Fixed Inductors

Image	Part Number	Description / PDF	Quantity	Rfq
	P3519-473K API Delevan	FIXED IND 47UH 580MA 890 MOHM	0
	HF1008R-082J API Delevan	FIXED IND 8.2NH 1.275A 75 MOHM	0
	1812R-181K API Delevan	FIXED IND 180NH 757MA 350 MOHM	0
	1210-682G API Delevan	FIXED IND 6.8UH 321MA 1.8 OHM	0
	S1210-123J API Delevan	FIXED IND 12UH 277MA 2.1 OHM SMD	0
	0819-90H API Delevan	FIXED IND 560UH 28MA 60 OHM TH	0
	P1812-154G API Delevan	FIXED IND 150UH 140MA 6.432 OHM	0
	P3519R-392J API Delevan	FIXED IND 3.9UH 1.68A 104 MOHM	0
	5022-512G API Delevan	FIXED IND 5.1UH 1.04A 300 MOHM	0
	P3519-222K API Delevan	FIXED IND 2.2UH 2.47A 50 MOHM	0
	S1812-272K API Delevan	FIXED IND 2.7UH 638MA 490 MOHM	0
	S1008R-182F API Delevan	FIXED IND 1.8UH 435MA 600 MOHM	0
	HF1008-471K API Delevan	FIXED IND 470NH 310MA 1.55 OHM	0
	103-470M API Delevan	FIXED IND 47NH 820MA 145 MOHM	0
	HF1008R-751J API Delevan	FIXED IND 750NH 275MA 1.95 OHM	0
	S1210-821G API Delevan	FIXED IND 820NH 565MA 600 MOHM	0
	2474-25L API Delevan	FIXED IND 100UH 1.3A 208 MOHM TH	0
	5022R-301G API Delevan	FIXED IND 300NH 2.14A 80 MOHM	0
	2474-12L API Delevan	FIXED IND 8.2UH 3.55A 28 MOHM TH	0
	S1008R-472G API Delevan	FIXED IND 4.7UH 305MA 1.2 OHM	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