Fixed Inductors

Part Number	Description / PDF	Quantity
AIUR-06-331K Abracon	FIXED IND 330UH 1.3A 394 MOHM TH	258
ASPIAIG-F1040-470M-T Abracon	FIXED IND 47UH 3A 167 MOHM SMD	128
AISC-0805-R068J-T Abracon	FIXED IND 68NH 500MA 380 MOHM	0
ATCA-04-101M-V Abracon	FIXED IND 100UH 5A 33 MOHM TH	0
AMPLA1707Q-330MT Abracon	FIXED IND 33UH 10.7A 44 MOHM SMD	0
AISC-0603-R0095G-T Abracon	FIXED IND 9.5NH 540MA 160 MOHM	0
AMDLA1004Q-8R2MT Abracon	FIXED IND 8.2UH 7.6A 28 MOHM SMD	0
AIRD-01-5R6M Abracon	FIXED IND 5.6UH 9A 7 MOHM TH	0
AMPLA4020S-1R0MT Abracon	FIXED IND 1UH 5A 27 MOHM SMD	5988
ASPI-8040S-150M-T Abracon	FIXED IND 15UH 2.6A 47 MOHM SMD	1067
AIUR-06-820K Abracon	FIXED IND 82UH 2.2A 88 MOHM TH	0
ATFC-0402-2N5B-T Abracon	FIXED IND 2.5NH 440MA 350 MOHM	0
ASPIAIG-S4035-6R8M-T Abracon	FIXED IND 6.8UH 2.2A 101MOHM SMD	1615
ATFC-0201HQ-0N8B-T Abracon	FIXED IND 0.8NH 600MA 100 MOHM	0
ASPI-0403S-682M-T Abracon	FIXED IND 6.8MH 40MA 25 OHM SMD	23051
ASPIAIG-S8050-101M-T Abracon	FIXED IND 100UH 1.25A 326 MOHM	885
AIAP-02-560K Abracon	FIXED IND 56UH 1.7A 131 MOHM TH	0
AMPLA1004S-R75MT Abracon	FIXED IND 750NH 22A 2.7 MOHM SMD	0
AIRD-02-2R7M Abracon	FIXED IND 2.7UH 11.4A 5 MOHM TH	0
AIUR-10-270K Abracon	FIXED IND 27UH 1.59A 140 MOHM TH	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