Fixed Inductors

Part Number	Description / PDF	Quantity
L-07W6N8JV4T Johanson Technology	FIXED IND 6.8NH 680MA 83 MOHM	9389
L-14WR10GV4E Johanson Technology	FIXED IND 100NH 400MA 630 MOHM	0
L-07C2N7SV6T Johanson Technology	FIXED IND 2.7NH 300MA 170 MOHM	47033
L-14W72NJV4E Johanson Technology	FIXED IND 72NH 400MA 490 MOHM	0
L-14WR39JV4E Johanson Technology	FIXED IND 390NH 100MA 5.3 OHM	0
L-07W24NJV4T Johanson Technology	FIXED IND 24NH 400MA 300 MOHM	0
L-07W47NJV4T Johanson Technology	FIXED IND 47NH 100MA 830 MOHM	0
L-07W56NKV4T Johanson Technology	FIXED IND 56NH 100MA 970 MOHM	0
L-15WR27KV4E Johanson Technology	FIXED IND 270NH 350MA 1.46 OHM	0
L-07C4N3KV6T Johanson Technology	FIXED IND 4.3NH 300MA 240 MOHM	0
L-07W6N2KV4T Johanson Technology	FIXED IND 6.2NH 760MA 83 MOHM	0
L-14W5N1KV4E Johanson Technology	FIXED IND 5.1NH 700MA 110 MOHM	0
L-07W1N0CV4T Johanson Technology	FIXED IND 1NH 1.3A 45 MOHM SMD	0
L-14WR27KV4E Johanson Technology	FIXED IND 270NH 170MA 1.8 OHM	0
L-15W18NJV4E Johanson Technology	FIXED IND 18NH 600MA 80 MOHM SMD	0
L-07C3N0SV6T Johanson Technology	FIXED IND 3NH 300MA 180 MOHM SMD	22752
L-14C15NKV4T Johanson Technology	FIXED IND 15NH 300MA 550 MOHM	0
L-05B8N2JV6T Johanson Technology	FIXED IND 8.2NH 250MA 900 MOHM	4649
L-15WR10KV4E Johanson Technology	FIXED IND 100NH 500MA 430 MOHM	0
L-07W18NKV4T Johanson Technology	FIXED IND 18NH 420MA 230 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