Fixed Inductors

Part Number	Description / PDF	Quantity
PA4310.684NLT PulseLarsen Antenna	FIXED IND 680UH 1.4A 1.999 OHM	0
MGV0312R68M-10 Laird - Performance Materials	FIXED IND 680NH 4A 40MOHM SMD	8000
MGV17071R5M-10 Laird - Performance Materials	FIXED IND 1.5UH 47A 2.5MOHM SMD	0
IHLP5050CEER2R2M01 Vishay / Dale	FIXED IND 2.2UH 16A 8 MOHM SMD	8937
BWCS001207071N9B00 Chilisin Electronics	FIXED IND 1.9NH 1.04A 70MOHM SMD	3834
ISC1812RV180J Vishay / Dale	FIXED IND 18UH 238MA 1.24 OHM	0
LQP03TN4N7J02D TOKO / Murata	FIXED IND 4.7NH 350MA 400 MOHM	12400
LQW2UASR15F0CL TOKO / Murata	FIXED IND 150NH 580MA 700 MOHM	1985
CM453232-681KL J.W. Miller / Bourns	FIXED IND 680UH 50MA 30 OHM SMD	1009
7447785004 Würth Elektronik Midcom	FIXED IND 4.7UH 2.65A 78 MOHM	2892
NLV32T-022J-PF TDK Corporation	FIXED IND 22NH 450MA 200 MOHM	1221
B82422H1332J000 TDK EPCOS	FIXED IND 3.3UH 770MA 180 MOHM	75
1410516C Murata Power Solutions	FIXED IND 1MH 1.6A 460 MOHM TH	776
B82442T1684K050 TDK EPCOS	FIXED IND 680UH 210MA 5.87 OHM	0
SRR0735A-390M J.W. Miller / Bourns	FIXED IND 39UH 950MA 250MOHM SMD	0
AMDLA2213Q-230MT Abracon	FIXED IND 23UH 18A 11 MOHM SMD	0
SP1008R-823K API Delevan	FIXED IND 82UH 107MA 9.9 OHM SMD	0
IMC1812EB1R5J Vishay / Dale	FIXED IND 1.5UH 410MA 600 MOHM	0
1210-033K API Delevan	FIXED IND 3.3NH 1.562A 50 MOHM	0
MPX1D1235LR68 KEMET	FIXED IND 680NH 25.9A 2.9 MOHM	500

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