Fixed Inductors

Part Number	Description / PDF	Quantity
PE-0603CD181JTT PulseLarsen Antenna	FIXED IND 180NH 240MA 1.25 OHM	0
PA3779.141HL PulseLarsen Antenna	FIXED IND 140NH 56A 0.29 MOHM	0
PA0511.101NLT PulseLarsen Antenna	FIXED IND 120NH 31A 0.39 MOHM	883
PA5041.331HLT PulseLarsen Antenna	FIXED IND 330NH 22A 0.29 MOHM	3200
PA4390.151HLT PulseLarsen Antenna	FIXED IND 150NH 68A 0.185 MOHM	13383
PA4310.394NLT PulseLarsen Antenna	FIXED IND 390UH 1.7A 1.17 OHM	0
PE-0603CD680JTT PulseLarsen Antenna	FIXED IND 68NH 600MA 340 MOHM	24694
PE-53818NL PulseLarsen Antenna	FIXED IND 252UH 440MA 900 MOHM	0
PG0936.282NLT PulseLarsen Antenna	FIXED IND 2.8UH 24A 2.2 MOHM SMD	0
PA4342.682ANLT PulseLarsen Antenna	FIXED IND 6.8UH 6.8A 24.5 MOHM	0
P1168.162NLT PulseLarsen Antenna	FIXED IND 1.6UH 8.5A 6.3 MOHM	511
P1167.103NLT PulseLarsen Antenna	FIXED IND 10UH 2A 50 MOHM SMD	2154
PG0926.461NL PulseLarsen Antenna	FIXED IND 460NH 44A 0.55 MOHM	0
PA0511.101NL PulseLarsen Antenna	FIXED IND 120NH 31A 0.39 MOHM	0
PM4341.161NLT PulseLarsen Antenna	FIXED IND 160NH 27A 1.9 MOHM SMD	0
PM4346.501NLT PulseLarsen Antenna	FIXED IND 500NH 37A 1.3 MOHM SMD	0
PM4343.472NLT PulseLarsen Antenna	FIXED IND 4.7UH 13.5A 8.4 MOHM	0
PA4309.152NLT PulseLarsen Antenna	FIXED IND 1.5UH 20A 22 MOHM SMD	0
PA4336.473NLT PulseLarsen Antenna	FIXED IND 47UH 440MA 923 MOHM	2850
PA4304.184NLT PulseLarsen Antenna	FIXED IND 180UH 900MA 290 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