Fixed Inductors

Part Number	Description / PDF	Quantity
PA2202.361NLT PulseLarsen Antenna	FIXED IND 365NH 27A 0.48 MOHM	0
PG0702.601NLT PulseLarsen Antenna	FIXED IND 600NH 32A 0.91 MOHM	0
PM4343.223NLT PulseLarsen Antenna	FIXED IND 22UH 9A 37 MOHM SMD	0
PA4331.332NLT PulseLarsen Antenna	FIXED IND 3.3UH 1.7A 155 MOHM	0
PA4345.122NLT PulseLarsen Antenna	FIXED IND 1.2UH 6.2A 28 MOHM SMD	0
PG0936.183NL PulseLarsen Antenna	FIXED IND 18UH 9.8A 13.8 MOHM	0
PG0702.472NLT PulseLarsen Antenna	FIXED IND 4.7UH 8.4A 5.3 MOHM	0
PE-0603CD270GTT PulseLarsen Antenna	FIXED IND 27NH 600MA 220 MOHM	13409
PM4343.331NLT PulseLarsen Antenna	FIXED IND 330NH 46A 800 MOHM SMD	500
PA4309.223NLT PulseLarsen Antenna	FIXED IND 22UH 7.5A 98 MOHM SMD	0
PA4307.684NLT PulseLarsen Antenna	FIXED IND 680UH 350MA 9.585 OHM	0
PA4304.394NLT PulseLarsen Antenna	FIXED IND 390UH 650MA 690 MOHM	0
PE-0603CD221JTT PulseLarsen Antenna	FIXED IND 220NH 200MA 1.9 OHM	7223
PA2729.203NL PulseLarsen Antenna	FIXED IND 20.7UH 8.5A 12 MOHM	0
PE-0603CD060JTT PulseLarsen Antenna	FIXED IND 6.68NH 700MA 110 MOHM	0
PG0871.922NLT PulseLarsen Antenna	FIXED IND 9.2UH 4.9A 30 MOHM SMD	0
PA0513.441NL PulseLarsen Antenna	FIXED IND 440NH 30A 0.32 MOHM	0
PE-0603CD180GTT PulseLarsen Antenna	FIXED IND 18NH 700MA 170 MOHM	0
PA4301.274NLT PulseLarsen Antenna	FIXED IND 270UH 310MA 1.56 OHM	0
PA4340.153NLT PulseLarsen Antenna	FIXED IND 15UH 2.1A 190 MOHM 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