Fixed Inductors

Part Number	Description / PDF	Quantity
NLV32T-6R8J-PF TDK Corporation	FIXED IND 6.8UH 180MA 1.8 OHM	28624
VLM10555T-R33M180-3H TDK Corporation	FIXED IND 330NH 18A 1.2 MOHM SMD	0
MLG0603SR16JT000 TDK Corporation	FIXED IND 160NH 50MA 8.3 OHM SMD	11915
NLV32T-R22J-EF TDK Corporation	FIXED IND 220NH 450MA 320 MOHM	2617
NLCV25T-1R5M-PF TDK Corporation	FIXED IND 1.5UH 435MA 546 MOHM	1812
NLV32T-560J-PF TDK Corporation	FIXED IND 56UH 55MA 8 OHM SMD	725
CLF5030NIT-680M-D TDK Corporation	FIXED IND 68UH 590MA 636 MOHM	2441
MLK1005S39NJTD25 TDK Corporation	FIXED IND 39NH 200MA 1 OHM SMD	3773
SPM5030VT-R33M-D TDK Corporation	INDUCTORS FOR POWER CIRCUITS, FO	0
LTF3020T-100M-D TDK Corporation	FIXED IND 10UH 820MA 260 MOHM	2896
MLG0603PR11JTD25 TDK Corporation	FIXED IND 110NH 80MA 5 OHM SMD	0
MLP2012S1R5T TDK Corporation	FIXED IND 1.5UH 700MA 270 MOHM	7306
SLF7028T-100M1R1-PF TDK Corporation	FIXED IND 10UH 1.1A 83 MOHM SMD	0
NLHV25T-R47J-PF TDK Corporation	FIXED IND 470NH 350MA 830 MOHM	1341
VLCF5028T-101MR33-2 TDK Corporation	FIXED IND 100UH 330MA 670 MOHM	6976
RLF7045T-4R7N2R5-D TDK Corporation	FIXED IND 4.7UH 2.5A 36 MOHM SMD	331
MLP2012S3R3MT0S1 TDK Corporation	FIXED IND 3.3UH 900MA 247 MOHM	8602
MHQ0402PSA2N6BT000 TDK Corporation	FIXED IND 2.6NH 300MA 400 MOHM	60
MLF2012DR82JTD25 TDK Corporation	FIXED IND 820NH 150MA 650 MOHM	2969
VLF10045T-1R5N9R0 TDK Corporation	FIXED IND 1.5UH 9A 6.8 MOHM SMD	61

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