Fixed Inductors

Part Number	Description / PDF	Quantity
MLG0603S36NJT000 TDK Corporation	FIXED IND 36NH 50MA 2 OHM SMD	3559
MHQ1005P72NHT000 TDK Corporation	FIXED IND 72NH 160MA 2.2 OHM SMD	0
SLF12575T-150M4R7-H TDK Corporation	FIXED IND 15UH 4.7A 22.08 MOHM	476
MLG1005S43NHT000 TDK Corporation	FIXED IND 43NH 250MA 1.1 OHM SMD	0
MLG0603P24NJT000 TDK Corporation	FIXED IND 24NH 140MA 2.1 OHM SMD	9642
CLF6045T-680M-D TDK Corporation	FIXED IND 68UH 1A 258 MOHM SMD	48
MHQ0402PSA3N0CT000 TDK Corporation	FIXED IND 3NH 250MA 600 MOHM	0
MLG0402Q3N9CT000 TDK Corporation	FIXED IND 3.9NH 180MA 1.2 OHM	0
MLF2012A1R5MTD25 TDK Corporation	FIXED IND 1.5UH 80MA 400 MOHM	0
MLF2012K470M TDK Corporation	FIXED IND 47UH 4MA 2.7 OHM SMD	3657
VLS252010HBX-R33M TDK Corporation	FIXED IND 330NH 3.74A 31 MOHM	0
VLCF4028T-150MR88-2 TDK Corporation	FIXED IND 15UH 880MA 170 MOHM	353
MHQ1005P24NHT000 TDK Corporation	FIXED IND 24NH 230MA 1.2 OHM SMD	0
LGJ7045TC-220M-D TDK Corporation	FIXED IND 22UH 1.8A 69 MOHM SMD	153
LTF5022T-3R3N2R5-D TDK Corporation	FIXED IND 3.3UH 2.68A 50 MOHM	0
NLV32T-R82J-EF TDK Corporation	FIXED IND 820NH 450MA 650 MOHM	16135
MLF1608C270MTD00 TDK Corporation	FIXED IND 27UH 2MA 1.8 OHM SMD	3169
NLC453232T-270K-PF TDK Corporation	FIXED IND 27UH 330MA 1.2 OHM SMD	0
NLV25T-R47J-EFD TDK Corporation	FIXED IND 470NH 350MA 680 MOHM	0
MLG0603S8N2HTD25 TDK Corporation	FIXED IND 8.2NH 200MA 700 MOHM	0

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