Fixed Inductors

Part Number	Description / PDF	Quantity
LQP02TN1N4C02D TOKO / Murata	FIXED IND 1.4NH 220MA 600 MOHM	0
LQG15HS1N5C02D TOKO / Murata	FIXED IND 1.5NH 1A 70 MOHM SMD	8679
MBH10145C-680MA=P3 TOKO / Murata	FIXED IND 68UH 1.5A 140 MOHM	0
DFE18SANR47MG0L TOKO / Murata	FIXED IND 470NH 2.6A 54 MOHM SMD	783
LQM21NN1R2K10D TOKO / Murata	FIXED IND 1.2UH 50MA 470 MOHM	3606
LQW15AN11NH00D TOKO / Murata	FIXED IND 11NH 500MA 140 MOHM	0
LQW15AN12NG80D TOKO / Murata	FIXED IND 12NH 1.24A 93 MOHM SMD	19970
LQW15CNR42J10D TOKO / Murata	FIXED IND 420NH 370MA 620 MOHM	0
LQM2HPN1R5MGHL TOKO / Murata	FIXED IND 1.5UH 2A 81 MOHM SMD	0
LQH32PB2R2NN0L TOKO / Murata	FIXED IND 2.2UH 1.6A 91.2 MOHM	0
LQP02HQ4N7H02E TOKO / Murata	FIXED IND 4.7NH 350MA 350 MOHM	0
LQP15MN1N8W02D TOKO / Murata	FIXED IND 1.8NH 280MA 200 MOHM	5261
LQW18AS51NG0ZD TOKO / Murata	FIXED IND 51NH 600MA 270 MOHM	809
LQW04AN16NH00D TOKO / Murata	FIXED IND 16NH 270MA 380 MOHM	0
LQW18AN10NG00D TOKO / Murata	FIXED IND 10NH 650MA 110 MOHM	104
LQG15WH19NJ02D TOKO / Murata	FIXED IND 19NH 260MA 800 MOHM	9880
1277AS-H-R47M=P2 TOKO / Murata	FIXED IND 470NH 3.7A 31 MOHM SMD	1905
LQG15WZR13J02D TOKO / Murata	FIXED IND 130NH 110MA 2.9 OHM	9905
1269AS-H-1R5M=P2 TOKO / Murata	FIXED IND 1.5UH 2.1A 108 MOHM	22363
LQM21DN100N00D TOKO / Murata	FIXED IND 10UH 15MA 500 MOHM SMD	663

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