Fixed Inductors

Part Number	Description / PDF	Quantity
MHQ1005P3N6BT000 TDK Corporation	FIXED IND 3.6NH 900MA 90 MOHM	0
NLV32T-150J-EFD TDK Corporation	FIXED IND 15UH 130MA 2.8 OHM SMD	1145
VLF504015MT-1R5N TDK Corporation	FIXED IND 1.5UH 3.27A 38 MOHM	1682
NLV32T-100J-EFD TDK Corporation	FIXED IND 10UH 150MA 2.1 OHM SMD	60
MLG0603P2N6STD25 TDK Corporation	FIXED IND 2.6NH 500MA 200 MOHM	0
VLM10555T-R70M120-3H TDK Corporation	FIXED IND 700NH 12A 2.5 MOHM SMD	0
SLF7045T-150M1R1-PF TDK Corporation	FIXED IND 15UH 1.53A 62.4 MOHM	2907
NLC453232T-560K-PF TDK Corporation	FIXED IND 56UH 240MA 2.2 OHM SMD	70
MLF1005VR56JTD25 TDK Corporation	FIXED IND 560NH 120MA 1.95 OHM	18631
SPM4015T-1R5M-CA TDK Corporation	FIXED IND 1.5UH 3.7A 56 MOHM SMD	0
NLV32T-1R2J-PF TDK Corporation	FIXED IND 1.2UH 390MA 750 MOHM	4944
MLG0402Q27NJT000 TDK Corporation	FIXED IND 27NH 120MA 3.5 OHM SMD	12011
MHQ1005P1N7ST000 TDK Corporation	FIXED IND 1.7NH 1A 40 MOHM SMD	0
MHQ0402PSA0N6CT000 TDK Corporation	FIXED IND 0.6NH 600MA 150 MOHM	0
MLG1005S68NHTD25 TDK Corporation	FIXED IND 68NH 200MA 1.5 OHM SMD	0
MHQ1005P1N0STD25 TDK Corporation	FIXED IND 1NH 1.2A 30 MOHM SMD	0
MHQ1005P3N5BTD25 TDK Corporation	FIXED IND 3.5NH 900MA 90 MOHM	0
VLS201610CX-R47M TDK Corporation	FIXED IND 470NH 2.69A 50M OHM	0
VLBU6565100T-R10L TDK Corporation	FIXED IND 100NH 70A 0.18 MOHM	165
MHQ1005P6N2CT000 TDK Corporation	FIXED IND 6.2NH 700MA 130 MOHM	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