Fixed Inductors

Part Number	Description / PDF	Quantity
AIUR-09-121K Abracon	FIXED IND 120UH 1.1A 420 MOHM TH	0
ASPI-8040S-270M-T Abracon	FIXED IND 27UH 2A 78 MOHM SMD	1770
AIUR-03-120K Abracon	FIXED IND 12UH 1.9A 50 MOHM TH	0
ASPIAIG-H6530-2R2M-T Abracon	FIXED IND 2.2UH 8A 18 MOHM SMD	911
AISC-1008F-1R8G-T Abracon	FIXED IND 1.8UH 600MA 840 MOHM	0
AMDLA2213S-470MT Abracon	IND 47UH 10A 20.8MOHM SMD	0
ATCA-08-251M-H Abracon	FIXED IND 250UH 10A 27 MOHM TH	2206
AIAP-01-102K-T Abracon	FIXED IND 1MH 160MA 7.9 OHM TH	0
AISC-1008HQ-12NJ-T Abracon	FIXED IND 12NH 1.5A 60 MOHM SMD	0
AIMC-0805-27NJ-T Abracon	FIXED IND 27NH 300MA 550 MOHM	2581
AISC-0603HP-15NJ-T Abracon	FIXED IND 15NH 1.1A 85 MOHM SMD	513
AIMC-0805-47NJ-T Abracon	FIXED IND 47NH 300MA 700 MOHM	3050
ASPI-6045S-1R2N-T Abracon	FIXED IND 1.2UH 5.4A 10 MOHM SMD	819
AMDLA4020S-R33MT Abracon	IND 0.33UH 11A 8.4MOHM SMD	0
ASPI-4020S-750M-T Abracon	FIXED IND 75UH 350MA 1.16 OHM	0
AIMC-0201-18NJ-T Abracon	FIXED IND 18NH 100MA 1.3 OHM SMD	18679
ASPI-4030S-6R8M-T Abracon	FIXED IND 6.8UH 1.6A 90 MOHM SMD	2763
AIRD-06-152K Abracon	FIXED IND 1.5MH 800MA 1.26 OHM	0
ASPI-0602S-7R3M-T Abracon	FIXED IND 7.3UH 2.1A 54 MOHM SMD	0
AIUR-08-271K Abracon	FIXED IND 270UH 1A 400 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