Fixed Inductors

Part Number	Description / PDF	Quantity
MLF1608A2R2KTD25 TDK Corporation	FIXED IND 2.2UH 30MA 1 OHM SMD	3270
SLF6045T-150M1R3-3PF TDK Corporation	FIXED IND 15UH 2.2A 71.4 MOHM	6619
SPM5015T-100M-LR TDK Corporation	FIXED IND 10UH 2.3A 193.8 MOHM	260
MHQ1005P4N3BTD25 TDK Corporation	FIXED IND 4.3NH 800MA 100 MOHM	0
SLF7045T-101MR50-PF TDK Corporation	FIXED IND 100UH 650MA 300 MOHM	24548
MLG0603P5N1STD25 TDK Corporation	FIXED IND 5.1NH 350MA 400 MOHM	0
MLP2520V1R5ST0S1 TDK Corporation	FIXED IND 1.5UH 1.4A 130 MOHM	5827
NLV32T-012J-PF TDK Corporation	FIXED IND 12NH 450MA 140 MOHM	0
MHQ0603P11NHTD25 TDK Corporation	FIXED IND 11NH 240MA 1.3OHM SMD	13810
MHQ1005P27NHT000 TDK Corporation	FIXED IND 27NH 230MA 1.3 OHM SMD	0
VLCF5028T-220MR71-2 TDK Corporation	FIXED IND 22UH 710MA 140 MOHM	2869
SPM5030T-5R6M-HZ TDK Corporation	FIXED IND 5.6UH 4.5A 73.81 MOHM	197
MLG0603P36NHTD25 TDK Corporation	FIXED IND 36NH 120MA 2.4 OHM SMD	0
MLG0603S43NJTD25 TDK Corporation	FIXED IND 43NH 50MA 2.2 OHM SMD	0
MHQ0603P39NHTD25 TDK Corporation	FIXED IND 39NH 160MA 3OHM SMD	3656
NLCV25T-330K-EF TDK Corporation	FIXED IND 33UH 120MA 5.46 OHM	500
CPL2508T150M TDK Corporation	FIXED IND 15UH 230MA 2.6 OHM SMD	1518
LGJ7045TC-2R2N-D TDK Corporation	FIXED IND 2.2UH 4.3A 14.6 MOHM	0
MLG0402Q1N1CT000 TDK Corporation	FIXED IND 1.1NH 250MA 500 MOHM	0
MHQ0603P5N1CT000 TDK Corporation	FIXED IND 5.1NH 350MA 400 MOHM	6078

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