STM811SW16F

STM811SW16F is a microprocessor reset supervisor from STMicroelectronics in a 4-pin SOT-143 package. The S code fixes the reset threshold at 2.93 V, the push-pull output is active low, a manual reset input lets a pushbutton or system logic force a reset, and the reset pulse width is guaranteed to be at least 140 ms, across an operating range of -40 C to +85 C. For boards running from a nominal 3.3 V rail, that gives a compact, no-configuration safeguard against power-up and brown-out faults: the processor is held in reset until the supply is safely above the threshold and stays there for the defined pulse. Selection advice: choose the threshold letter that matches your supply rail - the S variant at 2.93 V fits 3.3 V systems - and note that the W16F code is the SOT-143 version supplied on tape and reel, 3000 pieces per reel, which differs from the SOT-23 versions in the same family. Parameters verified against STMicroelectronics documentation.