Fixed Inductors

Part Number	Description / PDF	Quantity
AIUR-03-3R3M Abracon	FIXED IND 3.3UH 2.9A 25 MOHM TH	0
AIMC-0805-39NJ-T Abracon	FIXED IND 39NH 300MA 650 MOHM	7049
AIAC-1512C-12N5J-T Abracon	FIXED IND 12.5NH 4.3A 3 MOHM SMD	1928
AISC-0603HP-4N7B-T Abracon	FIXED IND 4.7NH 1.1A 90 MOHM SMD	2865
AMDLA4020Q-R68MT Abracon	FIXED IND 680NH 7A 13.5 MOHM SMD	3000
AISC-0402HP-51NJ-T Abracon	FIXED IND 51NH 360MA 750 MOHM	0
AISR-875-270M Abracon	FIXED IND 27UH 1.7A 110 MOHM TH	0
AMPLA7050S-100MT Abracon	FIXED IND 10UH 4A 69 MOHM SMD	754
ASPI-0309-2R2M-T4 Abracon	FIXED IND 2.2UH 1A 170 MOHM SMD	0
AISM-1210-1R5K-T Abracon	FIXED IND 1.5UH 370MA 850 MOHM	0
AISM-1210-R68M-T Abracon	FIXED IND 680NH 450MA 600 MOHM	0
ASPI-0504-180K-T Abracon	FIXED IND 18UH 1.23A 150 MOHM	0
AIUR-06-470K Abracon	FIXED IND 47UH 3.2A 63 MOHM TH	1006
AIAP-03-120K Abracon	FIXED IND 12UH 8.21A 20 MOHM TH	0
AIMC-0402HQ-3N3C-T Abracon	FIXED IND 3.3NH 700MA 90 MOHM	14376
ASPI-0410FS-220M-T35 Abracon	FIXED IND 22UH 360MA 870 MOHM	4983
ASPIAIG-F1040-6R2M-T Abracon	FIXED IND 6.2UH 8.7A 21.3 MOHM	917
AMDLA1306Q-220MT Abracon	FIXED IND 22UH 8A 35 MOHM SMD	0
AIAP-02-682K Abracon	FIXED IND 6.8MH 150MA 16.3 OHM	0
ASPI-2512-R47N-T2 Abracon	FIXED IND 470NH 2.15A 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