Fixed Inductors

Part Number	Description / PDF	Quantity
CLF6045T-101M-H TDK Corporation	FIXED IND 100UH 700MA 340 MOHM	22
MLK1005S22NJTD25 TDK Corporation	FIXED IND 22NH 200MA 700 MOHM	0
MHQ1005P3N7CTD25 TDK Corporation	FIXED IND 3.7NH 900MA 100 MOHM	0
NLCV32T-R47M-EFRD TDK Corporation	FIXED IND 470NH 2A 45.6 MOHM SMD	0
NLFV32T-470K-EFT TDK Corporation	FIXED IND 47UH 90MA 1.02 OHM SMD	0
MHQ1005P4N7CT000 TDK Corporation	FIXED IND 4.7NH 800MA 110 MOHM	6124
SPM5030T-3R3M-HZ TDK Corporation	FIXED IND 3.3UH 6.5A 29.48 MOHM	371
MHQ1005P2N4BTD25 TDK Corporation	FIXED IND 2.4NH 1A 60 MOHM SMD	0
MHQ1005P4N7ST TDK Corporation	FIXED IND 4.7NH 800MA 110 MOHM	0
CPL2508T1R5M TDK Corporation	FIXED IND 1.5UH 800MA 182 MOHM	1535
VLS201610HBX-1R0M TDK Corporation	FIXED IND 1UH 2.13A 72 MOHM SMD	0
CLF10040T-331M-H TDK Corporation	FIXED IND 330UH 700MA 860 MOHM	1729
MHQ1005P3N0BTD25 TDK Corporation	FIXED IND 3NH 900MA 80 MOHM SMD	0
VLS5045EX-1R0N TDK Corporation	FIXED IND 1UH 5.1A 19.5 MOHM SMD	2653
MLF2012D68NMT000 TDK Corporation	FIXED IND 68NH 300MA 150 MOHM	4204
VLS6045EX-R47N TDK Corporation	FIXED IND 470NH 7A 13 MOHM SMD	3043
MLZ2012E100MT000 TDK Corporation	FIXED IND 10UH 60MA 400 MOHM SMD	61
MLG1005S1N6CTD25 TDK Corporation	FIXED IND 1.6NH 1A 120 MOHM SMD	9945
MLP2016S1R0MT0S1 TDK Corporation	FIXED IND 1UH 1.4A 117 MOHM SMD	2988
MHQ1005P40NHT000 TDK Corporation	FIXED IND 40NH 190MA 1.5 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