Fixed Inductors

Part Number	Description / PDF	Quantity
NLCV25T-1R5M-PFRD TDK Corporation	FIXED IND 1.5UH 890MA 216 MOHM	0
MHQ1005P20NHT000 TDK Corporation	FIXED IND 20NH 260MA 1.1 OHM SMD	9457
RLF12560T-100M7R5 TDK Corporation	FIXED IND 10UH 7.8A 14.88 MOHM	20128
MLP2520V3R3MT TDK Corporation	FIXED IND 3.3UH 900MA 260 MOHM	0
MLK0603L4N7ST000 TDK Corporation	FIXED IND 4.7NH 200MA 500 MOHM	69665
MLK1005S8N2JT000 TDK Corporation	FIXED IND 8.2NH 350MA 380 MOHM	18940
SLF12565T-221M1R0-PF TDK Corporation	FIXED IND 220UH 1.2A 328 MOHM	1484
MLK1005S1N6STD25 TDK Corporation	FIXED IND 1.6NH 500MA 170 MOHM	9784
NLC565050T-270K-PF TDK Corporation	FIXED IND 27UH 440MA 520 MOHM	24
MLJ1608WR39KT000 TDK Corporation	FIXED IND 390NH 450MA 364 MOHM	3209
MLF1608D68NMTD25 TDK Corporation	FIXED IND 68NH 200MA 300 MOHM	3335
MLF2012DR15JTD25 TDK Corporation	FIXED IND 150NH 300MA 200 MOHM	2305
MLP2016H1R5MT TDK Corporation	FIXED IND 1.5UH 1.2A 137.5 MOHM	0
MLF1005VR15KT000 TDK Corporation	FIXED IND 150NH 180MA 630 MOHM	3022
SPM6550T-R47M-HZ TDK Corporation	FIXED IND 470NH 26.1A 2.97 MOHM	1992
VLS201610ET-2R2M-CA TDK Corporation	FIXED IND 2.2UH 950MA 276 MOHM	0
SLF7032T-6R8M1R6-2PF TDK Corporation	FIXED IND 6.8UH 1.6A 49.2 MOHM	1244
MLG0603P75NHT000 TDK Corporation	FIXED IND 75NH 80MA 4 OHM SMD	0
MLG0603P2N5CT000 TDK Corporation	FIXED IND 2.5NH 500MA 200 MOHM	0
MLG0603S2N0CTD25 TDK Corporation	FIXED IND 2NH 400MA 250 MOHM SMD	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