High-temperature thyristors improve thermal management

10th January 2020
Alex Lynn

Littelfuse has announced an additional five series of high-temperature Alternistor TRIAC switching thyristors. The thyristors are designed for use as semiconductor switches in appliances and equipment powered by line AC voltages up to 250VRMS.

Available in five compact, surface-mount and through-hole packages, these components expand the Littelfuse TRIAC product line by making high 150°C maximum junction temperature devices available in 600 to 800V with ratings of 12, 16, 25, 30 and 40A.

This combination of high temperature capabilities, space-saving packaging and choice of current ratings makes them well-suited for Internet of Things (IoT) smart home applications that require compact design but don’t involve continuous high currents. 

The high-temperature Alternistor TRIACs include these benefits:

  • Easier thermal management, especially in application with limited or no heat sinking.
  • Mechanically and thermally robust clip-attach packages offer higher field reliability.
  • Enables designers to use smaller board sizes in low power applications.
  • Ensures higher surge capability to withstand short-duration overload conditions.

Koichiro Yoshimoto, Business Development Manager, Semiconductor Business Unit at Littelfuse, said: “The combination of the robust clip-attach assembly design and the maximum operating junction temperature ensures the high surge capability needed to withstand short-duration overload conditions.

“This important extension to our TRIAC product portfolio opens the door for product designers to include 250V AC applications with current ratings up to 40A. By offering more current rating choices in a variety of surface-mount packages utilising our clip-attach assembly, design engineers now have the freedom to minimise board sizes for low power applications, while also ensuring excellent field reliability and longer product life.”

High-temperature TRIACs are available in these popular packages: TO-220AB, TO-220 Isolated, TO-263 (D2-PAK), TO-218 Isolated (TOP3 Ins) and TO-218X Isolated with loop leads.

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