Fixed Inductors

Part Number	Description / PDF	Quantity
P1330-682J API Delevan	FIXED IND 6.8UH 1.08A 165 MOHM	0
SP1210-222G API Delevan	FIXED IND 2.2UH 992MA 211 MOHM	0
8532-24H API Delevan	FIXED IND 82UH 1.53A 152 MOHM	0
HF1008R-911G API Delevan	FIXED IND 910NH 270MA 2.05 OHM	0
2500-12J API Delevan	FIXED IND 470UH 108MA 11 OHM TH	1238
P1330R-184J API Delevan	FIXED IND 180UH 261MA 2.4 OHM	0
S1812R-473J API Delevan	FIXED IND 47UH 242MA 3.4 OHM SMD	0
HF1008R-392F API Delevan	FIXED IND 3.9UH 275MA 1.95 OHM	0
0819-68J API Delevan	FIXED IND 68UH 64MA 11.5 OHM TH	0
1008-100K API Delevan	FIXED IND 10NH 1.562A 50 MOHM	0
HF1008-820J API Delevan	FIXED IND 82NH 390MA 800 MOHM	0
1025R-14K API Delevan	FIXED IND 560NH 550MA 500 MOHM	1581
5022R-272H API Delevan	FIXED IND 2.7UH 550MA 1.2 OHM	0
1812-184H API Delevan	FIXED IND 180UH 145MA 9.5 OHM	0
HF1008R-911F API Delevan	FIXED IND 910NH 270MA 2.05 OHM	0
2474-32L API Delevan	FIXED IND 390UH 680MA 770 MOHM	0
8532-49J API Delevan	FIXED IND 10MH 120MA 23.4 OHM	0
103-183F API Delevan	FIXED IND 18UH 130MA 5.8 OHM SMD	0
4590-822K API Delevan	FIXED IND 8.2UH 7.15A 13 MOHM TH	0
1812-270K API Delevan	FIXED IND 27NH 1A 150 MOHM SMD	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