Fixed Inductors

Part Number	Description / PDF	Quantity
TCK-148 TRACO Power	FIXED IND 82UH 250MA 2.8OHM SMD	0
TCK-047 TRACO Power	FIXED IND 10UH 1.44A 100MOHM SMD	0
TCK-141 TRACO Power	FIXED IND 5.6UH 3.5A 90MOHM SMD	312
TCK-155 TRACO Power	FIXED IND 39UH 500MA 1OHM SMD	0
TCK-130 TRACO Power	FIXED IND 22UH 580MA 55MOHM SMD	0
TCK-071 TRACO Power	FIXED IND 18UH 1.8A 100MOHM SMD	20
TCK-131 TRACO Power	FIXED IND 15UH 850MA 235MOHM SMD	106
TCK-151 TRACO Power	FIXED IND 4.7UH 1.5A 150MOHM SMD	107
TCK-146 TRACO Power	FIXED IND 10UH 1A 350MOHM SMD	0
TCK-160 TRACO Power	FIXED IND 3.9UH 2A 70MOHM SMD	0
TCK-133 TRACO Power	FIXED IND 68UH 370MA 1.117OHM SM	101
TCK-102 TRACO Power	FIXED IND 3.3UH 10A 18 MOHM SMD	180
TCK-132 TRACO Power	FIXED IND 22UH 680MA 378MOHM SMD	0
TCK-121 TRACO Power	FIXED IND 15UH 700MA 570MOHM SMD	26
TCK-129 TRACO Power	FIXED IND 6.8UH 900MA 132MOHM SM	92
TCK-098 TRACO Power	FIXED IND 22UH 1.5A 110MOHM SMD	71
TCK-108 TRACO Power	FIXED IND 3.3UH 3.3A 50MOHM SMD	96
TCK-063 TRACO Power	FIXED IND 27UH 970MA 200MOHM SMD	126
TCK-147 TRACO Power	FIXED IND 15UH 600MA 600MOHM SMD	0
TCK-145 TRACO Power	FIXED IND 6.8UH 1A 300MOHM 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