Fixed Inductors

Part Number	Description / PDF	Quantity
1210R-331H API Delevan	FIXED IND 330NH 720MA 400 MOHM	0
P1330-394K API Delevan	FIXED IND 390UH 171MA 5.64 OHM	0
5022-161J API Delevan	FIXED IND 160NH 3.025A 40 MOHM	0
S1210-152F API Delevan	FIXED IND 1.5UH 532MA 570 MOHM	0
SP1210-222J API Delevan	FIXED IND 2.2UH 992MA 211 MOHM	0
SPD62R-224M API Delevan	FIXED IND 220UH 320MA 2.2 OHM	0
S1812R-184F API Delevan	FIXED IND 180UH 153MA 8.5 OHM	0
1330-80K API Delevan	FIXED IND 330UH 45MA 28 OHM SMD	0
P1812R-332G API Delevan	FIXED IND 3.3UH 750MA 323 MOHM	0
1210R-560J API Delevan	FIXED IND 56NH 606MA 330 MOHM	0
1812-103H API Delevan	FIXED IND 10UH 354MA 1.6 OHM SMD	0
1812R-332K API Delevan	FIXED IND 3.3UH 501MA 800 MOHM	0
5022-204G API Delevan	FIXED IND 200UH 219MA 7.1 OHM	0
1210-221F API Delevan	FIXED IND 220NH 805MA 320 MOHM	0
5022-433F API Delevan	FIXED IND 43UH 353MA 2.7 OHM SMD	0
SP1812-104G API Delevan	FIXED IND 100UH 250MA 3.2 OHM	0
HRSPD127-474M API Delevan	FIXED IND 470UH 830MA 800MOHM SM	150
SP1812R-224H API Delevan	FIXED IND 220UH 164MA 7.5 OHM	0
S1210R-391F API Delevan	FIXED IND 390NH 692MA 400 MOHM	0
P3519R-223K API Delevan	FIXED IND 22UH 870MA 390 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