Fixed Inductors

Part Number	Description / PDF	Quantity
HCM1A0703-R10-R PowerStor (Eaton)	FIXED IND 100NH 22A 1.4MOHM SMD	0
MCL2012V2-6R8-R PowerStor (Eaton)	FIXED IND 6.8NH 500MA 250 MOHM	0
EXL1V0603-1R8-R PowerStor (Eaton)	IND POWDER 1.80UH 13A	0
DR125-560-R PowerStor (Eaton)	FIXED IND 56UH 2.31A 102 MOHM	568
SD20-821-R PowerStor (Eaton)	FIXED IND 820UH 204MA 6.22 OHM	0
EXL1V0606-1R0-R PowerStor (Eaton)	IND POWDER 1.00UH 16A	500
SD6030-3R3-R PowerStor (Eaton)	FIXED IND 3.3UH 3.54A 24 MOHM	2158
MCQ1V2012-R470-R PowerStor (Eaton)	FIXED IND 470NH 200MA 500 MOHM	0
HCM1A1707V2-220-R PowerStor (Eaton)	FIXED IND 22UH 7.7A 22.2 MOHM	0
DRAP125-681-R PowerStor (Eaton)	FIXED IND 680UH 673MA 1.44 OHM	0
SD53-470-R PowerStor (Eaton)	FIXED IND 47UH 640MA 352 MOHM	3196
MCLA1005V2-430-R PowerStor (Eaton)	FIXED IND 43NH 200MA 1.1	0
DRAP127-100-R PowerStor (Eaton)	FIXED IND 10UH 6.02A 21 MOHM SMD	350
WCLA2012V1-390-R PowerStor (Eaton)	FIXED IND 39NH 500MA 0.29	0
WCL3225-330-R PowerStor (Eaton)	FIXED IND 33UH 160MA 2.9 OHM SMD	3940
MCLA1005V2-330-R PowerStor (Eaton)	FIXED IND 33NH 200MA 0.8	0
HCM1A1707-220-R PowerStor (Eaton)	FIXED IND 22UH 8A 23MOHM SMD	14
FP1308R3-R21-R PowerStor (Eaton)	FIXED IND 210NH 68A 0.18 MOHM	0
WCL3225-1R2-R PowerStor (Eaton)	FIXED IND 1.2UH 450MA 300 MOHM	3930
FP1505R1-R15-R PowerStor (Eaton)	FIXED IND 150NH 53A 0.47 MOHM	0

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