Fixed Inductors

Image	Part Number	Description / PDF	Quantity	Rfq
	L-07CR12JV4T Johanson Technology	FIXED IND 120NH 100MA 2.5 OHM	0
	L-07C19NKV6T Johanson Technology	FIXED IND 19NH 200MA SMD	0
	L-15W19NJV4E Johanson Technology	FIXED IND 19NH 600MA 80 MOHM SMD	0
	L-14C11NJV4T Johanson Technology	FIXED IND 11NH 300MA SMD	0
	L-14C5N1KV4T Johanson Technology	FIXED IND 5.1NH 300MA SMD	0
	L-07C3N3KV4T Johanson Technology	FIXED IND 3.3NH 300MA 190 MOHM	0
	L-14W23NKV4E Johanson Technology	FIXED IND 23NH 220 MOHM SMD	0
	L-07C1N6SV4T Johanson Technology	FIXED IND 1.6NH 300MA 140 MOHM	0
	L-14W16NKV4E Johanson Technology	FIXED IND 16NH 700MA 170 MOHM	0
	L-15W6N2KV4E Johanson Technology	FIXED IND 6.2NH 600MA SMD	0
	L-07C30NJV6T Johanson Technology	FIXED IND 30NH 200MA SMD	0
	L-14C23NJV4T Johanson Technology	FIXED IND 23NH 300MA SMD	0
	L-07C11NKV4T Johanson Technology	FIXED IND 11NH 250MA SMD	0
	L-15W4N3SV4E Johanson Technology	FIXED IND 4.3NH 600MA SMD	0
	L-15W23NGV4E Johanson Technology	FIXED IND 23NH 600MA SMD	0
	L-14C30NKV4T Johanson Technology	FIXED IND 30NH 300MA SMD	0
	L-14C36NKV4T Johanson Technology	FIXED IND 36NH 300MA SMD	0
	L-15W6N2JV4E Johanson Technology	FIXED IND 6.2NH 600MA SMD	0
	L-14C1N9SV4T Johanson Technology	FIXED IND 1.9NH 300MA SMD	0
	L-07C5N1KV4T Johanson Technology	FIXED IND 5.1NH 300MA 260 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