Fixed Inductors

Part Number	Description / PDF	Quantity
P0752.334NLT PulseLarsen Antenna	FIXED IND 330UH 600MA 1.02 OHM	9056
PA3779.351HLT PulseLarsen Antenna	FIXED IND 350NH 25A 0.29 MOHM	0
PE-0603CD150GTT PulseLarsen Antenna	FIXED IND 15NH 700MA 170 MOHM	7307
PM4343.821NLT PulseLarsen Antenna	FIXED IND 820NH 33A 1.9 MOHM SMD	0
PM4343.301NLT PulseLarsen Antenna	FIXED IND 300NH 48A 0.72 MOHM	0
PA4990.151HLT PulseLarsen Antenna	FIXED IND 150NH 77A 0.125 MOHM	22896390
PA4343.473NLT PulseLarsen Antenna	FIXED IND 47UH 6.5A 90 MOHM SMD	0
P1167.154NL PulseLarsen Antenna	FIXED IND 150UH 520MA 610 MOHM	0
P1167.123NLT PulseLarsen Antenna	FIXED IND 12UH 1.9A 57 MOHM SMD	1851
PE-0805CD680GTT PulseLarsen Antenna	FIXED IND 67.8NH 500MA 380 MOHM	0
PE-92102KNL PulseLarsen Antenna	FIXED IND 100UH 2.6A 100 MOHM TH	908
P1252.472NL PulseLarsen Antenna	FIXED IND 4.7UH 8.4A 14 MOHM SMD	0
PE-54044SNLT PulseLarsen Antenna	FIXED IND 77UH 3A 80 MOHM SMD	0
PA4306.822NLT PulseLarsen Antenna	FIXED IND 8.2UH 2.4A 130 MOHM	0
PA4318.104NLT PulseLarsen Antenna	FIXED IND 100UH 540MA 660 MOHM	0
P0250.473NL PulseLarsen Antenna	FIXED IND 47UH 2.6A 86 MOHM SMD	0
PA4340.201ANLT PulseLarsen Antenna	FIXED IND 200NH 18A 2.8 MOHM SMD	0
PE-54041SNL PulseLarsen Antenna	FIXED IND 25UH 3A 40 MOHM SMD	103
PA4334.333NLT PulseLarsen Antenna	FIXED IND 33UH 360MA 1.138 OHM	0
P0250.684NLT PulseLarsen Antenna	FIXED IND 680UH 720MA 1.1 OHM	413

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