NTE5645 10 amp triac , isolated tab
The NTE5645 is an 10 Amp TRIAC in a TO220 type package designed to be driven directly with IC and MOS devices and features proprietary, void–free glass passivated chips. This device is a bi–directional triode thyristor and may be switched from off–state to conduction for either polarity of applied voltage with positive or negative gate trigger current. The NTE5645 is designed for control applications in lighting, heating, cooling and static switching relays.
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Image for illustrative purpose only

Manufacturer datasheet - NTE5645 (Adobe Reader required to read datasheet)