Fixed Inductors

Part Number	Description / PDF	Quantity
ASPI-6045S-331M-T Abracon	FIXED IND 330UH 570MA 1.27 OHM	6093
AISC-0603HP-75NJ-T Abracon	FIXED IND 75NH 550MA 420 MOHM	0
AMDLA4020S-1R5MT Abracon	IND 1.5UH 4.8A 26MOHM SMD	3000
AIUR-06-332K Abracon	FIXED IND 3.3MH 350MA 3.7 OHM TH	0
AIAP-03-470K Abracon	FIXED IND 47UH 3.98A 35 MOHM TH	19807
AMDLA7030Q-2R2MT Abracon	FIXED IND 2.2UH 7.5A 15 MOHM SMD	975
ASPIAIG-F1040-R22M-T Abracon	FIXED IND 220NH 35A 1 MOHM SMD	0
AIRD-06-1R8M Abracon	FIXED IND 1.8UH 11.4A 3 MOHM TH	0
AIML-1206-R27K-T Abracon	FIXED IND 270NH 250MA 400 MOHM	22235
AIML-0603-180K-T Abracon	FIXED IND 18UH 1MA 1.85 OHM SMD	215
AMDLA4530S-R12NT Abracon	IND 0.12UH 30A 2.3MOHM SMD	0
ASPIAIG-S4035-470M-T Abracon	FIXED IND 47UH 900MA 590MOHM SMD	0
AIUR-05-151K Abracon	FIXED IND 150UH 460MA 400 MOHM	0
AIUR-15-181K Abracon	FIXED IND 180UH 2.5A 130 MOHM TH	0
AMDLA3020S-R33MT Abracon	IND 0.33UH 9A 15MOHM SMD	0
ASPI-0310FS-4R7M-T2 Abracon	FIXED IND 4.7UH 1.7A 175 MOHM	300
AISC-1008-R047G-T Abracon	FIXED IND 47NH 1A 160 MOHM SMD	56
AIUR-12-331K Abracon	FIXED IND 330UH 380MA 1.21 OHM	0
AIAP-02-5R6K Abracon	FIXED IND 5.6UH 5.6A 24 MOHM TH	6464
ASPIAIG-F4020-1R2M-T Abracon	FIXED IND 1.2UH 9A 17.9 MOHM SMD	2995

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