Fixed Inductors

Part Number	Description / PDF	Quantity
LQP18MN15NG02D TOKO / Murata	FIXED IND 15NH 150MA 1.3 OHM SMD	577
MBH6045C-471MB=P3 TOKO / Murata	FIXED IND 470UH 410MA 1.704 OHM	0
#B952AS-H-820M=P3 TOKO / Murata	FIXED IND 82UH 1A 295 MOHM SMD	192
LQW15AN2N5B80D TOKO / Murata	FIXED IND 2.5NH 2.1A 30 MOHM SMD	0
LQW04AN47NJ10D TOKO / Murata	FIXED IND 47NH 180MA 1.2 OHM SMD	0
LQP03TQ4N0B02D TOKO / Murata	FIXED IND 4NH 360MA 350 MOHM	12804
LQW15AN9N9J80D TOKO / Murata	FIXED IND 9.9NH 1.4A 81 MOHM SMD	4981
DFE2MCAH1R5MJ0L TOKO / Murata	FIXED IND 1.5UH 1.8A 109 MOHM	3882
LQP03TN2N8B02D TOKO / Murata	FIXED IND 2.8NH 500MA 200 MOHM	0
LQP03TG0N2B02D TOKO / Murata	FIXED IND 0.2NH 850MA 80 MOHM	0
LQH3NPZ6R8MGRL TOKO / Murata	FIXED IND 6.8UH 680MA 276 MOHM	809
LQW03AW2N9C00D TOKO / Murata	FIXED IND 2.9NH 540MA 100 MOHM	4315
LQW18AN12NG0ZD TOKO / Murata	FIXED IND 12NH 600MA 130MOHM SMD	0
LQP03HQ20NH02D TOKO / Murata	FIXED IND 20NH 250MA 800 MOHM	12654
LQW15AN16NJ0ZD TOKO / Murata	FIXED IND 16NH 370MA 240MOHM SMD	0
LQP03PN2N7C02D TOKO / Murata	FIXED IND 2.7NH 1.3A 65 MOHM SMD	3841
LQP03TG4N3H02D TOKO / Murata	FIXED IND 4.3NH 300MA 580 MOHM	11127
LQP02HQ0N2B02E TOKO / Murata	FIXED IND 0.2NH 1A 10 MOHM SMD	14365
LQW18AN19NJ8ZD TOKO / Murata	FIXED IND 19NH 1.4A 75 MOHM SMD	4933
LQW18AN94NJ80D TOKO / Murata	FIXED IND 94NH 490MA 630 MOHM	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