Fixed Inductors

Part Number	Description / PDF	Quantity
PA4320.105NLT PulseLarsen Antenna	FIXED IND 1MH 1A 960 MOHM SMD	0
PG0936.183NLT PulseLarsen Antenna	FIXED IND 18UH 9.8A 13.8 MOHM	0
PM4548.332NLT PulseLarsen Antenna	FIXED IND 3.3UH 6A 39 MOHM SMD	1500
PA4303.823NLT PulseLarsen Antenna	FIXED IND 82UH 1.35A 243 MOHM	0
PM4546.221NLT PulseLarsen Antenna	FIXED IND 220NH 8.5A 8 MOHM SMD	0
PM4546.822NLT PulseLarsen Antenna	FIXED IND 820NH 4.5A 44 MOHM SMD	0
PA4340.331ANLT PulseLarsen Antenna	FIXED IND 330NH 16A 5.4 MOHM SMD	0
PA4305.822NLT PulseLarsen Antenna	FIXED IND 8.2UH 2.22A 140 MOHM	0
PM2205.122NLT PulseLarsen Antenna	FIXED IND 1.2UH 18A 5.83MOHM SMD	1966
PM2201.221NLT PulseLarsen Antenna	FIXED IND 220NH 16.8A 4.6 MOHM	0
PA4333.332NLT PulseLarsen Antenna	FIXED IND 3.3UH 4.6A 30.5 MOHM	0
PF0560.152NL PulseLarsen Antenna	FIXED IND 1.5UH 6.5A 8.1 MOHM	0
P1166.333NLT PulseLarsen Antenna	FIXED IND 33UH 940MA 205 MOHM	777
PA4334.221NLT PulseLarsen Antenna	FIXED IND 220NH 3A 22 MOHM SMD	0
PE-0402CL5N6STT PulseLarsen Antenna	FIXED IND 5.6NH 300MA 300 MOHM	19825
PE-54038SNLT PulseLarsen Antenna	FIXED IND 77UH 2.7A 90 MOHM SMD	413
PG0936.452NL PulseLarsen Antenna	FIXED IND 4.5UH 22A 2.9 MOHM SMD	0
PM5433.722NLT PulseLarsen Antenna	IND COMP AECQ 1580 7.2UH 21A	0
PA2982.151HL PulseLarsen Antenna	FIXED IND 150NH 62A 0.35 MOHM	5150
PM4340.472NLT PulseLarsen Antenna	FIXED IND 4.7UH 4.6A 53MOHM SMD	870

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