Fixed Inductors

Part Number	Description / PDF	Quantity
MLG0603P7N5JTD25 TDK Corporation	FIXED IND 7.5NH 300MA 800 MOHM	12790
VLCF5020T-100MR87 TDK Corporation	FIXED IND 10UH 870MA 182 MOHM	12118
MLG0402Q5N6ST000 TDK Corporation	FIXED IND 5.6NH 140MA 1.5 OHM	0
VLS252012ET-2R2M TDK Corporation	FIXED IND 2.2UH 1.3A 154 MOHM	233557
MLG1005S0N9CTD25 TDK Corporation	FIXED IND 0.9NH 1A 100 MOHM SMD	9390
NLV32T-151J-PF TDK Corporation	FIXED IND 150UH 65MA 15 OHM SMD	3591
MLG0402P4N3ST000 TDK Corporation	FIXED IND 4.3NH 180MA 1.2 OHM	0
CLF5030NIT-2R2N-D TDK Corporation	FIXED IND 2.2UH 3.1A 39 MOHM	2511
MHQ1005P43NHT000 TDK Corporation	FIXED IND 43NH 190MA 1.6 OHM SMD	0
MHQ1005P2N7STD25 TDK Corporation	FIXED IND 2.7NH 900MA 70 MOHM	0
VLS201610CX-1R0M-1 TDK Corporation	FIXED IND 1UH 2.14A 66 MOHM SMD	0
MHQ0402PSA1N0BT000 TDK Corporation	FIXED IND 1NH 600MA 150 MOHM	12027
VLBU10060120T-R10L TDK Corporation	FIXED IND 100NH 83A 0.12MOHM SMD	720
MHQ1005P1N4CT000 TDK Corporation	FIXED IND 1.4NH 1A 40 MOHM SMD	0
NL453232T-330J-PF TDK Corporation	FIXED IND 33UH 160MA 4 OHM SMD	158
MLG1005S1N2ST000 TDK Corporation	FIXED IND 1.2NH 1A 100 MOHM SMD	25052
RLF7030T-1R0N6R4-T TDK Corporation	FIXED IND 1UH 6.4A 8.76 MOHM SMD	0
MHQ1005P8N2HTD25 TDK Corporation	FIXED IND 8.2NH 550MA 160 MOHM	0
MLG1005SR12HTD25 TDK Corporation	FIXED IND 120NH 150MA 2.2 OHM	0
MHQ1005P2N0ST TDK Corporation	FIXED IND 2NH 1A 50 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