Fixed Inductors

Part Number	Description / PDF	Quantity
L-14WR15GV4E Johanson Technology	FIXED IND 150NH 280MA 920 MOHM	0
L-07C39NJV6T Johanson Technology	FIXED IND 39NH 150MA 1.2 OHM SMD	32184
L-05B33NKV6T Johanson Technology	FIXED IND 33NH 200MA 2.3 OHM SMD	0
L-07W30NKV4T Johanson Technology	FIXED IND 30NH 400MA 300 MOHM	0
L-15WR15KV4E Johanson Technology	FIXED IND 150NH 400MA 560 MOHM	0
L-15F1R5JV4E Johanson Technology	FIXED IND 1.5UH 130MA 2.9 OHM	0
L-14W22NJV4E Johanson Technology	FIXED IND 22NH 700MA 220 MOHM	0
L-07C22NJV6T Johanson Technology	FIXED IND 22NH 200MA 800 MOHM	7054
L-14W47NJV4E Johanson Technology	FIXED IND 47NH 600MA 280 MOHM	0
L-14WR27JV4E Johanson Technology	FIXED IND 270NH 170MA 1.8 OHM	0
L-07WR11JV4T Johanson Technology	FIXED IND 110NH 100MA 2.6 OHM	0
L-15F1R5KV4E Johanson Technology	FIXED IND 1.5UH 130MA 2.9 OHM	0
L-07W10NJV4T Johanson Technology	FIXED IND 10NH 480MA 195 MOHM	0
L-14CR15JV4T Johanson Technology	FIXED IND 150NH 300MA 2.4 OHM	0
L-07C1N8SV6T Johanson Technology	FIXED IND 1.8NH 300MA 140 MOHM	61168
L-07C13NKV6T Johanson Technology	FIXED IND 13NH 250MA 550 MOHM	0
L-14WR39KV4E Johanson Technology	FIXED IND 390NH 100MA 5.3 OHM	0
L-07C1N6SV6T Johanson Technology	FIXED IND 1.6NH 300MA 140 MOHM	0
L-14W15NJV4E Johanson Technology	FIXED IND 15NH 700MA 170 MOHM	0
L-15WR39KV4E Johanson Technology	FIXED IND 390NH 210MA 2.2 OHM	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