Fixed Inductors

Part Number	Description / PDF	Quantity
NLCV32T-221K-PF TDK Corporation	FIXED IND 220UH 80MA 10.92 OHM	205
VLS3012HBX-R68M TDK Corporation	FIXED IND 680nH 5.66A 38 MOHM	1101
MLF1608DR56MTA00 TDK Corporation	FIXED IND 560NH 100MA 1.05 OHM	0
CLF6045NIT-330M-D TDK Corporation	FIXED IND 33UH 1.1A 120 MOHM SMD	980
MHQ1005P72NJTD25 TDK Corporation	FIXED IND 72NH 160MA 2.2 OHM SMD	0
MLF2012A4R7KT000 TDK Corporation	FIXED IND 4.7UH 30MA 700 MOHM	4772
MLG1608SR33JTD25 TDK Corporation	FIXED IND 330NH 100MA 2.8 OHM	5300
VLS6045EX-4R7M TDK Corporation	FIXED IND 4.7UH 4.2A 35 MOHM SMD	12965
MLG0603P9N1JTD25 TDK Corporation	FIXED IND 9.1NH 250MA 900 MOHM	9791
MLG1005S30NJT000 TDK Corporation	FIXED IND 30NH 300MA 800 MOHM	19405
NLFV32T-470K-EF TDK Corporation	FIXED IND 47UH 90MA 1.02 OHM SMD	1900
HPL758040FR33MRD3P TDK Corporation	FIXED IND 330NH 43A 0.61 MOHM	1035
MLG1005S33NHTD25 TDK Corporation	FIXED IND 33NH 300MA 900 MOHM	0
VLS201612ET-1R0N-CA TDK Corporation	FIXED IND 1UH 1.65A 93 MOHM SMD	240
VLF403210MT-6R8M TDK Corporation	FIXED IND 6.8UH 1.24A 220 MOHM	950
SPM5030VT-2R2M-D TDK Corporation	FIXED IND 2.2UH 6.6A 20 MOHM SMD	3745
MHQ0402PSA1N7ST000 TDK Corporation	FIXED IND 1.7NH 400MA 400 MOHM	0
MLZ2012N4R7LT000 TDK Corporation	FIXED IND 4.7UH 600MA 180 MOHM	16469
MLJ1005WR14JT000 TDK Corporation	FIXED IND 140NH 450MA 450 MOHM	19080
NLCV32T-2R2M-EFR TDK Corporation	FIXED IND 2.2UH 1.2A 138 MOHM	13866

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