Fixed Inductors

Part Number	Description / PDF	Quantity
MHQ1005PR11JTD25 TDK Corporation	FIXED IND 110NH 150MA 2.7 OHM	0
MLK0603L2N4ST000 TDK Corporation	FIXED IND 2.4NH 300MA 350 MOHM	24498
MLP2520H3R3MT TDK Corporation	FIXED IND 3.3UH 1.1A 169 MOHM	0
MHQ1005P39NJT000 TDK Corporation	FIXED IND 39NH 190MA 1.5 OHM SMD	1453
MHQ0603P2N3BT000 TDK Corporation	FIXED IND 2.3NH 700MA 150 MOHM	19610
MLK1005SR13JTD25 TDK Corporation	FIXED IND 130NH 100MA 3.3 OHM	19433
MLF1608A1R5KTA00 TDK Corporation	FIXED IND 1.5UH 50MA 700 MOHM	15436
MLF1005VR22JTD25 TDK Corporation	FIXED IND 220NH 160MA 790 MOHM	19704
MLG0603P2N0BT000 TDK Corporation	FIXED IND 2NH 600MA 100 MOHM SMD	0
MLG1005S0N6BTD25 TDK Corporation	FIXED IND 0.6NH 1A 100 MOHM SMD	2970
MLP2520K1R0ST0S1 TDK Corporation	FIXED IND 1UH 2.3A 62.4 MOHM SMD	4
MLG0603P33NJTD25 TDK Corporation	FIXED IND 33NH 130MA 2.2 OHM SMD	11575
MHQ1005P3N5ST000 TDK Corporation	FIXED IND 3.5NH 900MA 90 MOHM	0
VLS201610CX-150M TDK Corporation	FIXED IND 15UH 540MA 1.258 OHM	0
MHQ1005P2N3ST000 TDK Corporation	FIXED IND 2.3NH 1A 70 MOHM SMD	0
MLG0603P20NHT000 TDK Corporation	FIXED IND 20NH 150MA 1.9 OHM SMD	0
MLK0603L3N3ST000 TDK Corporation	FIXED IND 3.3NH 200MA 400 MOHM	72702
MLP2520H4R7ST0S1 TDK Corporation	FIXED IND 4.7UH 1A 169 MOHM SMD	2113
MLP2012S1R0T TDK Corporation	FIXED IND 1UH 800MA 299 MOHM SMD	3945
TFM252012ALMAR33MTAA TDK Corporation	FIXED IND 330NH 5.7A 18 MOHM SMD	11490

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