton)	FIXED IND 3NH 300MA 200 MOHM SMD	19390
HCM1A1105V2-1R0-R PowerStor (Eaton)	FIXED IND 1UH 20A 2.4 MOHM SMD	0
MPIA4015V2-1R5-R PowerStor (Eaton)	FIXED IND 1.5UH 4.2A 58 MOHM SMD	3000
SD52-470-R PowerStor (Eaton)	FIXED IND 47UH 580MA 446.5 MOHM	0
SD20-151-R PowerStor (Eaton)	FIXED IND 150UH 435MA 1.37 OHM	0
WCLA2012V1-220-R PowerStor (Eaton)	FIXED IND 22NH 500MA 0.22	0
WCLA1608V1-271-R PowerStor (Eaton)	FIXED IND 270NH 170MA 2.3 OHM	1000

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