Fixed Inductors

Part Number	Description / PDF	Quantity
MLF1608E6R8JT000 TDK Corporation	FIXED IND 6.8UH 15MA 1.3 OHM SMD	2807
CLF5030NIT-331M-D TDK Corporation	FIXED IND 330UH 200MA 4.08 OHM	3940
MLF1608DR10MTA00 TDK Corporation	FIXED IND 100NH 200MA 350 MOHM	0
MHQ0603P4N3HTD25 TDK Corporation	FIXED IND 4.3NH 400MA 350 MOHM	4032
VLS201612ET-1R5N-CA TDK Corporation	FIXED IND 1.5UH 1.25A 159 MOHM	0
CLF7045NIT-680M-D TDK Corporation	FIXED IND 68UH 1.08A 200 MOHM	1725
NLV32T-120J-PF TDK Corporation	FIXED IND 12UH 140MA 2.5 OHM SMD	0
VLS252015T-2R2M1R2 TDK Corporation	FIXED IND 2.2UH 1.2A 160 MOHM	1348
NLV32T-100J-PFD TDK Corporation	FIXED IND 10UH 150MA 2.1 OHM SMD	0
SLF10165T-6R8N4R33PF TDK Corporation	FIXED IND 6.8UH 4.3A 18.2 MOHM	125
MLF2012DR33KT000 TDK Corporation	FIXED IND 330NH 250MA 400 MOHM	8584
NLV32T-082J-PFD TDK Corporation	FIXED IND 82NH 450MA 400 MOHM	0
NLCV25T-6R8M-EFR TDK Corporation	FIXED IND 6.8UH 390MA 1.104 OHM	0
MHQ1005P3N4BTD25 TDK Corporation	FIXED IND 3.4NH 900MA 90 MOHM	0
VLS252008ET-R47N TDK Corporation	FIXED IND 470NH 1.2A 140 MOHM	3890
SPM5020T-1R5M TDK Corporation	FIXED IND 1.5UH 5A 33.4 MOHM SMD	697
MLG1005SR13HT000 TDK Corporation	FIXED IND 130NH 150MA 2.5 OHM	0
SLF12555T-680M1R3-PF TDK Corporation	FIXED IND 68UH 2.2A 83.2 MOHM	263
MLG1005S6N2HT000 TDK Corporation	FIXED IND 6.2NH 600MA 250 MOHM	0
MLF1005VR39KT TDK Corporation	FIXED IND 390NH 130MA 1.35 OHM	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