Fixed Inductors

Part Number	Description / PDF	Quantity
0819-00K API Delevan	FIXED IND 100NH 895MA 130 MOHM	0
5022R-471J API Delevan	FIXED IND 470NH 1.75A 120 MOHM	0
SP1812-183H API Delevan	FIXED IND 18UH 613MA 680 MOHM	0
5022R-133H API Delevan	FIXED IND 13UH 520MA 1.2 OHM SMD	0
HF1008R-122G API Delevan	FIXED IND 1.2UH 320MA 1.45 OHM	0
1210R-039M API Delevan	FIXED IND 3.9NH 1.562A 50 MOHM	0
1812-332J API Delevan	FIXED IND 3.3UH 501MA 800 MOHM	0
SP1210-102J API Delevan	FIXED IND 1UH 1.19A 147 MOHM SMD	0
HF1008-392H API Delevan	FIXED IND 3.9UH 275MA 1.95 OHM	0
SP1812-223J API Delevan	FIXED IND 22UH 509MA 750 MOHM	0
1210-823K API Delevan	FIXED IND 82UH 136MA 10 OHM SMD	0
HF1008R-101K API Delevan	FIXED IND 100NH 375MA 850 MOHM	0
1210R-121J API Delevan	FIXED IND 120NH 971MA 220 MOHM	0
DC630R-104K API Delevan	FIXED IND 100UH 3.21A 95 MOHM TH	1032
S1812R-104K API Delevan	FIXED IND 100UH 169MA 7 OHM SMD	8557
5022R-161H API Delevan	FIXED IND 160NH 3.025A 40 MOHM	0
S1008-273K API Delevan	FIXED IND 27UH 160MA 7 OHM SMD	0
0819-82F API Delevan	FIXED IND 270UH 39MA 30.5 OHM TH	0
5022R-104G API Delevan	FIXED IND 100UH 275MA 4.5 OHM	0
S1210R-393J API Delevan	FIXED IND 39UH 179MA 5 OHM 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