Fixed Inductors

Part Number	Description / PDF	Quantity
ASPI-2512-100M-T2 Abracon	FIXED IND 10UH 590MA 630 MOHM	0
AISM-1812-681K-T Abracon	FIXED IND 680UH 50MA 30 OHM SMD	0
AISM-1210-330K-T Abracon	FIXED IND 33UH 70MA 5.6 OHM SMD	0
AMPLA4012Q-1R0MT Abracon	FIXED IND 1UH 4A 47 MOHM SMD	0
ASPIAIG-S8050-151M-T Abracon	FIXED IND 150UH 1A 480 MOHM SMD	71
AISC-0402-11NJ-T Abracon	FIXED IND 11NH 640MA 120 MOHM	7660
AISC-0603-R015J-T Abracon	FIXED IND 15NH 550MA 150 MOHM	450
AIUR-10-470K Abracon	FIXED IND 47UH 1.16A 230 MOHM TH	0
AIUR-06-121K Abracon	FIXED IND 120UH 2A 127 MOHM TH	445
AISC-0603-R22J-T Abracon	FIXED IND 220NH 140MA 2.1 OHM	0
ASPI-3012S-101M-T Abracon	FIXED IND 100UH 250MA 2.86 OHM	2696
AISM-1210-120K-T Abracon	FIXED IND 12UH 140MA 2.5 OHM SMD	0
AISC-0805-R027J-T Abracon	FIXED IND 27NH 500MA 250 MOHM	937
ATFC-0402-6N8B-T Abracon	FIXED IND 6.8NH 260MA 1.05 OHM	0
AMPLA7030Q-150MT Abracon	FIXED IND 15UH 3A 123 MOHM SMD	0
ASPIAIG-F5020-R33M-T Abracon	FIXED IND 330NH 14.4A 7 MOHM SMD	3000
ATFC-0201HQ-0N4B-T Abracon	FIXED IND 0.4NH 750MA 50 MOHM	0
ASPIAIG-F7030-6R8M-T Abracon	FIXED IND 6.8UH 6.8A 42.5 MOHM	1465
AMPLA1707S-220MT Abracon	FIXED IND 22UH 12A 26.5 MOHM SMD	0
ATFC-0402-3N5B-T Abracon	FIXED IND 3.5NH 380MA 550 MOHM	12350

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