Fixed Inductors

Image	Part Number	Description / PDF	Quantity	Rfq
	T1008-R12G Tamura	FIXED IND 120NH 650MA 280 MOHM	0
	TO3316-681M Tamura	FIXED IND 680UH 400MA 2.02 OHM	0
	TS1205-1R2M Tamura	FIXED IND 1.2UH 20A 2.8 MOHM SMD	0
	T1812-331J Tamura	FIXED IND 330UH 100MA 14 OHM SMD	0
	TO3316-1R5M Tamura	FIXED IND 1.5UH 6.4A 10 MOHM SMD	0
	T1210-82NG Tamura	FIXED IND 82NH 900MA 100 MOHM	0
	TS1608-472M Tamura	FIXED IND 4.7MH 60MA 13.9 OHM	0
	TS1608-150M Tamura	FIXED IND 15UH 800MA 90 MOHM SMD	0
	T1812-101J Tamura	FIXED IND 100UH 150MA 8 OHM SMD	0
	T1812-471J Tamura	FIXED IND 470UH 85MA 26 OHM SMD	0
	TO1608-330M Tamura	FIXED IND 33UH 600MA 510 MOHM	0
	T1008-R33G Tamura	FIXED IND 330NH 450MA 450 MOHM	0
	T1008-1R8G Tamura	FIXED IND 1.8UH 300MA 2.6 OHM	0
	T1210-R47G Tamura	FIXED IND 470NH 490MA 690 MOHM	0
	T1812-100J Tamura	FIXED IND 10UH 190MA 1.6 OHM SMD	0
	TS5022-331M Tamura	FIXED IND 330UH 900MA 500 MOHM	0
	T1008-22NG Tamura	FIXED IND 22NH 1A 120 MOHM SMD	0
	T1210-R12G Tamura	FIXED IND 120NH 800MA 120 MOHM	0
	TO5022-101M Tamura	FIXED IND 100UH 1.8A 190 MOHM	0
	TO1608-150M Tamura	FIXED IND 15UH 1A 230 MOHM SMD	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