Fixed Inductors

Part Number	Description / PDF	Quantity
TFM201610GHM-2R2MTAA TDK Corporation	FIXED IND 2.2UH 1.9A 152 MOHM	1856
VLS3015CX-6R8M-H TDK Corporation	FIXED IND 6.8UH 1.5A 185 MOHM	3180
MLF1005LR47KT000 TDK Corporation	FIXED IND 470NH 50MA 420 MOHM	18504
SLF12565T-330M2R8-H TDK Corporation	FIXED IND 33UH 2.8A 48.72 MOHM	9510
RLF7045T-470M1R0-D TDK Corporation	FIXED IND 47UH 1A 192 MOHM SMD	1225
MLJ1608WR56KT000 TDK Corporation	FIXED IND 560NH 400MA 520 MOHM	2048
MLG0603S11NHT000 TDK Corporation	FIXED IND 11NH 200MA 800 MOHM	0
MHQ1005P47NHTD25 TDK Corporation	FIXED IND 47NH 190MA 1.6 OHM SMD	0
SPM3015T-1R5M-CA TDK Corporation	FIXED IND 1.5UH 3A 73.1 MOHM SMD	0
VLCF4020T-6R8N1R0 TDK Corporation	FIXED IND 6.8UH 1.05A 131 MOHM	1246
MLF2012A1R5MT TDK Corporation	FIXED IND 1.5UH 80MA 400 MOHM	0
MHQ0603P0N8BTD25 TDK Corporation	FIXED IND 0.8NH 1A 70MOHM SMD	16862
CLF7045NIT-101M-D TDK Corporation	FIXED IND 100UH 810MA 310 MOHM	950
SPM4020T-1R5M TDK Corporation	FIXED IND 1.5UH 4.1A 46.8 MOHM	796
SPM5015T-2R2M TDK Corporation	FIXED IND 2.2UH 4.3A 49.5 MOHM	1082
NLC453232T-680K-PF TDK Corporation	FIXED IND 68UH 220MA 2.6 OHM SMD	223
MLZ1608N220LT000 TDK Corporation	FIXED IND 22UH 300MA 1.65 OHM	35430
MLG0603P16NHTD25 TDK Corporation	FIXED IND 16NH 200MA 1.2 OHM SMD	0
MLG0402Q1N2CT000 TDK Corporation	FIXED IND 1.2NH 250MA 500 MOHM	0
MLF1005G1R0JT TDK Corporation	FIXED IND 1UH 40MA 640 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