Fixed Inductors

Part Number	Description / PDF	Quantity
HF1008R-222H API Delevan	FIXED IND 2.2UH 300MA 1.65 OHM	0
S1812R-124F API Delevan	FIXED IND 120UH 163MA 7.5 OHM	0
1210R-222F API Delevan	FIXED IND 2.2UH 431MA 1 OHM SMD	0
5500R-476K API Delevan	FIXED IND 47MH 170MA 33.7 OHM	1
8532-31L API Delevan	FIXED IND 330UH 740MA 650 MOHM	0
5022-683F API Delevan	FIXED IND 68UH 320MA 3.3 OHM SMD	0
1812-183H API Delevan	FIXED IND 18UH 268MA 2.8 OHM SMD	0
1812-393G API Delevan	FIXED IND 39UH 211MA 4.5 OHM SMD	0
1210-101G API Delevan	FIXED IND 100NH 1.018A 200 MOHM	0
M83446/39-34F API Delevan	FIXED IND 5.6UH 427MA 1.1 OHM	969
8532R-10K API Delevan	FIXED IND 5.6UH 3.84A 24 MOHM	0
1210-332F API Delevan	FIXED IND 3.3UH 393MA 1.2 OHM	0
103-121GS API Delevan	FIXED IND 120NH 880MA 125 MOHM	0
1210-047K API Delevan	FIXED IND 4.7NH 1.562A 50 MOHM	0
4922R-221L API Delevan	FIXED IND 220NH 7A 8 MOHM SMD	3026
5022-473F API Delevan	FIXED IND 47UH 351MA 2.75 OHM	0
103-122FS API Delevan	FIXED IND 1.2UH 360MA 740 MOHM	0
DC780R-124K API Delevan	FIXED IND 120UH 4A 90 MOHM TH	0
HF1008R-471G API Delevan	FIXED IND 470NH 310MA 1.55 OHM	0
1210R-682H API Delevan	FIXED IND 6.8UH 321MA 1.8 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