Fixed Inductors

Part Number	Description / PDF	Quantity
1812-101F API Delevan	FIXED IND 100NH 818MA 300 MOHM	0
SP1210-821H API Delevan	FIXED IND 820NH 1.25A 133 MOHM	0
0819-46F API Delevan	FIXED IND 8.2UH 104MA 4.4 OHM TH	0
SP1812R-562J API Delevan	FIXED IND 5.6UH 920MA 240 MOHM	0
103-183H API Delevan	FIXED IND 18UH 130MA 5.8 OHM SMD	0
S1812-221K API Delevan	FIXED IND 220NH 1.154A 150 MOHM	0
0819-26F API Delevan	FIXED IND 1.2UH 410MA 280 MOHM	0
5022-113H API Delevan	FIXED IND 11UH 565MA 1.05 OHM	0
HF1008-472G API Delevan	FIXED IND 4.7UH 273MA 2 OHM SMD	0
5022-753J API Delevan	FIXED IND 75UH 302MA 3.7 OHM SMD	0
4922-22L API Delevan	FIXED IND 56UH 1A 397 MOHM SMD	0
ER1025-36KR API Delevan	FIXED IND 4.7UH 230MA 1.2 OHM TH	0
SP1812R-682H API Delevan	FIXED IND 6.8UH 878MA 260 MOHM	0
S1210-181G API Delevan	FIXED IND 180NH 934MA 220 MOHM	0
1210R-563H API Delevan	FIXED IND 56UH 152MA 8 OHM SMD	0
5022-394J API Delevan	FIXED IND 390UH 149MA 16.3 OHM	0
5022R-364F API Delevan	FIXED IND 360UH 171MA 12.5 OHM	0
8532-39K API Delevan	FIXED IND 1.5MH 340MA 3 OHM SMD	0
1210R-683H API Delevan	FIXED IND 68UH 144MA 9 OHM SMD	0
S1210R-104K API Delevan	FIXED IND 100UH 127MA 10 OHM SMD	8898

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