Fixed Inductors

Part Number	Description / PDF	Quantity
PA4305.274NLT PulseLarsen Antenna	FIXED IND 270UH 390MA 3.568 OHM	0
PA4303.224NLT PulseLarsen Antenna	FIXED IND 220UH 800MA 663 MOHM	0
PG0087.683NL PulseLarsen Antenna	FIXED IND 68UH 430MA 710 MOHM	0
PE-0805CD150GTT PulseLarsen Antenna	FIXED IND 14.9NH 600MA 170 MOHM	0
PA4304.824NLT PulseLarsen Antenna	FIXED IND 820UH 380MA 1.85 OHM	0
PA4341.472NLT PulseLarsen Antenna	FIXED IND 4.7UH 5.5A 40 MOHM SMD	0
PM4548.151NLT PulseLarsen Antenna	FIXED IND 150NH 30A 2.3 MOHM SMD	0
P1169.153NLT PulseLarsen Antenna	FIXED IND 15UH 3.1A 47 MOHM SMD	0
PE-92112KNL PulseLarsen Antenna	FIXED IND 100UH 5A 34 MOHM TH	594
PE-0805CD180GTT PulseLarsen Antenna	FIXED IND 17.95NH 600MA 200 MOHM	0
PA4301.152NLT PulseLarsen Antenna	FIXED IND 1.5UH 3.53A 19.6 MOHM	0
P0752.224NLT PulseLarsen Antenna	FIXED IND 220UH 800MA 840 MOHM	20073
PM4342.331NLT PulseLarsen Antenna	FIXED IND 330NH 31A 1.2 MOHM SMD	0
PA4345.152NLT PulseLarsen Antenna	FIXED IND 1.5UH 5.5A 30.5 MOHM	0
PA4341.152ANLT PulseLarsen Antenna	FIXED IND 1.5UH 10A 12.1 MOHM	2041
PE-0805CD111GTT PulseLarsen Antenna	FIXED IND 110NH 400MA 480 MOHM	0
PA4349.683ANLT PulseLarsen Antenna	FIXED IND 68UH 14A 29.5 MOHM SMD	0
PA4334.362NLT PulseLarsen Antenna	FIXED IND 3.6UH 1.36A 130 MOHM	0
PE-54040SNL PulseLarsen Antenna	FIXED IND 38UH 3A 50 MOHM SMD	1101
P1169.124NLT PulseLarsen Antenna	FIXED IND 120UH 1.1A 316 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