Fixed Inductors

Part Number	Description / PDF	Quantity
PA4342.681ANLT PulseLarsen Antenna	FIXED IND 680NH 20A 2.2 MOHM SMD	0
PE-53830SNL PulseLarsen Antenna	FIXED IND 77UH 1.54A 200 MOHM	1266
PA4309.824NLT PulseLarsen Antenna	FIXED IND 820UH 1.2A 3.51 OHM	0
PE-0402CL330JTT PulseLarsen Antenna	FIXED IND 33NH 200MA 800 MOHM	19915
PA4333.682NLT PulseLarsen Antenna	FIXED IND 6.8UH 3.2A 64 MOHM SMD	0
PA1320.171NL PulseLarsen Antenna	FIXED IND 180NH 40A 0.48 MOHM	0
PA4303.123NLT PulseLarsen Antenna	FIXED IND 12UH 3.4A 44 MOHM SMD	0
PA5005.122NLT PulseLarsen Antenna	FIXED IND 1.2UH 18A 5.83MOHM SMD	667
PA1494.162NL PulseLarsen Antenna	FIXED IND 1.6UH 37A 1.8 MOHM SMD	0
PE-0603CD360JTT PulseLarsen Antenna	FIXED IND 36NH 600MA 250 MOHM	0
PA4546.183NLT PulseLarsen Antenna	FIXED IND 18UH 900MA 960 MOHM	0
PF0504.103NLT PulseLarsen Antenna	FIXED IND 10UH 7.1A 15 MOHM SMD	0
P0250.562NLT PulseLarsen Antenna	FIXED IND 5.6UH 5.3A 20 MOHM SMD	0
PA4318.473NLT PulseLarsen Antenna	FIXED IND 47UH 860MA 300 MOHM	0
PE-0805CD331JTT PulseLarsen Antenna	FIXED IND 330NH 310MA 1.4 OHM	0
P1166.124NLT PulseLarsen Antenna	FIXED IND 120UH 530MA 645 MOHM	766
PF0601.473NLT PulseLarsen Antenna	FIXED IND 47UH 500MA 515 MOHM	0
PG0426.201NLT PulseLarsen Antenna	FIXED IND 200NH 26A 2.2 MOHM SMD	2170
PB2020.682NL PulseLarsen Antenna	FIXED IND 6.8UH 13.6A 6.5 MOHM	0
PE-0805CD471GTT PulseLarsen Antenna	FIXED IND 477NH 250MA 1.76 OHM	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