Fixed Inductors

Part Number	Description / PDF	Quantity
L-15W56NJV4E Johanson Technology	FIXED IND 56NH 500MA 250 MOHM	0
L-14W15NKV4E Johanson Technology	FIXED IND 15NH 700MA 170 MOHM	0
L-15W27NJV4E Johanson Technology	FIXED IND 27NH 600MA 120 MOHM	0
L-14W1N6CV4E Johanson Technology	FIXED IND 1.6NH 700MA 80 MOHM	0
L-14W4N7CV4E Johanson Technology	FIXED IND 4.7NH 700MA 110 MOHM	0
L-15FR56KV4E Johanson Technology	FIXED IND 560NH 450MA 1.1 OHM	0
L-14W5N6JV4E Johanson Technology	FIXED IND 5.6NH 700MA 110 MOHM	0
L-15F8R2KV4E Johanson Technology	FIXED IND 8.2UH 120MA 3.5 OHM	0
L-14WR47KV4E Johanson Technology	FIXED IND 470NH 100MA 5.6 OHM	0
L-07C12NJV6T Johanson Technology	FIXED IND 12NH 250MA 500 MOHM	74234
L-07C4N7SV6T Johanson Technology	FIXED IND 4.7NH 300MA 240 MOHM	1985
L-07W5N6KV4T Johanson Technology	FIXED IND 5.6NH 760MA 83 MOHM	0
L-07W15NJV4T Johanson Technology	FIXED IND 15NH 560MA 172 MOHM	0
L-07W10NGV4T Johanson Technology	FIXED IND 10NH 480MA 195 MOHM	0
L-07C56NKV6T Johanson Technology	FIXED IND 56NH 150MA 2 OHM SMD	0
L-15W16NKV4E Johanson Technology	FIXED IND 16NH 600MA 80 MOHM SMD	0
L-15WR22JV4E Johanson Technology	FIXED IND 220NH 400MA 1 OHM SMD	0
L-15WR10JV4E Johanson Technology	FIXED IND 100NH 500MA 430 MOHM	0
L-07W23NJV4T Johanson Technology	FIXED IND 23NH 400MA 214 MOHM	0
L-07CR10JV6T Johanson Technology	FIXED IND 100NH 100MA 2.5 OHM	18994

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