Fixed Inductors

Part Number	Description / PDF	Quantity
VLS3010ET-100M TDK Corporation	FIXED IND 10UH 560MA 468 MOHM	1959
MLF2012K470MT TDK Corporation	FIXED IND 47UH 4MA 2.7 OHM SMD	0
MHQ1005P43NHTD25 TDK Corporation	FIXED IND 43NH 190MA 1.6 OHM SMD	0
MHQ1005P91NGTD25 TDK Corporation	FIXED IND 91NH 160MA 2.3 OHM SMD	0
MLF1608DR27M TDK Corporation	FIXED IND 270NH 150MA 600 MOHM	4000
RLF10160T-330M1R8-D TDK Corporation	FIXED IND 33UH 1.8A 79.2 MOHM	526
VLF403215MT-150M TDK Corporation	FIXED IND 15UH 1.19A 260 MOHM	3
MHQ1005P11NJTD25 TDK Corporation	FIXED IND 11NH 450MA 240 MOHM	0
MHQ1005P51NHT000 TDK Corporation	FIXED IND 51NH 190MA 1.8 OHM SMD	0
NLCV32T-R10M-EFRD TDK Corporation	FIXED IND 100NH 2.85A 24 MOHM	19867
MLF2012DR33MTD25 TDK Corporation	FIXED IND 330NH 250MA 400 MOHM	0
MHQ0603P5N6HTD25 TDK Corporation	FIXED IND 5.6NH 350MA 400 MOHM	4050
MLG0603P3N2STD25 TDK Corporation	FIXED IND 3.2NH 450MA 200 MOHM	0
MLG1005S1N1STD25 TDK Corporation	FIXED IND 1.1NH 1A 100 MOHM SMD	0
MLZ2012M150WTD25 TDK Corporation	FIXED IND 15UH 250MA 950 MOHM	6195
SLF10145T-3R3N3R7-H TDK Corporation	FIXED IND 3.3UH 3.7A 19.32 MOHM	759
MLG0603P1N6CTD25 TDK Corporation	FIXED IND 1.6NH 700MA 100 MOHM	0
NLCV25T-6R8M-PFR TDK Corporation	FIXED IND 6.8UH 390MA 1.104 OHM	4009
SPM4012T-4R7M-LR TDK Corporation	FIXED IND 4.7UH 1.7A 196.7 MOHM	434
MLG1005S4N7ST000 TDK Corporation	FIXED IND 4.7NH 700MA 250 MOHM	3784

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