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TRIAC boasts motor control at 150C

Posted: 30 Jun 2009 ?? ?Print Version ?Bookmark and Share

Keywords:TRIAC? triodes? motor control? power supply?


STMicroelectronics has introduced what it claims to be the first triodes for alternating current (TRIACs) with 10mA gate sensitivity to be specified for operation up to 150C without derating. The devices reduce the need for heat sinks, gate-drive power-supply and snubber circuitry, thus lowering BOM cost. It is targeted for heaters, motors and other small appliances.

The devices introduced are the T410H rated for maximum current of 4A, the 6A T610H, 8A T810H and 10A T1010H. They extend ST's family of HiTj TRIACs, first launched in February 2008 with devices having gate sensitivities of 35mA and 50mA, and current ratings up to 20A.

The current 10mA low gate current allows direct logic-level switching of the TRIAC. This saves component count and reduces the size and cost of the power supply. This also maintains high dynamic performance, maintaining specified minimal commutation and 75V/ms noise immunity at up to 150C. This high maximum junction temperature (Tj) allows designers to reduce or remove heat sinks in cost-sensitive designs, increase power density, and enhance reliability at high ambient temperatures.

The new TRIACs are ideal for control of AC loads in electric heaters, inductive heating equipment, medium-power motors, and other small appliances. At normal operating temperatures, they exceed the performance of similar devices specified for 125C maximum Tj. All devices are rated up to 600V, for reliable operation in mains-powered systems.

All devices are available in the industry-standard TO-220AB through-hole package, and the T810H and T1010H will also be introduced in the surface-mount D2PAK package. The T410H, T610H, T810H and T1010H are in volume production, priced from $0.40 in quantities of 10,000 pieces.

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