Fixed Inductors

Part Number	Description / PDF	Quantity
MPL-SE6040-8R2 MPS (Monolithic Power Systems)	FIXED IND 8.2UH 4A 39 MOHM SMD	992
MPL-SE2512-R68 MPS (Monolithic Power Systems)	FIXED IND 680NH 3.8A 33 MOHM SMD	2000
MPL-SE6040-3R3 MPS (Monolithic Power Systems)	FIXED IND 3.3UH 5.6A 19.5 MOHM	988
MPL-AY1265-1R8 MPS (Monolithic Power Systems)	FIXED IND 1.8UH 20A 3.3 MOHM SMD	456
MPL-AL4020-R47 MPS (Monolithic Power Systems)	FIXED IND 470NH 9.2A 6.2 MOHM	2999
MPL-AL6050-1R2 MPS (Monolithic Power Systems)	FIXED IND 1.2UH 14.6A 5.3 MOHM	800
MPL-SE2512-1R0 MPS (Monolithic Power Systems)	FIXED IND 1UH 3.35A 45 MOHM SMD	1958
MPL-SE4030-4R7 MPS (Monolithic Power Systems)	FIXED IND 4.7UH 2.6A 63 MOHM SMD	1710
MPL-AY1265-1R0 MPS (Monolithic Power Systems)	FIXED IND 1UH 25.5A 1.5 MOHM SMD	500
MPL-AL5030-1R2 MPS (Monolithic Power Systems)	FIXED IND 1.2UH 10A 8 MOHM SMD	2000
MPL-SE5040-100 MPS (Monolithic Power Systems)	FIXED IND 10UH 3.2A 56 MOHM SMD	1386
MPL-AL5030-R82 MPS (Monolithic Power Systems)	FIXED IND 820NH 12.8A 5 MOHM SMD	2000
MPL-AL4020-R82 MPS (Monolithic Power Systems)	FIXED IND 820NH 8.4A 9 MOHM SMD	2997
MPL-AY1050-3R3 MPS (Monolithic Power Systems)	FIXED IND 3.3UH 12.5A 8 MOHM SMD	500
MPL-AL4020-1R2 MPS (Monolithic Power Systems)	FIXED IND 1.2UH 7.4A 12.2 MOHM	2943
MPL-AY1050-R68 MPS (Monolithic Power Systems)	FIXED IND 680NH 23A 1.75 MOHM	500
MPL-AL5030-1R8 MPS (Monolithic Power Systems)	FIXED IND 1.8UH 8.8A 10.5 MOHM	1995
MPL-AY3020-5R6 MPS (Monolithic Power Systems)	FIXED IND 5.6UH 1.8A 209 MOHM	2943
MPL-AL4020-1R0 MPS (Monolithic Power Systems)	FIXED IND 1UH 7.9A 10.1 MOHM SMD	2950
MPL-AL6050-3R3 MPS (Monolithic Power Systems)	FIXED IND 3.3UH 10.1A 11.5MOHM	361

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