BT151-500R – NXP

The NXP BT151-500R is a sensitive gate silicon controlled rectifier (SCR) specifically designed for direct interfacing with low-power logic circuits and microcontrollers. It boasts a repetitive peak off-state voltage (VDRM/VRRM) of 500V, enabling its use in mains-connected applications and high-voltage switching. Its on-state RMS current rating (IT(RMS)) is 7.5A, allowing control of moderately sized inductive and resistive loads. This thyristor is supplied in a robust and easily mountable through-hole TO-220AB package. The BT151-500R operates reliably across an ambient temperature range of –40°C to 125°C. Its sensitivity allows for direct triggering from logic-level signals, eliminating the need for complex driver stages and simplifying circuit design. Common use cases include phase control in light dimmers, motor speed control, and over-voltage protection circuits where a rapid and reliable switching action is paramount. Its high blocking voltage and sensitive gate make it a versatile and cost-effective solution for numerous power control applications.