Fixed Inductors

Part Number	Description / PDF	Quantity
MHQ1005P22NGTD25 TDK Corporation	FIXED IND 22NH 230MA 1.1 OHM SMD	20000
MLG0603S0N6BTD25 TDK Corporation	FIXED IND 0.6NH 600MA 100 MOHM	0
MHQ1005P7N3GT000 TDK Corporation	FIXED IND 7.3NH 600MA 170 MOHM	0
MLG0402Q6N8JT000 TDK Corporation	FIXED IND 6.8NH 140MA 1.6 OHM	15395
CLF10040T-150M-H TDK Corporation	FIXED IND 15UH 3.2A 40 MOHM SMD	2198
MLG0603SR18HTD25 TDK Corporation	FIXED IND 180NH 50MA 8.5 OHM SMD	0
CLF12555T-1R0N-H TDK Corporation	FIXED IND 1UH 7.3A 6.4 MOHM SMD	360
CLF7045T-101M TDK Corporation	FIXED IND 100UH 750MA 396 MOHM	0
NLFV32T-220K-EFT TDK Corporation	FIXED IND 22UH 120MA 480 MOHM	0
MLG0603P2N4ST000 TDK Corporation	FIXED IND 2.4NH 500MA 200 MOHM	19890
SPM10040T-R68M-HZ TDK Corporation	FIXED IND 680NH 30A 2.67MOHM SMD	791
SPM4015T-3R3M-LR TDK Corporation	FIXED IND 3.3UH 2.5A 116.6 MOHM	824
MLG0603P22NJT000 TDK Corporation	FIXED IND 22NH 150MA 1.9 OHM SMD	8656
NLV32T-R33J-PF TDK Corporation	FIXED IND 330NH 450MA 400 MOHM	5824
CLF7045T-470M-D TDK Corporation	FIXED IND 47UH 1.2A 180 MOHM SMD	5816
SPM6530T-R47M-HZ TDK Corporation	FIXED IND 470NH 20.5A 3.63 MOHM	1550
VLS201612HBX-R24M-1 TDK Corporation	FIXED IND 240NH 5.65A 29 MOHM	7604
MLG1005S0N4CTD25 TDK Corporation	FIXED IND 0.4NH 1A 100 MOHM SMD	0
MLF2012E5R6KTD25 TDK Corporation	FIXED IND 5.6UH 15MA 600 MOHM	0
MHQ1005P1N3BTD25 TDK Corporation	FIXED IND 1.3NH 1.2A 30 MOHM 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