Fixed Inductors

Part Number	Description / PDF	Quantity
MLF2012A1R0JT000 TDK Corporation	FIXED IND 1UH 80MA 300 MOHM SMD	3018
MHQ1005P3N1ST000 TDK Corporation	FIXED IND 3.1NH 900MA 90 MOHM	0
MLF1005GR82KT TDK Corporation	FIXED IND 820NH 40MA 590 MOHM	0
VLF5010ST-100MR94 TDK Corporation	FIXED IND 10UH 940MA 370 MOHM	11
MLG0603S1N3CT000 TDK Corporation	FIXED IND 1.3NH 550MA 150 MOHM	0
NLCV25T-150K-PFD TDK Corporation	FIXED IND 15UH 175MA 2.86 OHM	0
MLF1608E8R2KTA00 TDK Corporation	FIXED IND 8.2UH 10MA 1.5 OHM SMD	18555
CLF12555T-1R0N TDK Corporation	FIXED IND 1UH 7.5A 5.8 MOHM SMD	8
MLG0603P56NJTD25 TDK Corporation	FIXED IND 56NH 100MA 3.5 OHM SMD	14860
VLS2010ET-1R5N-CA TDK Corporation	FIXED IND 1.5UH 1.25A 156 MOHM	1993
CLF12577NIT-1R0N-D TDK Corporation	FIXED IND 1UH 11.5A 6.24 MOHM	847
NLV32T-1R0J-EFD TDK Corporation	FIXED IND 1UH 400MA 700 MOHM SMD	0
SLF12555T-101M1R1-PF TDK Corporation	FIXED IND 100UH 1.8A 140.4 MOHM	828
MLG0402P1N6BT000 TDK Corporation	FIXED IND 1.6NH 220MA 600 MOHM	0
MLF1005G1R5JTD25 TDK Corporation	FIXED IND 1.5UH 35MA 950MOHM SMD	16805
MLG0603S1N6CT000 TDK Corporation	FIXED IND 1.6NH 500MA 200 MOHM	0
MLG0603S16NHTD25 TDK Corporation	FIXED IND 16NH 180MA 1.1 OHM SMD	0
NLCV25T-1R5M-EFD TDK Corporation	FIXED IND 1.5UH 435MA 546 MOHM	1790
NLV32T-150J-PFD TDK Corporation	FIXED IND 15UH 130MA 2.8 OHM SMD	0
MHQ0603P27NHTD25 TDK Corporation	FIXED IND 27NH 160MA 2.2OHM SMD	2066

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