Fixed Inductors

Part Number	Description / PDF	Quantity
VLF504012MT-2R2M-CA TDK Corporation	FIXED IND 2.2UH 2.71A 55 MOHM	370
MHQ1005P3N5CTD25 TDK Corporation	FIXED IND 3.5NH 900MA 90 MOHM	0
TFM252012ALMA4R7MTAA TDK Corporation	FIXED IND 4.7UH 1.6A 200 MOHM	19921
TFM201610ALC-R47MTAA TDK Corporation	FIXED IND 470NH 5.2A 25 MOHM SMD	1364
MHQ0603P33NHTD25 TDK Corporation	FIXED IND 33NH 160MA 2.8OHM SMD	1670
NLCV32T-1R5M-PFRD TDK Corporation	FIXED IND 1.5UH 1.4A 114 MOHM	0
NLV25T-680J-PFD TDK Corporation	FIXED IND 68UH 70MA 16.6 OHM SMD	0
MHQ0603P36NHT000 TDK Corporation	FIXED IND 36NH 160MA 2.8 OHM SMD	5130
KLZ2012MHR1R0HTD25 TDK Corporation	FIXED IND 1UH 800MA 130 MOHM SMD	2695
MLF2012DR10KTD25 TDK Corporation	FIXED IND 100NH 300MA 150 MOHM	751
VLCF4024T-470MR44-2 TDK Corporation	FIXED IND 47UH 440MA 644 MOHM	590
MLP2520W1R0MT0S1 TDK Corporation	FIXED IND 1UH 2.3A 62 MOHM SMD	0
MHQ0603P4N1CT000 TDK Corporation	FIXED IND 4.1NH 400MA 350 MOHM	0
VLS2012ET-220M TDK Corporation	FIXED IND 22UH 330MA 1.764 OHM	2739
MLP2012SR47T TDK Corporation	FIXED IND 470NH 1.2A 169 MOHM	445
MHQ0603P1N3CT000 TDK Corporation	FIXED IND 1.3NH 800MA 100 MOHM	9524
MHQ1005P11NGTD25 TDK Corporation	FIXED IND 11NH 450MA 240 MOHM	0
MHQ1005P1N3STD25 TDK Corporation	FIXED IND 1.3NH 1.2A 30 MOHM SMD	0
MLG0603S8N2HT000 TDK Corporation	FIXED IND 8.2NH 200MA 700 MOHM	0
CLF10040T-471M-H TDK Corporation	FIXED IND 470UH 560MA 1.21 OHM	587

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