Fixed Inductors

Part Number	Description / PDF	Quantity
744373360068 Würth Elektronik Midcom	FIXED IND 680NH 8A 12 MOHM SMD	0
SRU2011-100Y J.W. Miller / Bourns	FIXED IND 10UH 520MA 740MOHM SMD	0
8532-35L API Delevan	FIXED IND 680UH 490MA 1.5 OHM	0
PE-1008CD221GTT PulseLarsen Antenna	FIXED IND 220NH 500MA 840 MOHM	0
IHLP6767GZER470M11 Vishay / Dale	FIXED IND 47UH 8.7A 42.7 MOHM	6741
0402HP-2N4ECTS Delta Electronics	FIXED IND 2.4NH 2A 42 MOHM SMD	7765
103-822G API Delevan	FIXED IND 8.2UH 195MA 2.5 OHM	0
SWS-1.50-250 Amgis	FIXED IND 250UH 1.5A 230 MOHM	0
IHLP2525BDER8R2M01 Vishay / Dale	FIXED IND 8.2UH 3A 106 MOHM SMD	0
CBL2012T2R2M TAIYO YUDEN	FIXED IND 2.2UH 590MA 507 MOHM	19990
SPM10040T-1R0M TDK Corporation	FIXED IND 1UH 15A 4.2 MOHM SMD	1212
MHQ0603P4N2ST000 TDK Corporation	FIXED IND 4.2NH 400MA 350 MOHM	0
VLP5610T-220MR45 TDK Corporation	FIXED IND 22UH 450MA 960 MOHM	3867
LQW15AN7N8J80D TOKO / Murata	FIXED IND 7.8NH 1.7A 50 MOHM SMD	0
SM2518-1R5MHF ITG Electronics, Inc.	1.5UH, 20%, 8.6MOHM, 14AMP MAX.	0
LQW2BHN3N3D03L TOKO / Murata	FIXED IND 3.3NH 910MA 50 MOHM	0
BSPQ000603046N8H00 Chilisin Electronics	THIN FILM RF INDUCTOR,HIGH Q	0
ISC1210BN220K Vishay / Dale	FIXED IND 22UH 150MA 3.1 OHM SMD	0
ISC1812EB2R7K Vishay / Dale	FIXED IND 2.7UH 378MA 490 MOHM	0
S1008R-621J API Delevan	FIXED IND 620NH 770MA 190 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