Fixed Inductors

Part Number	Description / PDF	Quantity
AISM-1210-330K-T Abracon	FIXED IND 33UH 70MA 5.6 OHM SMD	0
P1330-473G API Delevan	FIXED IND 47UH 467MA 792 MOHM	0
4590-823K API Delevan	FIXED IND 82UH 3.175A 66 MOHM TH	0
B82498F3270J001 TDK EPCOS	FIXED IND 27NH 700MA 90 MOHM SMD	0
4590-476K API Delevan	FIXED IND 47MH 140MA 33.7 OHM TH	0
CD30D22HF-101MC Sumida Corporation	FIXED IND 100UH 300MA 2.79 OHM	0
7441501 Würth Elektronik Midcom	FIXED IND 12UH 14.5A 8 MOHM TH	0
CDEP147NP-2R6MC-73 Sumida Corporation	FIXED IND 2.6UH 16A 4.97 MOHM	0
HCM1A0503V2-1R0-R PowerStor (Eaton)	FIXED IND 1UH 2.8A 11.4MOHM SMD	1884
BRC2518T6R8M TAIYO YUDEN	FIXED IND 6.8UH 680MA 364 MOHM	0
IHLP2525CZERR33M07 Vishay / Dale	FIXED IND 330NH 20A 3.2 MOHM SMD	0
MPL-AL5050-5R6 MPS (Monolithic Power Systems)	FIXED IND 5.6UH 6.8A 20 MOHM SMD	896
1210-271G API Delevan	FIXED IND 270NH 759MA 360 MOHM	0
PE-53828SNL PulseLarsen Antenna	FIXED IND 168UH 1.02A 400 MOHM	697
1217AS-H-6R8N=P3 TOKO / Murata	FIXED IND 6.8UH 4.8A 27.6 MOHM	53
36502A82NJTDG TE Connectivity AMP Connectors	FIXED IND 82NH 400MA 420 MOHM	3
CLF7045T-470M-D TDK Corporation	FIXED IND 47UH 1.2A 180 MOHM SMD	5816
0603DC-7N5XJRW COILCRAFT	CERAMIC CHIP INDUCTORS 7.5NH	4069
IMC1210EB5R6K Vishay / Dale	FIXED IND 5.6UH 217MA 1.6 OHM	0
HFI-100505-8N2J	FIXED IND 8.2NH 300MA 370 MOHM	28230

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