Fixed Inductors

Part Number	Description / PDF	Quantity
L-07C1N9SV6T Johanson Technology	FIXED IND 1.9NH 300MA 150 MOHM	0
L-05B13NJV6T Johanson Technology	FIXED IND 13NH 250MA 1.35 OHM	281
L-14CR12JV4T Johanson Technology	FIXED IND 120NH 300MA 2.3 OHM	3873
L-07W5N1JV4T Johanson Technology	FIXED IND 5.1NH 800MA 83 MOHM	0
L-15FR47KV4E Johanson Technology	FIXED IND 470NH 500MA 950 MOHM	0
L-05B2N2SV6T Johanson Technology	FIXED IND 2.2NH 300MA 260 MOHM	63470
L-14W33NKV4E Johanson Technology	FIXED IND 33NH 600MA 220 MOHM	0
L-07W2N4SV4T Johanson Technology	FIXED IND 2.4NH 790MA 68 MOHM	0
L-15W6N8KV4E Johanson Technology	FIXED IND 6.8NH 600MA 60 MOHM	0
L-07WR11KV4T Johanson Technology	FIXED IND 110NH 100MA 2.6 OHM	0
L-15F2R2JV4E Johanson Technology	FIXED IND 2.2UH 110MA 3.1 OHM	0
L-15W5N6KV4E Johanson Technology	FIXED IND 5.6NH 600MA 80 MOHM	0
L-07W20NJV4T Johanson Technology	FIXED IND 20NH 420MA 250 MOHM	0
L-14CR22JV4T Johanson Technology	FIXED IND 220NH 300MA 2.8 OHM	0
L-15W39NGV4E Johanson Technology	FIXED IND 39NH 500MA 180 MOHM	0
L-14W72NKV4E Johanson Technology	FIXED IND 72NH 400MA 490 MOHM	0
L-07C10NJV6T Johanson Technology	FIXED IND 10NH 250MA 450 MOHM	90004
L-15W12NJV4E Johanson Technology	FIXED IND 12NH 600MA 80 MOHM SMD	0
L-14C3N9SV4T Johanson Technology	FIXED IND 3.9NH 300MA 250 MOHM	227391
L-07C3N3SV6T Johanson Technology	FIXED IND 3.3NH 300MA 190 MOHM	351043

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