Fixed Inductors

Part Number	Description / PDF	Quantity
ASPI-0410FS-4R7M-T35 Abracon	FIXED IND 4.7UH 900MA 210 MOHM	0
AMPLA1004S-R39MT Abracon	FIXED IND 390NH 30A 1.3 MOHM SMD	0
AIML-1206-1R2K-T Abracon	FIXED IND 1.2UH 100MA 400 MOHM	0
AIUR-15-221K Abracon	FIXED IND 220UH 2.3A 160 MOHM TH	0
AISC-0603HP-56NJ-T Abracon	FIXED IND 56NH 700MA 230 MOHM	0
AIUR-07-470K Abracon	FIXED IND 47UH 570MA 320 MOHM TH	0
AMPLA5030Q-R25MT Abracon	FIXED IND 250NH 15A 4.1 MOHM SMD	0
AMDLA2213S-4R7MT Abracon	IND 4.7UH 34A 2.2MOHM SMD	0
AMPLA1004S-3R3MT Abracon	FIXED IND 3.3UH 11A 11.8 MOHM	0
AISC-1008F-5R6G-T Abracon	FIXED IND 5.6UH 380MA 2.65 OHM	0
ASPI-0403S-222M-T Abracon	FIXED IND 2.2MH 100MA 8.5 OHM	12254
AISC-1008-2R7G-T Abracon	FIXED IND 2.7UH 290MA 3.2 OHM	4263
ASPIAIG-S4035-1R0M-T Abracon	FIXED IND 1UH 4.5A 24MOHM SMD	1690
ASPI-6045S-470M-T Abracon	FIXED IND 47UH 1.2A 200 MOHM SMD	1231
AISC-0805-R56G-T Abracon	FIXED IND 560NH 230MA 1.9 OHM	135
ASPIAIG-F4020-R36M-T Abracon	FIXED IND 360NH 14.5A 6.3 MOHM	0
AMELA2012S-1R5MT Abracon	IND 1.5UH 2.9A 60MOHM SMD	3000
AMDLA2213Q-330MT Abracon	FIXED IND 33UH 16A 15.4 MOHM SMD	0
AIUR-04-101J Abracon	FIXED IND 100UH 200MA 2 OHM TH	0
AISC-0805-R12G-T Abracon	FIXED IND 120NH 400MA 510 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