Fixed Inductors

Part Number	Description / PDF	Quantity
PM4344.472NLT PulseLarsen Antenna	FIXED IND 4.7UH 25A 5.5 MOHM SMD	0
PA4345.331NLT PulseLarsen Antenna	FIXED IND 330NH 12A 7.3 MOHM SMD	0
PM4341.153NLT PulseLarsen Antenna	FIXED IND 15UH 3A 123 MOHM SMD	0
PA4309.103NLT PulseLarsen Antenna	FIXED IND 10UH 11A 52 MOHM SMD	0
PA4308.152NLT PulseLarsen Antenna	FIXED IND 1.5UH 11A 38 MOHM SMD	0
PA4341.151ANLT PulseLarsen Antenna	FIXED IND 150NH 30A 2.1 MOHM SMD	0
PE-52628NL PulseLarsen Antenna	FIXED IND 470UH 900MA 1.26 OHM	999
PA4546.102NLT PulseLarsen Antenna	FIXED IND 1UH 4A 47 MOHM SMD	3766
PA4340.222NLT PulseLarsen Antenna	FIXED IND 2.2UH 5.5A 35 MOHM SMD	8032
PF0504.472NLT PulseLarsen Antenna	FIXED IND 4.7UH 10.8A 6.9 MOHM	0
PA4306.222NLT PulseLarsen Antenna	FIXED IND 2.2UH 5A 45 MOHM SMD	0
PF0601.473NL PulseLarsen Antenna	FIXED IND 47UH 500MA 515 MOHM	0
PA2982.121HL PulseLarsen Antenna	FIXED IND 120NH 62A 0.35 MOHM	4070
P1173.472NLT PulseLarsen Antenna	FIXED IND 4.7UH 7.9A 9.5 MOHM	255
PE-0805CD100JTT PulseLarsen Antenna	FIXED IND 10.2NH 600MA 140 MOHM	0
PA4332.332NLT PulseLarsen Antenna	FIXED IND 3.3UH 3.45A 72 MOHM	0
P0850SNLT PulseLarsen Antenna	FIXED IND 23UH 5A 13 MOHM SMD	0
P0751.223NL PulseLarsen Antenna	FIXED IND 22UH 2.6A 114 MOHM SMD	0
PM2203.472NLT PulseLarsen Antenna	FIXED IND 4.7UH 5.9A 36.3 MOHM	524
PF0560.223NL PulseLarsen Antenna	FIXED IND 22UH 2.5A 73 MOHM SMD	2338

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