Fixed Inductors

Part Number	Description / PDF	Quantity
LQW18AN3N9B8ZD TOKO / Murata	FIXED IND 3.9NH 2.2A 28 MOHM	3070
LQP03TG9N1H02D TOKO / Murata	FIXED IND 9.1NH 200MA 1.4 OHM	0
LQW15AN20NG80D TOKO / Murata	FIXED IND 20NH 800MA 186 MOHM	639
LQW15AN9N1G8ZD TOKO / Murata	FIXED IND 9.1NH 1.4A 80 MOHM	6890
LQW18ANR22G8ZD TOKO / Murata	FIXED IND 220NH 280MA 2.08 OHM	14913
LQW15AN39NG00D TOKO / Murata	FIXED IND 39NH 250MA 700 MOHM	4729
LQW03AW3N7C00D TOKO / Murata	FIXED IND 3.7NH 340MA 230 MOHM	8212
LQP03TN0N8B02D TOKO / Murata	FIXED IND 0.8NH 800MA 80 MOHM	40128
MBH6045C-1R0ND=P3 TOKO / Murata	FIXED IND 1UH 4.4A 18.2 MOHM	0
LQW15AN47NG8ZD TOKO / Murata	FIXED IND 47NH 440MA 648 MOHM	9470
MDH10060C-470MA=P3 TOKO / Murata	FIXED IND 47UH 2A 74MOHM SMD	473
MBH12575C-100MA=P3 TOKO / Murata	FIXED IND 10UH 5.2A 19.2 MOHM	0
MBH6045C-4R7NA=P3 TOKO / Murata	FIXED IND 4.7UH 2.8A 37.7 MOHM	0
LQP02HQ3N8C02L TOKO / Murata	FIXED IND 3.8NH 350MA 350 MOHM	0
1235AS-H-220M=P3 TOKO / Murata	FIXED IND 22UH 1A 306 MOHM SMD	2108
LQP03HQ2N8B02D TOKO / Murata	FIXED IND 2.8NH 600MA 120 MOHM	12971
LQW18AS11NJ0CD TOKO / Murata	FIXED IND 11NH 700MA 86 MOHM SMD	0
LQW04AN1N8D00D TOKO / Murata	FIXED IND 1.8NH 700MA 60 MOHM	0
LQW18AN91NJ80D TOKO / Murata	FIXED IND 91NH 520MA 540 MOHM	0
LQP02HQ2N7B02L TOKO / Murata	FIXED IND 2.7NH 450MA 200 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