STMICROELECTRONICS Thyristor, 200V, 200uA, SOT-23, 3 Pin

The STMICROELECTRONICS P0102BL 5AA4 is a standard sensitive Silicon Controlled Rectifier (SCR) designed for highly sensitive triggering. It is engineered for applications where available gate current is limited, making it an essential component in sensitive electronic circuits and safety devices.

This thyristor features a robust SOT-23 surface-mount package, ensuring compatibility with modern, compact PCB designs. Its key characteristic is the exceptionally low gate trigger current, ranging from 5 to 200µA, which allows it to be activated with minimal control signal strength. This high sensitivity is crucial for energy-efficient designs and circuits powered by low-current sources.

With a peak repetitive off-state voltage of 200V, an average on-state current of 160mA, and an RMS on-state current of 250mA, it handles a variety of low to medium-power switching tasks reliably. It also boasts a peak non-repetitive surge current capability of 7A, providing good resilience against short-duration overloads.

Typical Applications

The device is ideally suited for:

• Ground fault circuit interrupters (GFCIs) for enhanced electrical safety.
• Pilot circuits within solid-state relays, enabling precise control.
• Smoke and alarm detector circuits, where reliable, low-power switching is paramount.
• General use in power management and sensing instrumentation systems.

With a maximum operating temperature of 125°C and a compact form factor, this thyristor delivers reliable performance in space-constrained, demanding environments. It is a fundamental component for designers seeking a sensitive, surface-mount switching solution for protection and control applications.