Fixed Inductors

Part Number	Description / PDF	Quantity
PE-0402CD1N0JTT PulseLarsen Antenna	FIXED IND 1NH 1.36A 45 MOHM SMD	0
PE-51506NL PulseLarsen Antenna	FIXED IND 17UH 17A 6.5 MOHM TH	0
PA3790.181HL PulseLarsen Antenna	FIXED IND 180NH 57A 0.29 MOHM	0
PM2203.601NLT PulseLarsen Antenna	FIXED IND 600NH 17.7A 4.52 MOHM	0
PM4547.221NLT PulseLarsen Antenna	FIXED IND 220NH 7A 17 MOHM SMD	0
PM4343.152NLT PulseLarsen Antenna	FIXED IND 1.5UH 27A 3 MOHM SMD	0
PA4390.331AHLT PulseLarsen Antenna	FIXED IND 330NH 42A 0.4 MOHM SMD	0
PM4547.332NLT PulseLarsen Antenna	FIXED IND 3.3UH 2.5A 205 MOHM	3000
P1166.682NLT PulseLarsen Antenna	FIXED IND 6.8UH 2.1A 40 MOHM SMD	0
PA4305.105NLT PulseLarsen Antenna	FIXED IND 1MH 200MA 14.823 OHM	0
PG1083.103NL PulseLarsen Antenna	FIXED IND 10.5UH 17.5A 6 MOHM	1516
PA4987.102HLT PulseLarsen Antenna	FIXED IND 1UH 16.2A 0.81 MOHM	299
PA4334.102NLT PulseLarsen Antenna	FIXED IND 1UH 1.87A 52 MOHM SMD	0
PA4340.152NLT PulseLarsen Antenna	FIXED IND 1.5UH 6A 25 MOHM SMD	0
PA5007.562NLT PulseLarsen Antenna	FIXED IND 5.6UH 7.3A 33.2 MOHM	0
PE-53829SNL PulseLarsen Antenna	FIXED IND 112UH 1.26A 300 MOHM	1620
PE-54043NL PulseLarsen Antenna	FIXED IND 121UH 3A 90 MOHM TH	697
P0770.104NLT PulseLarsen Antenna	FIXED IND 100UH 300MA 1.27 OHM	5725
PA4300.683NLT PulseLarsen Antenna	FIXED IND 68UH 505MA 364 MOHM	0
PM4345.682NLT PulseLarsen Antenna	FIXED IND 6.8UH 2.4A 150MOHM SMD	2997

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