The STMicroelectronics TRIAC ACST435-8BTR is a four-amp, 800-volt thyristor designed for use in AC switching applications. It is housed in a DPAK package, which is a surface-mountable package with three leads. The TRIAC is a three-terminal semiconductor device that can be used to control the current in an AC circuit. It is a bidirectional device, meaning it can conduct current in either direction.

The ACST435-8BTR has a maximum on-state current of 4A and a maximum off-state voltage of 800V. It has a maximum gate trigger current of 5mA and a maximum gate trigger voltage of 1.5V. It has a maximum junction temperature of 150°C and a maximum storage temperature of -40°C to 150°C.

The ACST435-8BTR is suitable for use in a variety of applications, including motor control, lighting control, and heating control. It can be used to control the current in AC circuits, allowing for precise control of the current flow. It is also suitable for use in power supplies, AC switches, and other AC control applications.