Fixed Inductors

Part Number	Description / PDF	Quantity
VLF403212MT-100M TDK Corporation	FIXED IND 10UH 1.07A 280 MOHM	0
MHQ1005P3N7BT000 TDK Corporation	FIXED IND 3.7NH 900MA 100 MOHM	0
NLCV25T-2R2M-EFRD TDK Corporation	FIXED IND 2.2UH 730MA 324 MOHM	0
VLS201610HBX-2R2M TDK Corporation	FIXED IND 2.2UH 1.45A 170 MOHM	0
MHQ1005P6N8HTD25 TDK Corporation	FIXED IND 6.8NH 700MA 140 MOHM	0
MLF2012C180MT000 TDK Corporation	FIXED IND 18UH 5MA 800 MOHM SMD	0
MLG0603P3N6ST000 TDK Corporation	FIXED IND 3.6NH 400MA 200 MOHM	29271
NLCV32T-1R0M-PF TDK Corporation	FIXED IND 1UH 1A 78 MOHM SMD	20485
MLG0603SR15HT000 TDK Corporation	FIXED IND 150NH 50MA 8 OHM SMD	0
MLP2520S4R7MT0S1 TDK Corporation	FIXED IND 4.7UH 1A 169 MOHM SMD	0
MHQ1005P1N0ST TDK Corporation	FIXED IND 1NH 1.2A 30 MOHM SMD	0
MLF1005G1R8JT TDK Corporation	FIXED IND 1.8UH 30MA 1.05 OHM	0
VLS3010ET-1R0N-CA TDK Corporation	FIXED IND 1UH 2.1A 72 MOHM SMD	1680
MLG1005S9N1HT000 TDK Corporation	FIXED IND 9.1NH 500MA 300 MOHM	0
MHQ0603P3N2CT000 TDK Corporation	FIXED IND 3.2NH 550MA 200 MOHM	0
MLF1608D47NMTA00 TDK Corporation	FIXED IND 47NH 200MA 200 MOHM	4980
MLG1005S5N1STD25 TDK Corporation	FIXED IND 5.1NH 600MA 250 MOHM	4394
VLS252012HBX-1R5M-1 TDK Corporation	FIXED IND 1.5UH 2.75A 82 MOHM	4626
VLS5045EX-6R8M-CA TDK Corporation	FIXED IND 6.8UH 2.9A 59.8 MOHM	27506
NLV32T-151J-PFD TDK Corporation	FIXED IND 150UH 65MA 15 OHM SMD	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