ThomasNet News Logo
Sign Up | Log In | ThomasNet Home | Promote Your Business

Thyristor Power Control Devices expand usable range of lighting.

Print | 
Email |  Comment   Share  
Thyristor Power Control Devices expand usable range of lighting.
Thyristor Power Control Devices expand usable range of lighting.
Click Here to Enlarge Picture
March 15, 2013 - Alternistor Triac (Q6008LH1LED and Q6012LH1LED Series) and QUADRAC (Q6008LTH1LED and Q6012LTH1LED Series) Thyristor Power Control Devices are designed for use as switch in dimmer circuit to adjust light output of LED bulbs and strings. Products let designers of AC line-based dimmers for LED lighting accommodate range of operating parameters without reducing reliability or dimmer performance. Consequently, single control device can be used for LED-based dimmers or for combination dimmers.

Thyristor Power Control Devices from Littelfuse Expand Usable Range of Lighting Spectrum for LED, CFL, and Incandescent Loads

(Archive News Story - Products mentioned in this Archive News Story may or may not be available from the manufacturer.)

Littelfuse, Inc.
800 E. Northwest Hwy.
Des Plaines, IL, 60016

Press release date: March 7, 2013

Ensures robust switching performance for AC line based LED dimmer applications

CHICAGO — Littelfuse, Inc., the global leader in circuit protection, has introduced two new Alternistor Triac and two new QUADRAC Thyristor Power Control Devices. These devices are designed for use as the switch in a dimmer circuit to adjust the light output of Light Emitting Diode (LED) bulbs and strings. They allow designers of AC line based dimmers for LED lighting to accommodate a wide range of operating parameters without sacrificing reliability and without degrading the performance of the dimmer. As a result, a single control device can be used for LED-based dimmers or for combination dimmers designed for incandescent, compact fluorescent lamp (CFL), and LED loads.

“For the designers of environmental or theme lighting, the introduction of LED lighting has created some significant technical challenges. For example, these new lamps and strings have extremely low current draw, which causes traditional thyristors to turn off early, making it impossible to access one range of the lighting spectrum,” said Corey Deyalsingh, Product Director of the Littelfuse Thyristor Power Control Devices product line. “The low load current capability of these new thyristors makes it possible to create a single dimmer design that will cover all dimmable lighting loads: LEDs, CFLs, and traditional incandescents. The high rate of rise of current through these thyristors (di/dt) during turn-on and high junction temperature rating ensure greater reliability and design flexibility. Our new QUADRAC devices further simplify circuit design and assembly by combining a diac and a triac in a single package.”

The Alternistor Triacs (Q6008LH1LED and Q6012LH1LED Series) and QUADRACs (Q6008LTH1LED and Q6012LTH1LED Series) Thyristor Power Control Devices offer these key features and benefits:

• Max holding current as low as 6mA
• UL recognized TO-220AB package
• 110°C rated junction temperature
• Static dv/dt performance of 35V/µs
• di/dt performance of 70A/µs
• QUADRAC version includes integrated DIAC
• Gated Triacs have 10mA gate sensitivity

• Full control of light output at the extreme low end of load conditions
• 2500VAC min isolation between mounting tab and active terminals
• Improves margin of safe operation with less heat sinking required
• Provides enhanced immunity from electrical noise
• Enables survivability of typical LED load operating characteristics
• Simplicity of circuit design and layout
• 600 Volts blocking capability

Littelfuse Alternistor Triacs (Q6008LH1LED and Q6012LH1LED Series) and QUADRACs (Q6008LTH1LED and Q6012LTH1LED Series) are available in quantities of 500 in bulk and in tube packaging. Samples are available now for bulk orders; sample requests can be placed through authorized Littelfuse distributors worldwide. For a listing of Littelfuse distributors, please visit

For More Information
Additional information is available on the following product pages, including datasheets: 
• Q6008LH1LED and Q6012LH1LED Series Alternistor Triacs
• Q6008LTH1LED and Q6012LTH1LED Series QUADRACs

If you have technical questions, please contact: Corey Deyalsingh, Product Director, Littelfuse Thyristor Power Control Devices,

About Littelfuse
Founded in 1927, Littelfuse, Inc., the worldwide leader in circuit protection, offers the industry’s broadest and deepest portfolio of circuit protection products and solutions. Littelfuse devices protect products in virtually every market that uses electrical energy, from consumer electronics to automobiles to industrial equipment. In addition to its Chicago, Illinois, world headquarters, Littelfuse has more than 30 sales, distribution, manufacturing and engineering facilities in the Americas, Europe and Asia. Technologies offered by Littelfuse include Fuses; Gas Discharge Tubes (GDTs); Positive Temperature Coefficient Devices (PTCs); PulseGuard® ESD Suppressors; SIDACtor® Devices; Silicon Protection Arrays (SPA®); Switching Thyristors; TVS Diodes and Varistors. The company also offers a comprehensive line of highly reliable Electromechanical and Electronic Switch and Control Devices for commercial and specialty vehicles and Sensors for automobile safety systems, as well as Protection Relays and underground Power Distribution Centers for the safe control and distribution of electricity.

For more information, please visit the Littelfuse website:
Print | 
Email |  Comment   Share  
Contacts: View detailed contact information.


Post a comment about this story

(your e-mail address will not be posted)
Comment title:
To submit comment, enter the security code shown below and press 'Post Comment'.

 See related product stories
More .....
 See more product news in:
Electrical Equipment and Systems
Electronic Components and Devices
 More New Product News from this company:
TVS Diode Array protects fragile ICs from ESD.
TVS Diode Array protects differential data lines.
TVS Diode Arrays dissipate 8 A of induced surge current.
TVS Diode Array increases automotive electronics reliability.
IGBT and Rectifier Diode Modules come in diverse package designs.
More ....
| Featured Manufacturing Jobs
 Other News from this company:
Littelfuse Honors Arrow Electronics as Its 2013 Volume Distributor of the Year
Littelfuse Recognizes Digi-Key as High-Service/Catalog Distributor of the Year for Second Consecutive Year
Littelfuse Receives Global Supplier Excellence Honors from TTI
Littelfuse Receives 2013 Supplier of the Year Award for Asia-Pacific from Strategic Channel Provider, Arrow
Littelfuse Far East Receives 2013 Gold Supplier Excellence Award from TTI Asia
More ....
 Tools for you
Watch Company 
View Company Profile
Company web site
More news from this company
E-mail this story to a friend
Save Story
Search for suppliers of
Power Control Unit Thyristors
Dimmer Switches
Join the forum discussion at:
Tools of the Trade
Wired In

Home  |  My ThomasNet News®  |  Industry Market Trends®  |  Submit Release  |  Advertise  |  Contact News  |  About Us
Brought to you by        Browse ThomasNet Directory

Copyright © 2014 Thomas Publishing Company. All Rights Reserved.
Terms of Use - Privacy Policy

Error close

Please enter a valid email address