Fixed Inductors

Part Number	Description / PDF	Quantity
SD14-151-R PowerStor (Eaton)	FIXED IND 150UH 315MA 2.52 OHM	0
EXL1V0606-3R3-R PowerStor (Eaton)	IND POWDER 3.30UH 10.5A	0
WCLA1608V1-120-R PowerStor (Eaton)	FIXED IND 12NH 700MA 0.13	0
SD52-3R5-R PowerStor (Eaton)	FIXED IND 3.5UH 1.73A 50.3 MOHM	0
HCF1007-2R2-R PowerStor (Eaton)	FIXED IND 2.2UH 10.7A 6.35 MOHM	0
MCQ1V1608-R470-R PowerStor (Eaton)	FIXED IND 470NH 50MA 700 MOHM	975
UP3B-1R0-R PowerStor (Eaton)	FIXED IND 1UH 12.5A 3.4 MOHM SMD	0
WCLA1005V1-1R0-R PowerStor (Eaton)	FIXED IND 1NH 1.36A 45 MOHM SMD	1000
DRAP127-151-R PowerStor (Eaton)	FIXED IND 150UH 1.52A 320 MOHM	0
UP4B-2R2-R PowerStor (Eaton)	FIXED IND 2.2UH 12A 4.8 MOHM SMD	120
SD25-821-R PowerStor (Eaton)	FIXED IND 820UH 230MA 5.04 OHM	0
MCL1608V2-1R8-R PowerStor (Eaton)	FIXED IND 1.8NH 500MA 100 MOHM	0
HC9-6R8-R PowerStor (Eaton)	FIXED IND 6.8UH 10.3A 9.4 MOHM	1059
HCM1A1305-330-R PowerStor (Eaton)	FIXED IND 33UH 4A 85.5MOHM SMD	165
MCL1608V1-3R3-R PowerStor (Eaton)	FIXED IND 3.3UH 100MA 650 MOHM	0
HCM1A1305V2-8R2-R PowerStor (Eaton)	FIXED IND 8.2UH 7.5A 18.5 MOHM	0
CTX100-10-52LPR PowerStor (Eaton)	FIXED IND 100UH 17.6A 10.9 MOHM	22
DR127-100-R PowerStor (Eaton)	FIXED IND 10UH 6.04A 17.2 MOHM	2988
SD10-4R7-R PowerStor (Eaton)	FIXED IND 4.7UH 1.04A 153.5 MOHM	3920
HCMA0703-1R5-R PowerStor (Eaton)	FIXED IND 1.5UH 9A 15 MOHM SMD	1405

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