Fixed Inductors

Part Number	Description / PDF	Quantity
MLG1608SR12JT000 TDK Corporation	FIXED IND 120NH 300MA 1.2 OHM	2
MHQ0603P18NHTD25 TDK Corporation	FIXED IND 18NH 180MA 1.7OHM SMD	3984
MLG0402Q2N8BT000 TDK Corporation	FIXED IND 2.8NH 200MA 800 MOHM	0
MHQ1005PR13HT000 TDK Corporation	FIXED IND 130NH 110MA 2.9 OHM	0
VLS2010ET-3R3M TDK Corporation	FIXED IND 3.3UH 830MA 348 MOHM	294
NLV32T-820J-PFD TDK Corporation	FIXED IND 82UH 45MA 10 OHM SMD	0
VLS2012ET-R47N-CA TDK Corporation	FIXED IND 470NH 2A 59 MOHM SMD	0
CLF10040T-220M-CA TDK Corporation	FIXED IND 22UH 2.2A 66 MOHM SMD	732
MHQ1005P27NHTD25 TDK Corporation	FIXED IND 27NH 230MA 1.3 OHM SMD	0
MLG0603P2N9BTD25 TDK Corporation	FIXED IND 2.9NH 500MA 200 MOHM	0
NLCV32T-221K-PFD TDK Corporation	FIXED IND 220UH 80MA 10.92 OHM	0
NLV32T-101J-PFD TDK Corporation	FIXED IND 100UH 40MA 10 OHM SMD	0
VLS252012HBX-1R0M TDK Corporation	FIXED IND 1UH 3A 56 MOHM SMD	0
NLC453232T-101K-PF TDK Corporation	FIXED IND 100UH 180MA 4 OHM SMD	4955
MHQ0402PSA5N1HT000 TDK Corporation	FIXED IND 5.1NH 200MA 800 MOHM	0
VLF302512MT-220M-CA TDK Corporation	FIXED IND 22UH 640MA 700 MOHM	1785
MLG0603PR11HT000 TDK Corporation	FIXED IND 110NH 80MA 5 OHM SMD	0
MLG0402P22NHT000 TDK Corporation	FIXED IND 22NH 200MA 3.2 OHM SMD	0
SPM6530T-3R3M-HZ TDK Corporation	FIXED IND 3.3UH 6.9A 29.7 MOHM	1154
NLV25T-560J-EFD TDK Corporation	FIXED IND 56UH 75MA 12.1 OHM SMD	860

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