Fixed Inductors

Part Number	Description / PDF	Quantity
AIUR-06-270K Abracon	FIXED IND 27UH 3.8A 46 MOHM TH	0
AIRD-02-471K Abracon	FIXED IND 470UH 1.6A 355 MOHM TH	0
AIMC-0201-1N0S-T Abracon	FIXED IND 1NH 300MA 200 MOHM SMD	0
AMPLA1306S-7R0MT Abracon	FIXED IND 7UH 11.2A 12.3 MOHM	0
AIRD-03-561K Abracon	FIXED IND 560UH 4A 210 MOHM TH	355
ASPIAIG-F6030-1R2M-T Abracon	FIXED IND 1.2UH 16A 7.4 MOHM SMD	420
AIRD-03-220K Abracon	FIXED IND 22UH 13.5A 11 MOHM TH	375
ASPI-0310FS-150M-T2 Abracon	FIXED IND 15UH 800MA 510 MOHM	0
ASPIAIG-S4035-150M-T Abracon	FIXED IND 15UH 1.45A 230MOHM SMD	2753
AMDLA4530Q-4R7MT Abracon	FIXED IND 4.7UH 5A 52 MOHM SMD	963
ATCA-06-132M-H Abracon	FIXED IND 1.3MH 1A 585 MOHM TH	0
AIUR-02H-151K Abracon	FIXED IND 150UH 610MA 270 MOHM	700
AISC-0805-R22G-T Abracon	FIXED IND 220NH 400MA 1.1 OHM	1479
AIRD-03-330K Abracon	FIXED IND 33UH 13.5A 17 MOHM TH	0
AIUR-04-332J Abracon	FIXED IND 3.3MH 100MA 13 OHM TH	0
AIUR-06-390K Abracon	FIXED IND 39UH 3.3A 54 MOHM TH	0
AISC-1210-18NJ-T Abracon	FIXED IND 18NH 1A 100 MOHM SMD	0
AMDLA4020Q-150MT Abracon	FIXED IND 15UH 1.2A 275 MOHM SMD	0
AMDLA1306S-100MT Abracon	IND 10UH 11A 15.8MOHM SMD	500
ASPI-0309-3R3M-T4 Abracon	FIXED IND 3.3UH 820MA 260 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