Fixed Inductors

Part Number	Description / PDF	Quantity
PA4322.222NLT PulseLarsen Antenna	FIXED IND 2.2UH 2.08A 20 MOHM	0
PA0431LNL PulseLarsen Antenna	FIXED IND 7.8UH 20.5A 5.5 MOHM	2754
PA4308.105NLT PulseLarsen Antenna	FIXED IND 1MH 360MA 17.55 OHM	0
PA3784.181HLT PulseLarsen Antenna	FIXED IND 180NH 55A 0.18 MOHM	0
PD0120.702NL PulseLarsen Antenna	FIXED IND 7.2UH 8.6A 10 MOHM SMD	0
PA4990.331HLT PulseLarsen Antenna	FIXED IND 330NH 32A 0.125 MOHM	3510
PM4340.681NLT PulseLarsen Antenna	FIXED IND 680NH 8.5A 12 MOHM SMD	0
PB2020.332NL PulseLarsen Antenna	FIXED IND 3.3UH 18.3A 3.9 MOHM	0
PF0580.103NLT PulseLarsen Antenna	FIXED IND 10UH 1.1A 132 MOHM SMD	0
PE-53146NL PulseLarsen Antenna	FIXED IND 330UH 900MA 180 MOHM	909
PA4344.822NLT PulseLarsen Antenna	FIXED IND 8.2UH 18A 10.8 MOHM	0
PM4341.561NLT PulseLarsen Antenna	FIXED IND 560NH 16.5A 5 MOHM SMD	0
PA4309.104NLT PulseLarsen Antenna	FIXED IND 100UH 3.5A 405 MOHM	2955
PA5007.682NLT PulseLarsen Antenna	FIXED IND 6.8UH 6.8A 42.5 MOHM	948
PA3779.241HLT PulseLarsen Antenna	FIXED IND 240NH 37A 0.29 MOHM	0
PM4547.472NLT PulseLarsen Antenna	FIXED IND 4.7UH 1.9A 264 MOHM	2975
P1170.105NLT PulseLarsen Antenna	FIXED IND 1MH 460MA 1.75 OHM SMD	0
PA4320.104NLT PulseLarsen Antenna	FIXED IND 100UH 2.8A 125 MOHM	0
PE-0402CD1N2JTT PulseLarsen Antenna	FIXED INDUCTOR 1.2NH SMD	0
P0752.104NL PulseLarsen Antenna	FIXED IND 100UH 1.2A 380 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