The BT139-800,127 is a 630V, 800mA, Linear Triacs from NXP. It is a sensitive, reverse triggering, Surface Mount, bidirectional Thyristor, suitable for general purpose AC switching applications. The BT139-800,127 has low turn-on, low off-state and gate trigger currents, as well as high frequency performance. It is also temperature compensated and has a temperature-resistant design. The BT139-800,127 is RoHS compliant and is available in an SMD package.