Fixed Inductors

Part Number	Description / PDF	Quantity
MHQ0603P4N2CT000 TDK Corporation	FIXED IND 4.2NH 400MA 350 MOHM	0
MLG1005SR12HT000 TDK Corporation	FIXED IND 120NH 150MA 2.2 OHM	18785
GLFR1608T330M-LR TDK Corporation	FIXED IND 33UH 120MA 2.2 OHM SMD	0
MLG1005S30NHT000 TDK Corporation	FIXED IND 30NH 300MA 800 MOHM	0
MLP2012V1R0TT TDK Corporation	FIXED IND 1UH 700MA 338 MOHM SMD	0
NLFV32T-1R5M-EF TDK Corporation	FIXED IND 1.5UH 600MA 84 MOHM	3305
LGJ7045TC-101M-H TDK Corporation	FIXED IND 100UH 750MA 330 MOHM	215
MLG1005SR22JTD25 TDK Corporation	FIXED IND 220NH 100MA 4.2 OHM	9235
VLS4012HBX-6R8M TDK Corporation	FIXED IND 6.8UH 2.36A 208 MOHM	1860
LTF4022T-6R8N-D TDK Corporation	FIXED IND 6.8UH 1.5A 140 MOHM	287
MLJ1005WR16JT000 TDK Corporation	FIXED IND 160NH 400MA 520 MOHM	15952
SPM4015T-100M-LR TDK Corporation	FIXED IND 10UH 1.5A 345 MOHM SMD	884
MHQ1005P27NGTD25 TDK Corporation	FIXED IND 27NH 230MA 1.3 OHM SMD	0
MLZ1608M220WT000 TDK Corporation	FIXED IND 22UH 150MA 2.4 OHM SMD	6548
SPM4030T-2R2M TDK Corporation	FIXED IND 2.2UH 4.8A 40.15 MOHM	572
NLCV25T-2R2M-EFR TDK Corporation	FIXED IND 2.2UH 730MA 324 MOHM	1531
NLFV32T-2R2M-EFT TDK Corporation	FIXED IND 2.2UH 500MA 108 MOHM	0
MLG1005S3N6ST000 TDK Corporation	FIXED IND 3.6NH 700MA 200 MOHM	4855
MLP2520V1R0MT0S1 TDK Corporation	FIXED IND 1UH 1.3A 130 MOHM SMD	5605
VLS3012ET-220M-CA TDK Corporation	FIXED IND 22UH 610MA 756 MOHM	12290

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