Fixed Inductors

Part Number	Description / PDF	Quantity
HF1008R-101G API Delevan	FIXED IND 100NH 375MA 850 MOHM	0
HF1008-680J API Delevan	FIXED IND 68NH 550MA 400 MOHM	0
5022R-681F API Delevan	FIXED IND 680NH 1.555A 150 MOHM	0
HF1008-911F API Delevan	FIXED IND 910NH 270MA 2.05 OHM	0
SP1008R-123K API Delevan	FIXED IND 12UH 246MA 1.87 OHM	0
HF1008R-271F API Delevan	FIXED IND 270NH 345MA 1.25 OHM	0
8532-30K API Delevan	FIXED IND 270UH 800MA 557 MOHM	0
2474R-35L API Delevan	FIXED IND 680UH 490MA 1.5 OHM TH	2221
1812-392G API Delevan	FIXED IND 3.9UH 472MA 900 MOHM	0
SP1210-683K API Delevan	FIXED IND 68UH 185MA 6.1 OHM SMD	0
HF1008R-821G API Delevan	FIXED IND 820NH 273MA 2 OHM SMD	0
2474-48L API Delevan	FIXED IND 8.2MH 130MA 20.8 OHM	0
1812-393J API Delevan	FIXED IND 39UH 211MA 4.5 OHM SMD	0
S1008R-181H API Delevan	FIXED IND 180NH 970MA 120 MOHM	0
5022-243J API Delevan	FIXED IND 24UH 368MA 2.5 OHM SMD	0
0819-18J API Delevan	FIXED IND 560NH 510MA 180 MOHM	0
1812-104G API Delevan	FIXED IND 100UH 158MA 8 OHM SMD	0
5022R-273J API Delevan	FIXED IND 27UH 360MA 2.6 OHM SMD	0
P1330-102J API Delevan	FIXED IND 1UH 2.78A 35 MOHM SMD	0
P1330R-152J API Delevan	FIXED IND 1.5UH 2.03A 43 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