Fixed Inductors

Part Number	Description / PDF	Quantity
PM4340.152NLT PulseLarsen Antenna	FIXED IND 1.5UH 6A 25 MOHM SMD	1972
PG0087.682NL PulseLarsen Antenna	FIXED IND 6.8UH 1.5A 105 MOHM	0
PA5001.721NLT PulseLarsen Antenna	FIXED IND 720NH 10.5A 11.6 MOHM	0
PA4548.681NLT PulseLarsen Antenna	FIXED IND 680NH 11A 7.2 MOHM SMD	0
PA4308.473NLT PulseLarsen Antenna	FIXED IND 47UH 1.9A 486 MOHM SMD	0
PE-1008CD220GTT PulseLarsen Antenna	FIXED IND 22NH 1A 120 MOHM SMD	2575
PA4302.332NLT PulseLarsen Antenna	FIXED IND 3.3UH 5.6A 22.8 MOHM	0
PF0581.223NLT PulseLarsen Antenna	FIXED IND 22UH 1.7A 84 MOHM SMD	0
PA2729.283NL PulseLarsen Antenna	FIXED IND 28.1UH 7.8A 14 MOHM	0
PA4308.334NLT PulseLarsen Antenna	FIXED IND 330UH 700MA 3.888 OHM	0
PE-0805CD151JTT PulseLarsen Antenna	FIXED IND 149.4NH 400MA 560 MOHM	2679
PE-53662NL PulseLarsen Antenna	FIXED IND 4.9UH 7.8A 12.4 MOHM	0
PB2020.472NL PulseLarsen Antenna	FIXED IND 4.7UH 16.8A 4.5 MOHM	942
PB2020.103NL PulseLarsen Antenna	FIXED IND 10UH 12.6A 7.8 MOHM	339
PA5187.181HLT PulseLarsen Antenna	FIXED IND 180NH 48A 0.12 MOHM	220
PA4346.152ANLT PulseLarsen Antenna	FIXED IND 1.5UH 22A 3.8 MOHM SMD	0
PM4344.102NLT PulseLarsen Antenna	FIXED IND 1UH 52A 2 MOHM SMD	197
PA2729.333NL PulseLarsen Antenna	FIXED IND 32.9UH 6.7A 18.5 MOHM	2143
PE-53680NL PulseLarsen Antenna	FIXED IND 1.32UH 11.5A 4 MOHM	0
PM4341.562NLT PulseLarsen Antenna	FIXED IND 5.6UH 5A 48 MOHM SMD	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