Fixed Inductors

Part Number	Description / PDF	Quantity
PA4343.333ANLT PulseLarsen Antenna	FIXED IND 33UH 6.5A 55 MOHM SMD	0
PA4338.334NLT PulseLarsen Antenna	FIXED IND 330UH 640MA 889 MOHM	19
PA4306.823NLT PulseLarsen Antenna	FIXED IND 82UH 800MA 1.053 OHM	0
P1173.472NL PulseLarsen Antenna	FIXED IND 4.7UH 7.9A 9.5 MOHM	0
PA4335.471NLT PulseLarsen Antenna	FIXED IND 470NH 3.45A 35 MOHM	0
PA5002.821NLT PulseLarsen Antenna	FIXED IND 820NH 12A 12.7MOHM SMD	3000
PA4546.682NLT PulseLarsen Antenna	FIXED IND 6.8UH 1.5A 360 MOHM	0
PA4340.102NLT PulseLarsen Antenna	FIXED IND 1UH 7A 14 MOHM SMD	2360
PA4309.564NLT PulseLarsen Antenna	FIXED IND 560UH 1.45A 2.241 OHM	0
PA4343.681NLT PulseLarsen Antenna	FIXED IND 680NH 35A 1.5 MOHM SMD	0
PA4318.153NLT PulseLarsen Antenna	FIXED IND 15UH 1.42A 106 MOHM	0
PA5433.302NLT PulseLarsen Antenna	IND COMPOSITE 1580 3.0UH 34.5A	0
PG0426.152NL PulseLarsen Antenna	FIXED IND 1.5UH 9A 11.8 MOHM SMD	0
PA4334.682NLT PulseLarsen Antenna	FIXED IND 6.8UH 980MA 247 MOHM	0
PE-1008CD331GTT PulseLarsen Antenna	FIXED IND 330NH 450MA 1.05 OHM	0
PM4341.182NLT PulseLarsen Antenna	FIXED IND 1.8UH 8.5A 17 MOHM SMD	0
PA5187.121HLT PulseLarsen Antenna	FIXED IND 120NH 67A 0.12 MOHM	0
PA4344.103NLT PulseLarsen Antenna	FIXED IND 10UH 16.5A 13 MOHM SMD	0
PA4342.223ANLT PulseLarsen Antenna	FIXED IND 22UH 4.1A 66 MOHM SMD	3919
PE-53634NL PulseLarsen Antenna	FIXED IND 50UH 2.6A 133 MOHM SMD	776

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