Fixed Inductors

Part Number	Description / PDF	Quantity
PM4546.223NLT PulseLarsen Antenna	FIXED IND 22UH 800MA 1.05 OHM	7983
P1166.681NLT PulseLarsen Antenna	FIXED IND 680NH 5.5A 6 MOHM SMD	0
PM2202.821NLT PulseLarsen Antenna	FIXED IND 820NH 12A 12.7MOHM SMD	0
PA4340.821ANLT PulseLarsen Antenna	FIXED IND 820NH 10A 9.2 MOHM SMD	0
PM4341.471NLT PulseLarsen Antenna	FIXED IND 470NH 17.5A 4.2 MOHM	1000
PA2202.321NLT PulseLarsen Antenna	FIXED IND 325NH 31A 0.48 MOHM	0
PF0581.334NLT PulseLarsen Antenna	FIXED IND 330UH 420MA 1.1 OHM	0
P1168.124NLT PulseLarsen Antenna	FIXED IND 120UH 1.1A 316 MOHM	0
PA3784.181HL PulseLarsen Antenna	FIXED IND 180NH 55A 0.18 MOHM	0
PE-0402CD120JTT PulseLarsen Antenna	FIXED IND 12NH 640MA 120 MOHM	0
PA5004.561NLT PulseLarsen Antenna	FIXED IND 560NH 22A 3.31 MOHM	0
PE-0402CD220GTT PulseLarsen Antenna	FIXED IND 22NH 400MA 300 MOHM	0
P1252.472NLT PulseLarsen Antenna	FIXED IND 4.7UH 8.4A 14 MOHM SMD	0
PE-0603CD7N5JTT PulseLarsen Antenna	FIXED IND 7.5NH 700MA 150 MOHM	0
PE-0402CL270JTT PulseLarsen Antenna	FIXED IND 27NH 300MA 700 MOHM	19994
PG0871.682NL PulseLarsen Antenna	FIXED IND 6.8UH 5.8A 20 MOHM SMD	0
PF0560.224NLT PulseLarsen Antenna	FIXED IND 220UH 700MA 756 MOHM	0
PE-92105KNL PulseLarsen Antenna	FIXED IND 145UH 3A 87 MOHM TH	20
PA5003.472NLT PulseLarsen Antenna	FIXED IND 4.7UH 5.9A 36.3 MOHM	4511
PM4546.102NLT PulseLarsen Antenna	FIXED IND 1UH 4A 47MOHM SMD	5470

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