Fixed Inductors

Part Number	Description / PDF	Quantity
PA4345.681NLT PulseLarsen Antenna	FIXED IND 680NH 10A 12.4 MOHM	0
PE-0402CL820JTT PulseLarsen Antenna	FIXED IND 82NH 150MA 2.4OHM SMD	19900
PA4303.473NLT PulseLarsen Antenna	FIXED IND 47UH 1.8A 166 MOHM SMD	0
PA4341.151NLT PulseLarsen Antenna	FIXED IND 150NH 27A 1.9 MOHM SMD	0
PM4343.451NLT PulseLarsen Antenna	FIXED IND 450NH 42A 1.2 MOHM SMD	0
PA1294.152NLT PulseLarsen Antenna	FIXED IND 1.5UH 21A 0.48 MOHM	0
PA4310.822NLT PulseLarsen Antenna	FIXED IND 8.2UH 13A 36 MOHM SMD	0
P0846SNL PulseLarsen Antenna	FIXED IND 14.8UH 5A 27 MOHM SMD	2335
PE-54038NL PulseLarsen Antenna	FIXED IND 77UH 2.7A 90 MOHM TH	578
PA4343.221NLT PulseLarsen Antenna	FIXED IND 220NH 53A 0.6 MOHM SMD	0
PA4301.682NLT PulseLarsen Antenna	FIXED IND 6.8UH 1.88A 46.8 MOHM	0
PE-51508NL PulseLarsen Antenna	FIXED IND 60UH 16A 12 MOHM TH	0
PE-53803NL PulseLarsen Antenna	FIXED IND 118UH 200MA 1.8 OHM TH	0
PA4305.152NLT PulseLarsen Antenna	FIXED IND 1.5UH 5.5A 45 MOHM SMD	0
PA4319.333NLT PulseLarsen Antenna	FIXED IND 33UH 1.04A 124 MOHM	0
PA4346.221ANLT PulseLarsen Antenna	FIXED IND 220NH 50A 0.61 MOHM	0
PA5005.152NLT PulseLarsen Antenna	FIXED IND 1.5UH 17A 6.3MOHM SMD	671
PA5002.331NLT PulseLarsen Antenna	FIXED IND 330NH 14.4A 7MOHM SMD	2995
PA4344.153NLT PulseLarsen Antenna	FIXED IND 15UH 12.5A 20.5 MOHM	0
PE-53821SNLT PulseLarsen Antenna	FIXED IND 78UH 820MA 300 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