Fixed Inductors

Part Number	Description / PDF	Quantity
MLF2012A3R9M TDK Corporation	FIXED IND 3.9UH 30MA 650 MOHM	104
NLCV25T-150K-EF TDK Corporation	FIXED IND 15UH 175MA 2.86 OHM	1816
VLS6045EX-151M TDK Corporation	FIXED IND 150UH 700MA 988 MOHM	29014
VLS2010ET-1R5N TDK Corporation	FIXED IND 1.5UH 1.2A 156 MOHM	2000
MHQ1005P13NHT000 TDK Corporation	FIXED IND 13NH 420MA 260 MOHM	0
MLG0603PPA3N9CT000 TDK Corporation	FIXED IND 3.9NH 1A 100 MOHM SMD	22322
MLG0603SR15JTD25 TDK Corporation	FIXED IND 150NH 50MA 8 OHM SMD	0
SPM6530T-2R2M-HZ TDK Corporation	FIXED IND 2.2UH 8.4A 19.03 MOHM	1112
MLF2012A1R2KT000 TDK Corporation	FIXED IND 1.2UH 80MA 350 MOHM	7136
MHQ1005P2N6BT000 TDK Corporation	FIXED IND 2.6NH 900MA 70 MOHM	0
MHQ1005P3N9ST TDK Corporation	FIXED IND 3.9NH 900MA 90 MOHM	0
MLG0603S13NHTD25 TDK Corporation	FIXED IND 13NH 180MA 900 MOHM	0
LGJ12575TS-680M2R0-H TDK Corporation	FIXED IND 68UH 2.4A 77.8 MOHM	480
MLG0603S0N5BTD25 TDK Corporation	FIXED IND 0.5NH 600MA 100 MOHM	0
SPM5020T-1R0M-CA TDK Corporation	FIXED IND 1UH 6A 25.3 MOHM SMD	0
MLG0402P2N2BT000 TDK Corporation	FIXED IND 2.2NH 200MA 700 MOHM	0
MLG0603S1N3CTD25 TDK Corporation	FIXED IND 1.3NH 550MA 150 MOHM	0
NLCV32T-470K-PF TDK Corporation	FIXED IND 47UH 180MA 2.132 OHM	1105
LGJ10145TS-331MR54-H TDK Corporation	FIXED IND 330UH 580MA 680 MOHM	143
NLV32T-010J-EFD TDK Corporation	FIXED IND 10NH 450MA 130 MOHM	625

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