Fixed Inductors

Part Number	Description / PDF	Quantity
MLG0402P5N1ST000 TDK Corporation	FIXED IND 5.1NH 160MA 1.4 OHM	0
MLF2012A1R0KT000 TDK Corporation	FIXED IND 1UH 80MA 300 MOHM SMD	27555
MHQ1005P5N6BTD25 TDK Corporation	FIXED IND 5.6NH 800MA 130 MOHM	0
MHQ0603P3N3CT000 TDK Corporation	FIXED IND 3.3NH 500MA 250 MOHM	25357
MHQ0603P2N6BT000 TDK Corporation	FIXED IND 2.6NH 500MA 250 MOHM	13940
CLF10060NIT-220M-D TDK Corporation	FIXED IND 22UH 2.65A 51.6 MOHM	0
SPM7054VT-470M-D TDK Corporation	FIXED IND 47UH 2.5A 162 MOHM SMD	625
VLCF4028T-1R6N2R3-2 TDK Corporation	FIXED IND 1.6UH 2.31A 38 MOHM	1761
CLF10040T-4R7N-D TDK Corporation	FIXED IND 4.7UH 4.2A 18.85 MOHM	531
MLG1005SR11HT000 TDK Corporation	FIXED IND 110NH 150MA 2.2 OHM	0
VLF302510MT-6R8M TDK Corporation	FIXED IND 6.8UH 840MA 258 MOHM	0
MLF2012DR18M TDK Corporation	FIXED IND 180NH 300MA 250 MOHM	5305
MHQ0402PSA6N8HT000 TDK Corporation	FIXED IND 6.8NH 200MA 1 OHM SMD	39438
MHQ1005P3N0CTD25 TDK Corporation	FIXED IND 3NH 900MA 80 MOHM SMD	0
MLG0603P2N8BTD25 TDK Corporation	FIXED IND 2.8NH 500MA 200 MOHM	0
CLF7045NIT-330M-D TDK Corporation	FIXED IND 33UH 1.6A 116.4 MOHM	4381
MHQ0402PSA2N2BT000 TDK Corporation	FIXED IND 2.2NH 400MA 400 MOHM	19221
MLF1005GR82JTD25 TDK Corporation	FIXED IND 820NH 40MA 590MOHM SMD	5718
VLS252010CX-150M-1 TDK Corporation	FIXED IND 15UH 560MA 914 MOHM	1208
MLF1608C220KTD25 TDK Corporation	FIXED IND 22UH 2MA 1.7 OHM SMD	404

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