The JST25Z08-BW is a two-way triac thyristor with a maximum voltage rating of 800V in a TO-3P RoHS housing produced by Haoruijia. It is primarily designed to control the current flow and resist the flow of voltage in applications such as motor control, light dimming and AC switching. It is a reverse blocking thyristor, meaning that it restricts current flow from anode to cathode, and when enabled will allow current flow from cathode to anode. It is suitable for zero crossing applications as it begins to conduct only when voltages on each electrode reaches a certain level. This thyristor can be triggered with a short pulse, and can be triggered in either direction. It is also robust to voltages surges and pulse noise, and can tolerate transient voltages with a peak of 25V.