ST’s High-Temperature Snubberless 8H Triacs Save Space and Boost Reliability

Semiconductor specialist STMicroelectronics said that its 800V 8H Triacs operate at full rated current up to the maximum junction temperature of 150°C, allowing heatsinks in drives for AC loads to be up to 50 per cent smaller to combine compact dimensions with high reliability.

February 01, 2021. By Manu Tayal

Semiconductor specialist STMicroelectronics said that its 800V 8H Triacs operate at full rated current up to the maximum junction temperature of 150°C, allowing heatsinks in drives for AC loads to be up to 50 per cent smaller to combine compact dimensions with high reliability.

Suited to industrial, personal care, smart-home, and smart-building applications, the new Triacs leverage ST’s latest Snubberless™ high-temperature technology to achieve their outstanding ruggedness.

With low on-state voltage (VTM), which ensures high operating efficiency and minimizes self-heating, the devices also have low leakage current that is stable over time to reduce standby losses. In addition, robust dynamic performance with high critical turn-off current slope prevents unwanted commutation.

Capable of safely driving inductive loads, the 8H Triacs let designers create rugged and efficient controls for HVAC systems, AC-motor drives, water heaters, room heaters, lighting systems, home appliances, and smart AC plugs.

The complete 8H family spans current ratings from 8A to 30A. The peak off-state voltage of 800V ensures robust performance in AC-line-powered applications including 3-phase equipment operating from up to 400V RMS. The devices benefit from high noise immunity and can withstand voltage fast transients up to 6kV and voltage gradient (dV/dt) up to 2000V/µs across the full junction-temperature range.

ST’s 8H Triacs are in production now, in D2PAK, TO-220AB, and TO-220AB insulated packages, priced from USD 0.39 for orders of 1000 pieces. Further pricing options are available for larger quantities.

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